Transmitting method, receiving method, transmitting apparatus, and receiving apparatus

0Associated
Cases 
0Associated
Defendants 
0Accused
Products 
0Forward
Citations 
0
Petitions 
1
Assignment
First Claim
1. A transmission apparatus using Orthogonal Frequency Division Multiplexing (OFDM) comprising:
 a processor; and
a nontransitory memory coupled to the processor,wherein the processor performs;
configuring a first frame by allocating a resource to each of one or more stations, each resource including a subset of subcarriers; and
transmitting the first frame by using an antenna,wherein the first frame includes a first preamble, a second preamble, and a first data symbol, a subcarrier frequency spacing of the first preamble is a first frequency spacing value, a subcarrier frequency spacing of the second preamble is a second frequency spacing value, the first frequency spacing value is four times larger than the second frequency spacing value, a subcarrier spacing of the first data symbol is the second frequency spacing value, the first data symbol carries data for the one or more stations simultaneously, andwherein the first frequency spacing value is equal to a subcarrier frequency spacing of a second data symbol included in a second frame which is different from the first frame, data subcarriers used for data transmission in the second data symbol carries data for one station without dividing into resources.
1 Assignment
0 Petitions
Accused Products
Abstract
A transmitting method includes: configuring a frame using a plurality of orthogonal frequencydivision multiplexing (OFDM) symbols, by allocating time resources and frequency resources to a plurality of transmission data; and transmitting the frame, wherein the frame includes a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, and a second period in which the plurality of transmission data are transmitted by at least one of time division and frequency division, and among the plurality of OFDM symbols, OFDM symbols included in the second period include pilot symbols arranged along a time axis with a predetermined spacing therebetween, and a predetermined number of data symbols.
9 Citations
No References
POWERLINE COMMUNICATION METHOD, POWERLINE COMMUNICATION DEVICE, AND POWERLINE COMMUNICATION SYSTEM  
Patent #
US 20080304577A1
Filed 05/29/2008

Current Assignee
Panasonic Corporation

Sponsoring Entity
Panasonic Corporation

Method for adjusting FFT window positioning in MBOFDM UWB system  
Patent #
US 20070133392A1
Filed 12/07/2006

Current Assignee
Electronics and Telecommunications Research Institute

Sponsoring Entity
Electronics and Telecommunications Research Institute

WIRELESS TRANSCEIVER SYSTEM AND METHOD  
Patent #
US 20120321006A1
Filed 07/19/2012

Current Assignee
Toshiba Medical Systems Corporation

Sponsoring Entity
Toshiba Medical Systems Corporation

METHOD AND APPARATUS FOR ALLOCATING RESOURCES FOR UPLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM  
Patent #
US 20130044725A1
Filed 05/06/2011

Current Assignee
LG Electronics Inc.

Sponsoring Entity
LG Electronics Inc.

RECEIVER APPARATUS, RECEPTION METHOD, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD  
Patent #
US 20130308733A1
Filed 01/13/2012

Current Assignee
Sharp Electronics Corporation

Sponsoring Entity
Sharp Electronics Corporation

POWER LINE COMMUNICATIONS USING FRAME CONTROL DATA BLOCKS FOR DATA TRANSPORT  
Patent #
US 20140241441A1
Filed 02/24/2014

Current Assignee
Maxlinear Asia Singapore Pte Ltd.

Sponsoring Entity
Maxlinear Asia Singapore Pte Ltd.

SNR Dependent Channel Tracking For SUN OFDM  
Patent #
US 20140307841A1
Filed 12/31/2013

Current Assignee
Texas Instruments Inc.

Sponsoring Entity
Texas Instruments Inc.

SymbolWise Channel Tracking For SUN OFDM  
Patent #
US 20140307813A1
Filed 12/31/2013

Current Assignee
Texas Instruments Inc.

Sponsoring Entity
Texas Instruments Inc.

APPARATUS FOR TRANSMITTING BROADCAST SIGNALS, APPARATUS FOR RECEIVING BROADCAST SIGNALS, METHOD FOR TRANSMITTING BROADCAST SIGNALS AND METHOD FOR RECEIVING BROADCAST SIGNALS  
Patent #
US 20140314177A1
Filed 04/18/2014

Current Assignee
LG Electronics Inc.

Sponsoring Entity
LG Electronics Inc.

4 Claims
 1. A transmission apparatus using Orthogonal Frequency Division Multiplexing (OFDM) comprising:
a processor; and a nontransitory memory coupled to the processor, wherein the processor performs; configuring a first frame by allocating a resource to each of one or more stations, each resource including a subset of subcarriers; and transmitting the first frame by using an antenna, wherein the first frame includes a first preamble, a second preamble, and a first data symbol, a subcarrier frequency spacing of the first preamble is a first frequency spacing value, a subcarrier frequency spacing of the second preamble is a second frequency spacing value, the first frequency spacing value is four times larger than the second frequency spacing value, a subcarrier spacing of the first data symbol is the second frequency spacing value, the first data symbol carries data for the one or more stations simultaneously, and wherein the first frequency spacing value is equal to a subcarrier frequency spacing of a second data symbol included in a second frame which is different from the first frame, data subcarriers used for data transmission in the second data symbol carries data for one station without dividing into resources.
 2. A reception apparatus using Orthogonal Frequency Division Multiplexing (OFDM) comprising:
a processor; and a nontransitory memory coupled to the processor, wherein the processor performs; receiving a received signal obtained by receiving a first frame by using an antenna, the first frame being configured by allocating a resource to each of one or more stations, each resource including a subset of subcarriers, the first frame including a first preamble, a second preamble, and a first data symbol, a subcarrier frequency spacing of the first preamble being a first frequency spacing value, a subcarrier frequency spacing of the second preamble being a second frequency spacing value, the first frequency spacing value being four times larger than the second frequency spacing value, a subcarrier spacing of the first data symbol being the second frequency spacing value, the first data symbol carrying data for the one or more stations simultaneously; and demodulating the received signal, wherein the demodulating the received signal includes; obtaining a first control information carried in the first preamble using a Fast Fourier Transform (FFT) according to the first frequency spacing; obtaining a second control information carried in the first preamble using a Fast Fourier Transform (FFT) according to the second frequency spacing; and obtaining a data carried in the first data symbol using a Fast Fourier Transform (FFT) according to the second frequency spacing, and wherein the first frequency spacing value is equal to a subcarrier frequency spacing of a second data symbol included in a second frame which is different from the first frame, data subcarriers used for data transmission in the second data symbol carries data for one station without dividing into resources.
 3. A transmission method using Orthogonal Frequency Division Multiplexing (OFDM) comprising:
configuring a first frame by allocating a resource to each of one or more stations, each resource including a subset of subcarriers; and transmitting the first frame by using an antenna, wherein the first frame includes a first preamble, a second preamble, and a first data symbol, a subcarrier frequency spacing of the first preamble is a first frequency spacing value, a subcarrier frequency spacing of the second preamble is a second frequency spacing value, the first frequency spacing value is four times larger than the second frequency spacing value, a subcarrier spacing of the first data symbol is the second frequency spacing value, the first data symbol carries data for the one or more stations simultaneously, and wherein the first frequency spacing value is equal to a subcarrier frequency spacing of a second data symbol included in a second frame which is different from the first frame, data subcarriers used for data transmission in the second data symbol carries data for one station without dividing into resources.
 4. A reception method using Orthogonal Frequency Division Multiplexing (OFDM) comprising:
receiving a received signal obtained by receiving a first frame, the first frame being configured by allocating a resource to each of one or more stations, each resource including a subset of subcarriers, the first frame including a first preamble, a second preamble, and a first data symbol, a subcarrier frequency spacing of the first preamble being a first frequency spacing value, a subcarrier frequency spacing of the second preamble being a second frequency spacing value, the first frequency spacing value being four times larger than the second frequency spacing value, a subcarrier spacing of the first data symbol being the second frequency spacing value, the first data symbol carrying data for the one or more stations simultaneously; and demodulating the received signal, wherein the demodulating the received signal includes; obtaining a first control information carried in the first preamble using a Fast Fourier Transform (FFT) according to the first frequency spacing; obtaining a second control information carried in the first preamble using a Fast Fourier Transform (FFT) according to the second frequency spacing; and obtaining a data carried in the first data symbol using a Fast Fourier Transform (FFT) according to the second frequency spacing, and wherein the first frequency spacing value is equal to a subcarrier frequency spacing of a second data symbol included in a second frame which is different from the first frame, data subcarriers used for data transmission in the second data symbol carries data for one station without dividing into resources.
1 Specification
The present invention relates to a transmitting method, a receiving method, a transmitting apparatus and a receiving apparatus.
The DVBT2 standard is an example of a digital broadcasting standard in which orthogonal frequency division multiplexing (OFDM) is used (see NonPatent Literature (NPL) 5).
In digital broadcasting according to, for instance, the DVBT2 standard, a frame in which a plurality of data streams are multiplexed by time division is configured, and data is transmitted on a framebyframe basis.
 NPL 1: R. G. Gallager, “Lowdensity paritycheck codes,” IRE Trans. Inform. Theory, IT8, pp. 2128, 1962.
 NPL 2: “Performance analysis and design optimization of LDPCcoded MIMO OFDM systems” IEEE Trans. Signal Processing, vol. 52, no. 2, pp. 348361, February 2004.
 NPL 3: C. Douillard, and C. Berrou, “Turbo codes with rate −m/(m+1) constituent convolutional codes,” IEEE Trans. Commun., vol. 53, no. 10, pp. 16301638, October 2005.
 NPL 4: C. Berrou, “The tenyearold turbo codes are entering into service,” IEEE Communication Magazine, vol. 41, no. 8, pp. 110116, August 2003.
 NPL 5: DVB Document A122, Frame structure, channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVBT2), June 2008.
 NPL 6: D. J. C. Mackay, “Good errorcorrecting codes based on very sparse matrices,” IEEE Trans. Inform. Theory, vol. 45, no. 2, pp 399431, March 1999.
 NPL 7: S. M. Alamouti, “A simple transmit diversity technique for wireless communications,” IEEE J. Select. Areas Commun., vol. 16, no. 8, pp. 14511458, October 1998.
 NPL 8: V. Tarokh, H. Jafrkhani, and A. R. Calderbank, “Spacetime block coding for wireless communications: Performance results,” IEEE J. Select. Areas Commun., vol. 17, no. 3, no. 3, pp. 451460, March 1999.
The nonlimiting exemplary embodiments of the present disclosure provide a transmitting method, a receiving method, a transmitting apparatus, and a receiving apparatus which allow communication using a flexible frame configuration.
A transmitting method according to an aspect of the present disclosure is a transmitting method executed by a transmitting apparatus which transmits a plurality of transmission data using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: configuring a frame by allocating time resources and frequency resources to the plurality of transmission data; and transmitting the frame. When configuring a frame, the frame is configured so as to include a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division.
In the transmitting method, when configuring a frame, in the fourth period, the frame may be configured so as to include a time at which first transmission data and second transmission data are transmitted by frequency division, and a frequency at which the first transmission data and third transmission data are transmitted by time division.
A receiving method according to an aspect of the present disclosure is a receiving method executed by a receiving apparatus which receives a plurality of transmission data transmitted using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: receiving a frame in which time resources and frequency resources are allocated to the plurality of transmission data such that the frame includes a first period in which a preamble is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division; obtaining information on a frame configuration of the frame from the preamble; and demodulating, based on the information on the frame configuration, at least one of the plurality of transmission data transmitted in the second period, the plurality of transmission data transmitted in the third period, and the plurality of transmission data transmitted in the fourth period.
In the receiving method, when receiving a frame, in the fourth period, a frame may be received, the frame being configured to include a time at which first transmission data and second transmission data are transmitted by frequency division, and a frequency at which the first transmission data and third transmission data are transmitted by time division.
A transmitting apparatus according to an aspect of the present disclosure is a transmitting apparatus which transmits a plurality of transmission data using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: a frame configuring unit configured to configure a frame by allocating time resources and frequency resources to the plurality of transmission data; and a transmitter which transmits the frame. The frame configuring unit is configured to configure a frame such that the frame includes a first period in which a preamble which includes information on a frame configuration of the frame is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division.
In the transmitting apparatus, in the fourth period, the frame configuring unit may be configured to configure a frame such that the frame includes a time at which first transmission data and second transmission data are transmitted by frequency division, and a frequency at which the first transmission data and third transmission data are transmitted by time division.
A receiving apparatus according to an aspect of the present disclosure is a receiving apparatus which receives a plurality of transmission data transmitted using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: a receiver which receives a frame in which time resources and frequency resources are allocated to the plurality of transmission data such that the frame includes a first period in which a preamble is transmitted, a second period in which a plurality of transmission data are transmitted by time division, a third period in which a plurality of transmission data are transmitted by frequency division, and a fourth period in which a plurality of transmission data are transmitted by time division and frequency division; a preamble processor which obtains information on a frame configuration of the frame from the preamble; and a demodulator which demodulates, based on the information on the frame configuration, at least one of the plurality of transmission data transmitted in the second period, the plurality of transmission data transmitted in the third period, and the plurality of transmission data transmitted in the fourth period.
In the receiving apparatus, in the fourth period, the receiver may receive a frame configured so as to include a time at which first transmission data and second transmission data are transmitted by frequency division, and a frequency at which the first transmission data and third transmission data are transmitted by time division.
A transmitting method according to an aspect of the present disclosure is a transmitting method executed by a transmitting apparatus which transmits a plurality of transmission data using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: configuring a frame by allocating time resources and frequency resources to the plurality of transmission data; and transmitting the frame. When configuring a frame, a frame is configured, the frame including a first area in which a preamble that includes information on a frame configuration of the frame is arranged, a second area in which a plurality of transmission data are arranged by time division, a third area in which a plurality of transmission data are arranged by frequency division, and a fourth area in which a plurality of transmission data are arranged by time division and frequency division.
A receiving method according to an aspect of the present disclosure is a receiving method executed by a receiving apparatus which receives a plurality of transmission data transmitted using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: receiving a frame which includes a first area in which a preamble is arranged, a second area in which a plurality of transmission data are arranged by time division, a third area in which a plurality of transmission data are arranged by frequency division, and a fourth area in which a plurality of transmission data are arranged by time division and frequency division; obtaining information on a frame configuration of the frame from the preamble; and demodulating, based on the information on the frame configuration, at least one of the plurality of transmission data transmitted in the second area of the frame, the plurality of transmission data transmitted in the third area of the frame, and the plurality of transmission data transmitted in the fourth area of the frame.
A transmitting apparatus according to an aspect of the present disclosure is a transmitting apparatus which transmits a plurality of transmission data using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: a frame configuring unit configured to configure a frame by allocating time resources and frequency resources to the plurality of transmission data; and a transmitter which transmits the frame. The frame configuring unit is configured to configure a frame which includes a first area in which a preamble that includes information on a frame configuration of the frame is arranged, a second area in which a plurality of transmission data are arranged by time division, a third area in which a plurality of transmission data are arranged by frequency division, and a fourth area in which a plurality of transmission data are arranged by time division and frequency division
A receiving apparatus according to an aspect of the present disclosure is a receiving apparatus which receives a plurality of transmission data transmitted using an orthogonal frequencydivision multiplexing (OFDM) method, and includes: a receiver which receives a frame which includes a first area in which a preamble is arranged, a second area in which a plurality of transmission data are arranged by time division, a third area in which a plurality of transmission data are arranged by frequency division, and a fourth area in which a plurality of transmission data are arranged by time division and frequency division; a preamble processor which obtains information on a frame configuration of the frame from the preamble; and a demodulator which demodulates, based on the information on the frame configuration, at least one of the plurality of transmission data transmitted in the second area of the frame, the plurality of transmission data transmitted in the third area of the frame, and the plurality of transmission data transmitted in the fourth area of the frame.
Such general and particular aspects may be achieved by arbitrary combinations of systems, apparatuses, and methods.
According to the transmitting apparatus, the receiving apparatus, the transmitting method, and the receiving method according to the present disclosure, communication can be performed using a flexible frame configuration. This yields advantageous effects that high efficiency in data transmission can be achieved in a communications system and furthermore the receiving apparatus can efficiently obtain data.
Further advantages and advantageous effects according to aspects of the present disclosure are clarified from the Specification and the drawings. Such advantages and/or advantageous effects are achieved by some exemplary embodiments and features described in the Specification and illustrated in the drawings, yet not all the features are necessarily provided in order to obtain one or more features equivalent to the features described and illustrated.
(Spatial Multiplexing MIMO Method)
Conventionally, as a communication method using a multiantenna, for example, there is a communication method which is referred to as MIMO (MultipleInput MultipleOutput).
In multiantenna communication which is typically MIMO, data reception quality and/or a data communication rate (per unit time) can be enhanced by modulating transmission data of one or more sequences and simultaneously transmitting the respective modulated signals from different antennas by using the same frequency (common frequency).
The transmitting apparatus has a signal generator and a wireless processor. The signal generator performs communication channel coding on data, performs MIMO precoding processing, and generates two transmission signals z1(t) and z2(t) which can be transmitted simultaneously by using the same frequency (common frequency). The wireless processor multiplexes individual transmission signals in a frequency direction as necessary, that is, converts the transmission signals into multicarriers (for example, an OFDM (Orthogonal Frequency Division Multiplexing) method), and also inserts a pilot signal for estimation by a receiving apparatus of a transmission channel distortion, a frequency offset, a phase distortion and the like. (However, the pilot signal may estimate other distortions and the like, and the receiving apparatus may also use the pilot signal for signal detection. Note that a mode of using the pilot signal in the receiving apparatus is not limited to this mode.) The two transmitting antennas use the two transmitting antennas (TX1 and TX2) to transmit z1(t) and z2(t).
The receiving apparatus includes the receiving antennas (RX1 and RX2), a wireless processor, a channel fluctuation estimator and a signal processor. The receiving antenna (RX1) receives signals transmitted from the two transmitting antennas (TX1 and TX2) of the transmitting apparatus. The channel fluctuation estimator estimates a channel fluctuation value by using a pilot signal, and supplies a channel fluctuation estimation value to the signal processor. The signal processor restores data contained in z1(t) and z2(t) based on channel values estimated as signals received at the two receiving antennas, and obtains the data as one piece of received data. However, the received data may be a hard determination value of “0” or “1” or may be a soft determination value such as log likelihood or a log likelihood ratio.
Moreover, various coding methods such as turbo codes (for example, DuoBinary Turbo codes) and LDPC (LowDensity ParityCheck) codes are used as coding methods (NPLs 1 to 6 and the like).
Data generator 102 receives an input of transmission data 10801, and control signal 109. Data generator 102 performs error correction coding and mapping which is based on a modulating method, based on information such as information of error correction coding contained in control signal 109 and information of the modulating method contained in control signal 109. Data generator 102 outputs data transmission (quadrature) baseband signal 103.
Second preamble generator 105 receives an input of second preamble transmission data 104, and control signal 109. Second preamble generator 105 performs error correction coding and mapping which is based on a modulating method, based on information such as information of error correction of a second preamble contained in control signal 109 and information of the modulating method contained in control signal 109. Second preamble generator 105 outputs second preamble (quadrature) baseband signal 106.
Control signal generator 108 receives an input of first preamble transmission data 107, and second preamble transmission data 104. Control signal generator 108 outputs as control signal 109 information of a method for transmitting each symbol (a selected transmitting method including an error correction code, a coding rate of the error correction code, a modulating method, a block length, a frame configuration and a transmitting method for regularly switching precoding matrices, a method for inserting a pilot symbol, information or the like of IFFT (Inverse Fast Fourier Transform) (or inverse Fourier transform)/FFT (Fast Fourier Transform) (or Fourier transform), information of a method for reduction a PAPR (Peak to Average Power Ratio) and information of a method for inserting a guard interval).
Frame configuring unit 110 receives an input of data transmission (quadrature) baseband signal 103, second preamble (quadrature) baseband signal 106, and control signal 109. Frame configuring unit 110 performs rearrangement in a frequency axis and a time axis based on information of a frame configuration contained in the control signal. Frame configuring unit 110 outputs (quadrature) baseband signal 111_1 of stream 1 according to the frame configuration (a signal obtained after mapping, that is, a baseband signal based on a modulating method to be used), and (quadrature) baseband signal 111_2 of stream 2 according to the frame configuration (a signal obtained after mapping, that is, a baseband signal based on a modulating method to be used).
Signal processor 112 receives an input of baseband signal 111_1 of stream 1, baseband signal 111_2 of stream 2, and control signal 109. Signal processor 112 outputs modulated signal 1 (113_1) obtained after signal processing based on a transmitting method contained in control signal 109 and modulated signal 2 (113_2) obtained after the signal processing based on a transmitting method contained in control signal 109.
Note that in the signal processor, for example, an MIMO transmitting method using precoding and phase change (the MIMO transmitting method may also be an MIMO transmitting method which does not perform phase change) (referred to as an MIMO method here), an MISO (MultipleInput SingleOutput) transmitting method using space time block codes (space frequency block codes) (referred to as an MISO method here), and an SISO (SingleInput SingleOutput) (or SIMO (SingleInput MultipleOutput)) transmitting method for transmitting a modulated signal of one stream from one antenna (however, there is also a case where a modulated signal of one stream is transmitted from a plurality of antennas in the SISO method and the SIMO method). An operation of signal processor 112 will be described in detail below.
Pilot insertion unit 114_1 receives an input of modulated signal 1 (113_1) obtained after signal processing, and control signal 109. Pilot insertion unit 114_1 inserts a pilot symbol to modulated signal 1 (113_1) obtained after the signal processing, based on information contained in control signal 109 and related to a method for inserting the pilot symbol. Pilot insertion unit 114_1 outputs modulated signal 115_1 obtained after the pilot symbol insertion.
Pilot insertion unit 114_2 receives an input of modulated signal 2 (113_2) obtained after signal processing, and control signal 109. Pilot insertion unit 114_2 inserts a pilot symbol to modulated signal 2 (113_2) obtained after the signal processing, based on information contained in control signal 109 and related to a method for inserting the pilot symbol. Pilot insertion unit 114_2 outputs modulated signal 115_2 obtained after the pilot symbol insertion.
IFFT (Inverse Fast Fourier Transform) unit 116_1 receives an input of modulated signal 115_1 obtained after the pilot symbol insertion, and control signal 109. IFFT unit 116_1 performs IFFT based on information of an IFFT method contained in control signal 109. IFFT unit 116_1 outputs signal 117_1 obtained after the IFFT.
IFFT unit 116_2 receives an input of modulated signal 115_2 obtained after the pilot symbol insertion, and control signal 109. IFFT unit 116_2 performs IFFT based on information of the IFFT method contained in control signal 109. IFFT unit 116_2 outputs signal 117_2 obtained after the IFFT.
PAPR reduction unit 118_1 receives an input of signal 117_1 obtained after the IFFT, and control signal 109. PAPR reduction unit 118_1 performs processing for PAPR reduction on signal 117_1 obtained after the IFFT based on information contained in control signal 109 and related to the PAPR reduction. PAPR reduction unit 118_1 outputs signal 119_1 obtained after the PAPR reduction.
PAPR reduction unit 118_2 receives an input of signal 117_2 obtained after the IFFT, and control signal 109. PAPR reduction unit 118_2 performs processing for PAPR reduction on signal 117_2 obtained after the IFFT based on information contained in control signal 109 and related to the PAPR reduction. PAPR reduction unit 118_2 outputs signal 119_2 obtained after the PAPR reduction.
Guard interval insertion unit 120_1 receives an input of signal 119_1 obtained after the PAPR reduction, and control signal 109. Guard interval insertion unit 120_1 inserts a guard interval to signal 119_1 obtained after the PAPR reduction, based on information contained in control signal 109 and related to a guard interval insertion method. Guard interval insertion unit 120_1 outputs signal 121_1 obtained after the guard interval insertion.
Guard interval insertion unit 120_2 receives an input of signal 119_2 obtained after the PAPR reduction, and control signal 109. Guard interval insertion unit 120_2 inserts a guard interval to signal 119_2 obtained after the PAPR reduction, based on information contained in control signal 109 and related to a guard interval insertion method. Guard interval insertion unit 120_2 outputs signal 121_2 obtained after the guard interval insertion.
First preamble insertion unit 122 receives an input of signal 121_1 obtained after the guard interval insertion, signal 121_2 obtained after the guard interval insertion, and first preamble transmission data 107. First preamble insertion unit 122 generates a first preamble signal from first preamble transmission data 107. First preamble insertion unit 122 adds the first preamble to signal 121_1 obtained after the guard interval insertion. First preamble insertion unit 122 adds the first preamble to signal 123_1 obtained after the addition of the first preamble, and signal 121_2 obtained after the guard interval insertion. First preamble insertion unit 122 outputs signal 123_2 obtained after the addition of the first preamble. Note that the first preamble signal may be added to both of signal 123_1 obtained after the addition of the first preamble and signal 123_2 obtained after addition of the first preamble, and also may be added to any one of signal 123_1 obtained after the addition of the first preamble and signal 123_2 obtained after addition of the first preamble. When the first preamble signal is added to one of signal 123_1 and signal 123_2, the signal to which the first preamble is not added includes a zero signal as a baseband signal in a section in which the signal to which the first preamble is added is added.
Wireless processor 124_1 receives an input of signal 123_1 obtained after the addition of the first preamble. Wireless processor 124_1 performs processing such as frequency conversion and amplification on signal 123_1. Wireless processor 124_1 outputs transmission signal 125_1. Then, transmission signal 125_1 is output as a radio wave from antenna 126_1.
Wireless processor 124_2 receives an input of signal 123_2 obtained after the addition of the first preamble. Wireless processor 124_2 performs processing such as frequency conversion and amplification on signal 123_2. Wireless processor 124_2 outputs transmission signal 125_2. Then, transmission signal 125_2 is output as a radio wave from antenna 126_2.
Note that in the present exemplary embodiment, the MIMO transmitting method using precoding and phase change, the MISO (MultipleInput SingleOutput) transmitting method using space time block codes (or space frequency block codes) and the SISO (SingleInput SingleOutput) (or SIMO (SingleInput SingleOutput)) transmitting method are used as described above (details will be described below).
First, the data symbol groups will be described.
A data symbol group may be allocated per video/audio stream. For example, symbols for transmitting a first video/audio stream are of data symbol group #1 (203), symbols for transmitting a second video/audio stream are of data symbol group #2 (204), and symbols for transmitting a third video/audio stream are of data symbol group #3 (205). This point is not limited to
Moreover, for example, PLP (Physical Layer Pipe) in a standard such as DVBT2 (a second generation digital terrestrial television broadcasting system) may also be referred to as a data symbol group. That is, in
First preamble 201 and second preamble 202 include, for example, a symbol for performing frequency synchronization and time synchronization (for example, a PSK (Phase Shift Keying) symbol having signal point arrangement in an inphase Iquadrature Q plane known in the transmitting apparatus and the receiving apparatus), a pilot symbol for estimation by the receiving apparatus of a channel fluctuation (for example, a PSK (Phase Shift Keying) symbol having signal point arrangement in an inphase Iquadrature Q plane known in the transmitting apparatus and the receiving apparatus), a symbol for transmitting method information of each data symbol group (information for identifying the SISO method, the MISO method and the MIMO method), a symbol for transmitting information related to an error correction code of each data symbol group (for example, a code length and a coding rate), a symbol for transmitting information related to a method for modulating each data symbol (in a case of the MISO method or the MIMO method, since there is a plurality of streams, a plurality of modulating methods is specified), a symbol for transmitting method information of the first and second preambles, a symbol for transmitting information related to an error correction code of the first and second preambles, a symbol for transmitting information related to a method for modulating the first and second preambles, a symbol for transmitting information related to a method for inserting a pilot symbol, and a symbol for transmitting information related to a method for suppressing a PAPR. This point is not limited to
Characteristic points in
Note that in
Next,
Characteristic points in
In such a case, for example, a video/audio to be transmitted with data symbol group #1 and a video/audio to be transmitted with data symbol group #2 are different in coding compressibility of a video/audio, but may be the same “video/audio.” In this way, there is an advantage that the receiving apparatus can obtain a desired “video/audio” with high quality by a method as simple as selecting “whether to demodulate data symbol group #1 or demodulate data symbol group #2,” and that since a preamble can be made common in this case, control information transmission efficiency can be enhanced.
(However, contrarily, the video/audio to be transmitted with data symbol group #1 and the video/audio to be transmitted with data symbol #2 may be different).
Moreover, it becomes easy to make the transmitting method for transmitting data symbol group #1 the same as a transmitting method for transmitting data symbol group #2, and to make a transmitting method for transmitting data symbol group #3 different from the transmitting method for transmitting data symbol group #1 (the transmitting method for transmitting data symbol group #2).
(Although described below, a pilot symbol is inserted to a data symbol group. In this case, a pilot symbol inserting method is different per transmitting method (since a number of modulated signals to be transmitted may be different). Consequently, when a data symbol group is gathered per transmitting method, there is a possibility that a decrease in transmission efficiency owing to insertion of the pilot symbol can be prevented).
Next,
Characteristic points in
Next,
Characteristic points in
In addition, characteristic points in
In such a case, for example, a video/audio to be transmitted with data symbol group #1 and a video/audio to be transmitted with data symbol group #2 are different in coding compressibility of a video/audio, but may be the same “video/audio.” In this way, there is an advantage that the receiving apparatus can obtain a desired “video/audio” with high quality by a method as simple as selecting “whether to demodulate data symbol group #1 or demodulate data symbol group #2,” and that since a preamble can be made common in this case, control information transmission efficiency can be enhanced.
(However, contrarily, the video/audio to be transmitted with data symbol group #1 and the video/audio to be transmitted with data symbol #2 may be different).
Moreover, it becomes easy to make the transmitting method for transmitting data symbol group #1 the same as a transmitting method for transmitting data symbol group #2, and to make a transmitting method for transmitting data symbol group #3 different from the transmitting method for transmitting data symbol group #1 (the transmitting method for transmitting data symbol group #2).
(Although described below, a pilot symbol is inserted to a data symbol group. In this case, a pilot symbol inserting method is different per transmitting method (since a number of modulated signals to be transmitted may be different). Consequently, when a data symbol group is gathered per transmitting method, there is a possibility that a decrease in transmission efficiency owing to insertion of the pilot symbol can be prevented).
Next,
Characteristic points in
In addition, characteristic points in
In such a case, for example, a video/audio to be transmitted with data symbol group #1 and a video/audio to be transmitted with data symbol group #2 are different in coding compressibility of a video/audio, but may be the same “video/audio.” In this way, there is an advantage that the receiving apparatus can obtain a desired “video/audio” with high quality by a method as simple as selecting “whether to demodulate data symbol group #1 or demodulate data symbol group #2,” and that since a preamble can be made common in this case, control information transmission efficiency can be enhanced.
(However, contrarily, the video/audio to be transmitted with data symbol group #1 and the video/audio to be transmitted with data symbol #2 may be different).
Moreover, it becomes easy to make the transmitting method for transmitting data symbol group #1 the same as a transmitting method for transmitting data symbol group #2, and to make a transmitting method for transmitting data symbol group #3 different from the transmitting method for transmitting data symbol group #1 (the transmitting method for transmitting data symbol group #2).
(Although described below, a pilot symbol is inserted to a data symbol group. In this case, a pilot symbol inserting method is different per transmitting method. Consequently (since a number of modulated signals to be transmitted may be different), when a data symbol group is gathered per transmitting method, there is a possibility that a decrease in transmission efficiency owing to insertion of the pilot symbol can be prevented).
Note that in the case of the MISO method or the MIMO method, a pilot symbol is inserted to each modulated signal to be transmitted from each transmitting antenna.
Then, the insertion of pilot symbol 601 as illustrated in
Note that in
Characteristic points of the present exemplary embodiment will be described.
As described above, the frame configurations in
In order to realize the above, the transmitting apparatus (
For example, in a case where the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
Then, the receiving apparatus can learn an outline of a frame configuration of a modulated signal transmitted by the transmitting apparatus, from the “information related to the frame configuration.”
As described above, the data symbol group is a symbol of any of the SISO (or SIMO) method, the MISO method and the MIMO method. The MISO method and the MIMO method will be described in particular below.
The MISO (transmitting) method using space time block codes (space frequency block codes) will be described.
A configuration in a case where signal processor 112 in
Mapper 702 receives an input of data signal (data obtained after error correction coding) 701 and control signal 706. Mapper 702 performs mapping based on information contained in control signal 706 and related to a modulating method. Mapper 702 outputs signal 703 obtained after the mapping. For example, signal 703 obtained after the mapping is arranged in order of s0, s1, s2, s3, . . . , s(2i), s(2i+1), . . . (i is an integer equal to or more than 0).
MISO (Multiple Input Multiple Output) processor 704 receives an input of signal 703 obtained after the mapping and control signal 706. MISO processor 704 outputs signals 705A and 705B obtained after MISO processing in a case where control signal 706 instructs transmission by the MISO method. For example, signal 705A obtained after the MISO processing is of s0, s1, s2, s3, s(2i), s(2i+1), . . . , and signal 705B obtained after the MISO processing is of −s1*, s0*, −s3*, s2* . . . , −s(2i+1)*, s(2i)*, . . . . Note that “*” means a complex conjugate (for example, s0* is a complex conjugate of s0).
In this case, signals 705A and 705B obtained after the MISO processing correspond to modulated signal 1 (113_1) obtained after signal processing in
Then, modulated signal 1 (113_1) obtained after the signal processing is subjected to predetermined processing, and is transmitted as a radio wave from antenna 126_1. Moreover, modulated signal 1 (113_2) obtained after the signal processing is subjected to predetermined processing, and is transmitted as a radio wave from antenna 126_2.
Mapper 702 receives an input of data signal (data obtained after error correction coding) 701 and control signal 706. Mapper 702 performs mapping based on information contained in control signal 706 and related to a modulating method. Mapper 702 outputs signal 703 obtained after the mapping. For example, signal 703 obtained after the mapping is arranged in order of s0, s1, s2, s3, . . . , s(2i), s(2i+1), (i is an integer equal to or more than 0).
MISO (Multiple Input Multiple Output) processor 704 receives an input of signal 703 obtained after the mapping and control signal 706. MISO processor 704 outputs signals 705A and 705B obtained after MISO processing in a case where control signal 706 instructs transmission by the MISO method. For example, signal 705A obtained after the MISO processing is of s0, −s1*, s2, −s3*, s(2i), −s(2i+1)*, . . . , and signal 705B obtained after the MISO processing is of s1, s0*, s3, s2* . . . , s(2i+1), s(2i)*, . . . . Note that “*” means a complex conjugate (for example, s0* is a complex conjugate of s0).
In this case, signals 705A and 705B obtained after the MISO processing correspond to modulated signal 1 (113_1) obtained after signal processing in
Then, modulated signal 1 (113_1) obtained after the signal processing is subjected to predetermined processing, and is transmitted as a radio wave from antenna 126_1. Moreover, modulated signal 1 (113_2) obtained after the signal processing is subjected to predetermined processing, and is transmitted as a radio wave from antenna 126_2.
Next, an MIMO method to which precoding, phase change and power change are applied will be described as an example of the MIMO method (however, the method for transmitting a plurality of streams from a plurality of antennas is not limited to this method, and the present exemplary embodiment can also be carried out by another method).
A configuration in a case where signal processor 112 in
Encoder 1102 in
Mapper 1104 receives an input of encoded data 1103, and control signal 1112. Then, it is assumed that control signal 1112 specifies transmission of two streams as a transmitting method. In addition, it is assumed that control signal 1112 specifies modulating method α and modulating method β as modulating methods of the two streams, respectively. Note that modulating method α is a modulating method for modulating xbit data, and modulating method β is a modulating method for modulating ybit data (for example, the modulating method is a modulating method for modulating 4bit data in a case of 16QAM (16. Quadrature Amplitude Modulation), and a modulating method for modulating 6bit data in a case of 64QAM (64. Quadrature Amplitude Modulation)).
Then, mapper 1104 modulates the xbit data of x+ybit data by modulating method α, generates and outputs baseband signal s_{1}(t) (1105A), and also modulates the remaining ybit data by modulating method β, and outputs baseband signal s_{2}(t) (1105B) (note that
Note that s_{1}(t) and s_{2}(t) are expressed by complex numbers (however, s_{1}(t) and s_{2}(t) may be any of complex numbers and actual numbers), and t represents time. Note that when a transmitting method using multicarriers such as OFDM (Orthogonal Frequency Division Multiplexing) is used, each of s_{1 }and s_{2 }can also be considered as a function of frequency f like s_{1}(f) and s_{2}(f) or as a function of time t and frequency f like s_{1}(t, f) and s_{2}(t, f).
A baseband signal, a precoding matrix, phase change and the like will be described below as a function of time t, but may be considered as a function of frequency f and a function of time t and frequency f.
Hence, there is also a case where a baseband signal, a precoding matrix, phase change and the like are described as a function of symbol number i. However, in this case, a baseband signal, a precoding matrix, phase change and the like only need to be considered as a function of time t, a function of frequency f and a function of time t and frequency f. That is, a symbol and a baseband signal may be generated and arranged in a time axis direction, and may be generated and arranged in a frequency axis direction. Moreover, a symbol and a baseband signal may be generated and arranged in the time axis direction and the frequency axis direction.
Power changer 1106A (power adjuster 1106A) receives an input of baseband signal s_{1}(t) (1105A), and control signal 1112. Power changer 1106A sets actual number P_{1 }based on control signal 1112. Power changer 1106A outputs P_{1}×s_{1}(t) as signal 1107A obtained after power change (note that P_{1 }is assumed to be an actual number, but may be a complex number).
Similarly, power changer 1106B (power adjuster 1106B) receives an input of baseband signal s_{2}(t) (1105B), and control signal 512. Power changer 1106B sets actual number P_{2}. Power changer 11066 outputs P_{2}×s_{2}(t) as signal 11076 obtained after power change (note that P_{2 }is assumed to be an actual number, but may be a complex number).
Weighting synthesizer 1108 receives an input of signal 1107A obtained after the power change, signal 11076 obtained after the power change, and control signal 1112. Weighting synthesizer 1108 sets precoding matrix F (or F(i)) based on control signal 1112. Weighting synthesizer 1108 performs the following arithmetic operation, assuming that a slot number (symbol number) is i.
Here, a(i), b(i), c(i) and d(i) can be expressed by complex numbers (or may be actual numbers), and three or more of a(i), b(i), c(i) and d(i) should not be 0 (zero). Note that a precoding matrix may be a function of i or may not be the function of i. Then, when a precoding matrix is the function of i, the precoding matrices are switched according to a slot number (symbol number).
Then, weighting synthesizer 1108 outputs u_{1}(i) in equation (1) as signal 1109A obtained after weighting synthesis. Weighting synthesizer 1108 outputs u_{2}(i) in equation (1) as signal 1109B obtained after the weighting synthesis.
Power changer 1110A receives an input of signal 1109A (u_{1}(i)) obtained after the weighting synthesis, and control signal 512. Power changer 1110A sets actual number Q_{1 }based on control signal 1112. Power changer 1110A outputs Q_{1}×u_{1}(t) as signal 1111A (z_{1}(i)) obtained after power change (note that Q_{1 }is assumed to be an actual number, but may be a complex number).
Similarly, power changer 1110B receives an input of signal 1109B (u_{2}(i)) obtained after the weighting synthesis, and control signal 1112. Power changer 1110B sets actual number Q_{2 }based on control signal 512. Power changer 1110B outputs Q_{2}×u_{2}(t) as signal 1111B (z_{2}(i)) obtained after the power change (note that Q_{2 }is assumed to be an actual number, but may be a complex number).
Hence, the following equation holds.
Next, a method for transmitting two streams different from the transmitting method in
Phase changer 1161 receives an input of signal 1109B obtained after weighting synthesis of u_{2}(i) in equation (1), and control signal 1112. Phase changer 1161 changes a phase of signal 1109B obtained after the weighting synthesis of u_{2}(i) in equation (1) based on control signal 1112. Hence, a signal obtained after the phase change of signal 1109B obtained after the weighting synthesis of u_{2}(i) in equation (1) is expressed by e^{jθ(i)}×u_{2}(i). Phase changer 1161 outputs e^{jθ(i)}×u_{2}(i) as signal 1162 obtained after the phase change (j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being the function of i like θ(i).
Then, power changers 1110A and 11106 in
Note that as a method for realizing equation (3), there is
When value θ(i) of a phase to be changed in equation (3) and equation (4) is set such that, for example, θ(i+1)−θ(i) is a fixed value, the receiving apparatus is highly likely to obtain good data reception quality in radio wave propagation environment in which a direct wave is dominant. However, how to give value θ(i) of a phase to be changed is not limited to this example.
The case where there are some of (or all of) the power changers is described as an example with reference to
For example, when there are neither power changer 1106A (power adjuster 1106A) nor power changer 1106B (power adjuster 1106B) in
Moreover, when there are neither power changer 1110A (power adjuster 1110A) nor power changer 11106 (power adjuster 11106) in
Moreover, when there are neither power changer 1106A (power adjuster 1106A), nor power changer 1106B (power adjuster 1106B), nor power changer 1110A (power adjuster 1110A) nor power changer 1110B (power adjuster 11108) in
Moreover, when there are neither power changer 1106A (power adjuster 1106A) nor power changer 1106B (power adjuster 1106B) in
Moreover, when there are neither power changer 1110A (power adjuster 1110A) nor power changer 1110E (power adjuster 11108) in
Moreover, when there are neither power changer 1106A (power adjuster 1106A), nor power changer 1106B (power adjuster 1106B), nor power changer 1110A (power adjuster 1110A) nor power changer 11106 (power adjuster 11106) in
Next, a method for transmitting two streams different from the transmitting methods in
Characteristic points in
Phase changer 1151 receives an input of baseband signal s_{2}(i) (1105B), and control signal 1112. Phase changer 1151 changes a phase of baseband signal s_{2}(i) (1105B) based on control signal 1112. In this case, a phase change value is e^{jλ(i) }(j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being a function of i like λ(i).
Then, as considered in the same way as equation (1) to equation (10), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (11), there is a configuration of switching power changer 1106B and phase changer 1151 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (11) and z_{1}(i) of equation (12) are equal, and z_{2}(i) of equation (11) and z_{2}(i) of equation (12) are equal.
Then, as considered in the same way as equation (1) to equation (12), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (13), there is a configuration of switching power changer 1106B and phase changer 1151 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (11), z_{1}(i) of equation (12), z_{1}(i) of equation (13) and z_{1}(i) of equation (14) are equal, and z_{2}(i) of equation (11), z_{2}(i) of equation (12), z_{2}(i) of equation (13) and z_{2}(i) of equation (14) are equal.
Next, a method for transmitting two streams different from the transmitting methods in
Characteristic points in
Phase changer 1151 receives an input of baseband signal s_{2}(i) (1105B), and control signal 1112. Phase changer 1151 changes a phase of baseband signal s_{2}(i) (1105B) based on control signal 1112. In this case, a phase change value is e^{jλ(i) }(j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being a function of i like λ(i).
Moreover, phase changer 1181 receives an input of baseband signal s_{1}(i) (1105A), and control signal 1112. Phase changer 1181 changes a phase of baseband signal s_{1}(i) (1105A) based on control signal 1112. In this case, a phase change value is e^{jδ(i) }(j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being a function of i like δ(i).
Then, as considered in the same way as equation (1) to equation (14), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (15), there is a configuration of switching power changer 1106B and phase changer 1151 in order and of switching power changer 1106A and phase changer 1181 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (15) and z_{1}(i) of equation (16) are equal, and z_{2}(i) of equation (15) and z_{2}(i) of equation (16) are equal.
Then, as considered in the same way as equation (1) to equation (16), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (17), there is a configuration of switching power changer 1106B and phase changer 1151 in order and of switching power changer 1106A and phase changer 1181 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (15), z_{1}(i) of equation (16), z_{1}(i) of equation (17) and z_{1}(i) of equation (18) are equal, and z_{2}(i) of equation (15), z_{2}(i) of equation (16), z_{2}(i) of equation (17) and z_{2}(i) of equation (18) are equal.
Next, a method for transmitting two streams different from the transmitting methods in
Characteristic points in
Phase changer 1151 receives an input of baseband signal s_{2}(i) (1105B), and control signal 1112. Phase changer 1151 changes a phase of baseband signal s_{2}(i) (1105B) based on control signal 1112. In this case, a phase change value is e^{jλ(i) }(j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being a function of i like λ(i).
Moreover, phase changer 1181 receives an input of baseband signal s_{1}(i) (1105A), and control signal 1112. Phase changer 1181 changes a phase of baseband signal s_{1}(i) (1105A) based on control signal 1112. In this case, a phase change value is e^{jδ(i) }(j is a unit of an imaginary number). Note that a value of a phase to be changed is a portion characterized by being a function of i like δ(i).
Phase changer 1161 performs phase change on an input signal. A phase change value in this case is θ(i). Similarly, phase changer 1191 performs phase change on an input signal. A phase change value in this case is ω(i).
Then, as considered in the same way as equation (1) to equation (18), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (19), there is a configuration of switching power changer 1106B and phase changer 1151 in order and of switching power changer 1106A and phase changer 1181 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (19) and z_{1}(i) of equation (20) are equal, and z_{2}(i) of equation (19) and z_{2}(i) of equation (20) are equal.
Then, as considered in the same way as equation (1) to equation (20), z_{1}(i) and z_{2}(i) which are output signals in
Note that as a method for realizing equation (21), there is a configuration of switching power changer 1106B and phase changer 1151 in order and of switching power changer 1106A and phase changer 1181 in order as a configuration different from the configuration in
As a matter of course, z_{1}(i) of equation (19), z_{1}(i) of equation (20), z_{1}(i) of equation (21) and z_{1}(i) of equation (22) are equal, and z_{2}(i) of equation (19), z_{2}(i) of equation (20), z_{2}(i) of equation (21) and z_{2}(i) of equation (22) are equal.
Matrix F for weighting synthesis (precoding) is described above. However, each exemplary embodiment herein can also be carried out by using precoding matrix F (or F(i)) described below.
Note that in equation (23), equation (24), equation (25), equation (26), equation (27), equation (28), equation (29), and equation (30), a may be an actual number or may be an imaginary number, and β may be an actual number or may be an imaginary number. However, α is not 0 (zero). Then, β is not 0 (zero), either.
Alternatively
Note that in equation (31), equation (33), equation (35) and equation (37), β may be an actual number or may be an imaginary number. However, β is not 0 (zero).
Alternatively
Here, each of θ_{11}(i), θ_{21}(i) and λ(i) is a function of i (a function of time, a function of a frequency or a function of time and a frequency), λ is a fixed value, α may be an actual number or may be an imaginary number, and β may be an actual number or may be an imaginary number. However, α is not 0 (zero). Then, β is not 0 (zero), either.
Alternatively
Here, θ(i) is a function of i (a function of time, a function of a frequency or a function of time and a frequency), and β may be an actual number or may be an imaginary number. However, β is not 0 (zero), either.
Moreover, each exemplary embodiment herein can also be carried out by using a precoding matrix other than these matrices.
In addition, there may be a method for performing precoding without performing the abovedescribed phase change, to generate a modulated signal and transmit the modulated signal from the transmitting apparatus. In this case, there can be considered an example where z_{1}(i) and z_{2}(i) are expressed by the following equation.
Then, z_{1}(i) (or z_{1}(i) of equation (56), z_{1}(i) of equation (57), z_{1}(i) of equation (58), z_{1}(i) of equation (59) or z_{1}(i) of equation (60)) obtained in
Part (A) of
Part (A) of
 z_{1}(0) is arranged at carrier 0 and time 1,
 z_{1}(1) is arranged at carrier 1 and time 1,
 z_{1}(2) is arranged at carrier 2 and time 1,
 . . .
 z_{1}(10) is arranged at carrier 0 and time 2,
 z_{1 }(11) is arranged at carrier 1 and time 2,
 z_{1}(12) is arranged at carrier 2 and time 2, and
 . . . .
Similarly, when z_{2}(0), z_{2}(1), z_{2}(2), z_{2}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated in (B) of
 z_{2}(0) is arranged at carrier 0 and time 1,
 z_{2}(1) is arranged at carrier 1 and time 1,
 z_{2}(2) is arranged at carrier 2 and time 1,
 . . .
 z_{2}(10) is arranged at carrier 0 and time 2,
 z_{2}(11) is arranged at carrier 1 and time 2,
 z_{2}(12) is arranged at carrier 2 and time 2, and
 . . . .
In this case, z_{1}(a) and z_{2}(a) in a case of i=a are transmitted from the same frequency and from the same time. Then,
Part (A) of
Part (A) of
 z_{1}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated,
 z_{1}(0) is arranged at carrier 0 and time 1,
 z_{1}(1) is arranged at carrier 1 and time 2,
 z_{1}(2) is arranged at carrier 2 and time 1,
 . . .
 z_{1}(10) is arranged at carrier 2 and time 2,
 z_{1}(11) is arranged at carrier 7 and time 1,
 z_{1}(12) is arranged at carrier 8 and time 2, and
 . . . .
Similarly, when z_{2}(0), z_{2}(1), z_{2}(2), z_{2}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated in (B) of
 z_{2}(0) is arranged at carrier 0 and time 1,
 z_{2}(1) is arranged at carrier 1 and time 2,
 z_{2}(2) is arranged at carrier 2 and time 1,
 . . .
 z_{2}(10) is arranged at carrier 2 and time 2,
 z_{2}(11) is arranged at carrier 7 and time 1,
 z_{2}(12) is arranged at carrier 8 and time 2, and
 . . . .
In this case, z_{1 }(a) and z_{2}(a) in a case of i=a are transmitted from the same frequency and from the same time. Then,
Part (A) of
Part (A) of
 z_{1}(0) is arranged at carrier 0 and time 1,
 z_{1}(1) is arranged at carrier 2 and time 1,
 z_{1}(2) is arranged at carrier 4 and time 1,
 . . .
 z_{1}(10) is arranged at carrier 0 and time 2,
 z_{1 }(11) is arranged at carrier 2 and time 2,
 z_{1}(12) is arranged at carrier 4 and time 2, and
 . . . .
Similarly, when z_{2}(0), z_{2}(1), z_{2}(2), z_{2}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated in (B) of
 z_{2}(0) is arranged at carrier 0 and time 1,
 z_{2}(1) is arranged at carrier 2 and time 1,
 z_{2}(2) is arranged at carrier 4 and time 1,
 . . .
 z_{2}(10) is arranged at carrier 0 and time 2,
 z_{2}(11) is arranged at carrier 2 and time 2,
 z_{2}(12) is arranged at carrier 4 and time 2, and
 . . . .
In this case, z_{1 }(a) and z_{2}(a) in a case of i=a are transmitted from the same frequency and from the same time. Then,
Part (A) of
Part (A) of
 z_{1}(0) is arranged at carrier 0 and time 1,
 z_{1}(1) is arranged at carrier 1 and time 1,
 z_{1}(2) is arranged at carrier 0 and time 2,
 . . .
 z_{1}(10) is arranged at carrier 2 and time 2,
 z_{1 }(11) is arranged at carrier 3 and time 2,
 z_{1}(12) is arranged at carrier 2 and time 3, and
 . . . .
Similarly, when z_{2}(0), z_{2}(1), z_{2}(2), z_{2}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated in (B) of
 z_{2}(1) is arranged at carrier 1 and time 1,
 z_{2}(2) is arranged at carrier 0 and time 2,
 . . .
 z_{2}(10) is arranged at carrier 2 and time 2,
 z_{2}(11) is arranged at carrier 3 and time 2,
 z_{2}(12) is arranged at carrier 2 and time 3, and
 . . . .
In this case, z_{1 }(a) and z_{2}(a) in a case of i=a are transmitted from the same frequency and from the same time. Then,
Part (A) of
Part (A) of
 z_{1}(0) is arranged at carrier 0 and time 1,
 z_{1}(1) is arranged at carrier 0 and time 2,
 z_{1}(2) is arranged at carrier 0 and time 3,
 . . .
 z_{1}(10) is arranged at carrier 2 and time 3,
 z_{1}(11) is arranged at carrier 2 and time 4,
 z_{1}(12) is arranged at carrier 3 and time 1, and
 . . . .
Similarly, when z_{2}(0), z_{2}(1), z_{2}(2), z_{2}(3), . . . corresponding to i=0, 1, 2, 3, . . . are generated in (B) of
 z_{2}(0) is arranged at carrier 0 and time 1,
 z_{2}(1) is arranged at carrier 0 and time 2,
 z_{2}(2) is arranged at carrier 0 and time 3,
 . . .
 z_{2}(10) is arranged at carrier 2 and time 3,
 z_{2}(11) is arranged at carrier 2 and time 4,
 z_{2}(12) is arranged at carrier 3 and time 1, and
 . . . .
In this case, z_{1}(a) and z_{2}(a) in a case of i=a are transmitted from the same frequency and from the same time. Then,
The transmitting apparatus may arrange symbols by any method of the methods in
In
First preamble detector/decoder 2311 receives an input of signals 2304_X and 2304_Y obtained after the signal processing. First preamble detector/decoder 2311 performs signal detection and timefrequency synchronization by detecting a first preamble, and simultaneously obtains control information contained in the first preamble (by performing demodulation and error correction decoding) and outputs first preamble control information 2312.
Second preamble demodulator 2313 receives an input of signals 2304_X and 2304_Y obtained after the signal processing, and first preamble control information 2312. Second preamble demodulator 2313 performs signal processing based on first preamble control information 2312. Second preamble demodulator 2313 performs demodulation (error correction decoding). Second preamble demodulator 2313 outputs second preamble control information 2314.
Control information generator 2315 receives an input of first preamble control information 2312, and second preamble control information 2314. Control information generator 2315 bundles control information (related to a receiving operation) and outputs the control information as control signal 2316. Then, control signal 2316 is input to each unit as illustrated in
Modulated signal z_{1 }channel fluctuation estimator 2305_1 receives an input of signal 2304_X obtained after the signal processing, and control signal 2316. Modulated signal z_{1 }channel fluctuation estimator 2305_1 estimates a channel fluctuation between an antenna from which the transmitting apparatus has transmitted modulated signal z_{1 }and receiving antenna 2301_X by using a pilot symbol or the like contained in signal 2304_X obtained after the signal processing, and outputs channel estimation signal 2306_1.
Modulated signal z_{2 }channel fluctuation estimator 2305_2 receives an input of signal 2304_X obtained after the signal processing, and control signal 2316. Modulated signal z_{2 }channel fluctuation estimator 2305_2 estimates a channel fluctuation between an antenna from which the transmitting apparatus has transmitted modulated signal z_{2 }and receiving antenna 2301_X by using a pilot symbol or the like contained in signal 2304_X obtained after the signal processing, and outputs channel estimation signal 2306_2.
Modulated signal z_{1 }channel fluctuation estimator 2307_1 receives an input of signal 2304_Y obtained after the signal processing, and control signal 2316. Modulated signal z_{1 }channel fluctuation estimator 2307_1 estimates a channel fluctuation between an antenna from which the transmitting apparatus has transmitted modulated signal z_{1 }and receiving antenna 2301_Y by using a pilot symbol or the like contained in signal 2304_Y obtained after the signal processing, and outputs channel estimation signal 2308_1.
Modulated signal z_{2 }channel fluctuation estimator 2307_2 receives an input of signal 2304_Y obtained after the signal processing, and control signal 2316. Modulated signal z_{2 }channel fluctuation estimator 2307_2 estimates a channel fluctuation between an antenna from which the transmitting apparatus has transmitted modulated signal z_{2 }and receiving antenna 2301_Y by using a pilot symbol or the like contained in signal 2304_Y obtained after the signal processing, and outputs channel estimation signal 2308_2.
Signal processor 2309 receives an input of signals 2306_1, 2306_2, 2308_1, 2308_2, 2304_X and 2304_Y, and control signal 2316. Signal processor 2309 performs demodulation and decoding processing based on information such as a transmitting method, a modulating method, an error correction coding method, a coding rate of error correction coding and a block size of an error correction code contained in control signal 2316. Signal processor 2309 outputs received data 2310. In this case, other wave detection (demodulation)/decoding are performed based on the abovedescribed transmitting method.
Note that the receiving apparatus extracts a necessary symbol from control signal 2316, and performs demodulation (including signal demultiplexing and signal wave detection) and error correction decoding. Moreover, a configuration of the receiving apparatus is not limited to this configuration.
As described above, there is an advantage that flexible video information and flexible broadcast service can be provided to the receiving apparatus (viewer) by enabling the transmitting apparatus to select any frame configuration of the frame configurations in
Moreover, when the transmitting apparatus selects any of the frame configurations in
Note that in the frame configurations in
Then, the data symbol group is indicated in the frame configurations in
Moreover, another symbol (for example, a pilot symbol, a null symbol (an inphase component of the symbol is 0 (zero, and a quadrature component is 0 (zero))), a control information symbol and a data symbol) may be inserted to the pilot symbol in
The first exemplary embodiment describes the case where the transmitting apparatus selects any of the frame configurations in
As described in the first exemplary embodiment, the transmitting apparatus (
For example, in a case where the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
The receiving apparatus can learn an outline of a frame configuration of a modulated signal transmitted by the transmitting apparatus, from the “information related to the frame configuration.”
Further, the transmitting apparatus (
A case where the transmitting apparatus (
In this case, when the method for transmitting data symbol group #(j=K) is of single stream transmission (SISO (SIMO) transmission), the transmitting apparatus sets a(K, 0)=0 and a(K, 1)=0 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is of space time block codes (or space frequency block codes) (MISO transmission), the transmitting apparatus sets a(K, 0)=1 and a(K, 1)=0 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is MIMO method #1, the transmitting apparatus sets a(K, 0)=0 and a(K, 1)=1 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is MIMO method #2, the transmitting apparatus sets a(K, 0)=1 and a(K, 1)=1 and transmits a(K, 0) and a(K, 1).
Note that MIMO method #1 and MIMO method #2 are different methods and are any method of the abovedescribed MIMO methods. Moreover, here, MIMO method #1 and MIMO method #2 are used. However, the MIMO method which the transmitting apparatus can select may be of one type or may be of two or more types.
In
A case where the transmitting apparatus (
In this case, a definition described below is made. In a case where the transmitting method is of single stream transmission (SISO (SIMO) transmission), for example, in a case where a(K, 0)=0 and a(K, 1)=0 are set in data symbol #(j=K), when b(K, 0)=0 and b(K, 1)=0 hold, the transmitting apparatus sets a data symbol modulating method to QPSK.
When b(K, 0)=1 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM.
When b(K, 0)=0 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 64QAM.
When b(K, 0)=1 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 256QAM.
In a case where the transmitting method is of space time block codes (or space frequency block codes) (MISO transmission), or is MIMO method #1 or MIMO method #2, for example, in a case where a(K, 0)=1 and a(K, 1)=0, a(K, 0)=0 and a(K, 1)=1 or a(K, 0)=1 and a(K, 1)=1 are set in data symbol #(j=K),
 when b(K, 0)=0 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to QPSK in stream 1 and 16QAM in stream 2.
When b(K, 0)=1 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM in stream 1 and 16QAM in stream 2.
When b(K, 0)=0 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM in stream 1 and 64QAM in stream 2.
When b(K, 0)=1 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 64QAM in stream 1 and 64QAM in stream 2.
Note that the modulating method is not limited to the abovedescribed modulating methods. For example, the modulating method may include a modulating method such as an APSK method, nonuniform QAM and nonuniform mapping. The modulating method will be described in detail below.
In
A case where the transmitting apparatus (
In this case, when an error correction coding method of data symbol group #(j=K) is of an error correction code of A and a code length of a, the transmitting apparatus sets c(K, 0)=0 and c(K, 1)=0 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of the error correction code of A and a code length of 13, the transmitting apparatus sets c(K, 0)=1 and c(K, 1)=0 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of an error correction code of B and the code length of a, the transmitting apparatus sets c(K, 0)=0 and c(K, 1)=1 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of the error correction code of B and the code length of 13, the transmitting apparatus sets c(K, 0)=1 and c(K, 1)=1 and transmits c(K, 0) and c(K, 1).
Note that the setting of the error correction code is not limited to the two settings, and the transmitting apparatus only needs to be able to set one or more types of error correction codes. The setting of the code length is not limited to the two settings, and the transmitting apparatus only needs to be able to set two or more code lengths.
In
A case where the transmitting apparatus (
In this case, when the coding rate of the error correction code of data symbol group #(j=K) is 1/2, the transmitting apparatus sets d(K, 0)=0 and d(K, 1)=0 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 2/3, the transmitting apparatus sets d(K, 0)=1 and d(K, 1)=0 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 3/4, the transmitting apparatus sets d(K, 0)=0 and d(K, 1)=1 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 4/5, the transmitting apparatus sets d(K, 0)=1 and d(K, 1)=1 and transmits d(K, 0) and d(K, 1).
Note that the setting of the coding rate of the error correction code is not limited to the four settings, and the transmitting apparatus only needs to be able to set one or more types of coding rates of the error correction code.
In
A case where the transmitting apparatus (
In this case, when the number of symbols in the frame of data symbol group #(j=K) is of 256 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 512 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 1024 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 2048 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
Note that the setting of the number of symbols is not limited to the four settings, and the transmitting apparatus only needs to be able to set one or more types of the number of symbols.
In
A case where the transmitting apparatus (
In this case, when the method for transmitting data symbol group #(j=K) is of single stream transmission (SISO (SIMO) transmission), the transmitting apparatus sets a(K, 0)=0 and a(K, 1)=0 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is of space time block codes (or space frequency block codes) (MISO transmission), the transmitting apparatus sets a(K, 0)=1 and a(K, 1)=0 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is MIMO method #1, the transmitting apparatus sets a(K, 0)=0 and a(K, 1)=1 and transmits a(K, 0) and a(K, 1).
When the method for transmitting data symbol group #(j=K) is MIMO method #2, the transmitting apparatus sets a(K, 0)=1 and a(K, 1)=1 and transmits a(K, 0) and a(K, 1).
Note that MIMO method #1 and MIMO method #2 are different methods and are any method of the abovedescribed MIMO methods. Moreover, here, MIMO method #1 and MIMO method #2 are used. However, the MIMO method which the transmitting apparatus can select may be of one type or may be of two or more types.
In
A case where the transmitting apparatus (
In this case, a definition described below is made. In a case where the transmitting method is of single stream transmission (SISO (SIMO) transmission), for example, in a case where a(K, 0)=0 and a(K, 1)=0 are set in data symbol #(j=K), when b(K, 0)=0 and b(K, 1)=0 hold, the transmitting apparatus sets a data symbol modulating method to QPSK.
When b(K, 0)=1 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM.
When b(K, 0)=0 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 64QAM.
When b(K, 0)=1 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 256QAM.
In a case where the transmitting method is of space time block codes (or space frequency block codes) (MISO transmission), or is MIMO method #1 or MIMO method #2, for example, in a case where a(K, 0)=1 and a(K, 1)=0, a(K, 0)=0 and a(K, 1)=1 or a(K, 0)=1 and a(K, 1)=1 are set in data symbol #(j=K),
 when b(K, 0)=0 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to QPSK in stream 1 and 16QAM in stream 2.
When b(K, 0)=1 and b(K, 1)=0 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM in stream 1 and 16QAM in stream 2.
When b(K, 0)=0 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 16QAM in stream 1 and 64QAM in stream 2.
When b(K, 0)=1 and b(K, 1)=1 hold, the transmitting apparatus sets the data symbol modulating method to 64QAM in stream 1 and 64QAM in stream 2.
Note that the modulating method is not limited to the abovedescribed modulating methods. For example, the modulating method may include a modulating method such as an APSK method, nonuniform QAM and nonuniform mapping. The modulating method will be described in detail below.
In
A case where the transmitting apparatus (
In this case, when an error correction coding method of data symbol group #(j=K) is of an error correction code of A and a code length of a, the transmitting apparatus sets c(K, 0)=0 and c(K, 1)=0 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of the error correction code of A and a code length of 13, the transmitting apparatus sets c(K, 0)=1 and c(K, 1)=0 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of an error correction code of B and the code length of a, the transmitting apparatus sets c(K, 0)=0 and c(K, 1)=1 and transmits c(K, 0) and c(K, 1).
When an error correction coding method of data symbol group #(j=K) is of the error correction code of B and a code length of 13, the transmitting apparatus sets c(K, 0)=1 and c(K, 1)=1 and transmits c(K, 0) and c(K, 1).
Note that the setting of the error correction code is not limited to the two settings, and the transmitting apparatus only needs to be able to set one or more types of error correction codes. The setting of the code length is not limited to the two settings, and the transmitting apparatus only needs to be able to set two or more code lengths.
In
A case where the transmitting apparatus (
In this case, when the coding rate of the error correction code of data symbol group #(j=K) is 1/2, the transmitting apparatus sets d(K, 0)=0 and d(K, 1)=0 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 2/3, the transmitting apparatus sets d(K, 0)=1 and d(K, 1)=0 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 3/4, the transmitting apparatus sets d(K, 0)=0 and d(K, 1)=1 and transmits d(K, 0) and d(K, 1).
When the coding rate of the error correction code of data symbol group #(j=K) is 4/5, the transmitting apparatus sets d(K, 0)=1 and d(K, 1)=1 and transmits d(K, 0) and d(K, 1).
Note that the setting of the coding rate of the error correction code is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of coding rates of the error correction code.
In
A case where the transmitting apparatus (
In this case, when there is a mix of a plurality of data symbol groups in a certain time interval like data symbol group #1 and data symbol group #2 of the frames in
In this case, when this time interval is of 128 OFDM symbols, the transmitting apparatus sets f(0)=0 and f(1)=0 and transmits f(0) and f(1).
When this time interval is of 256 OFDM symbols, the transmitting apparatus sets f(0)=1 and f(1)=0 and transmits f(0) and f(1).
When this time interval is of 512 OFDM symbols, the transmitting apparatus sets f(0)=0 and f(1)=1 and transmits f(0) and f(1).
When this time interval is of 1024 OFDM symbols, the transmitting apparatus sets f(0)=1 and f(1)=0 and transmits f(0) and f(1).
Note that the setting of the time interval is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of the time intervals.
A case where the transmitting apparatus (
In this case, when there is no other data symbol group in a certain time interval like data symbol group #3 in
When the number of symbols in the frame of data symbol group #(j=K) is of 256 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 512 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 1024 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 2048 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
Note that the setting of the number of symbols is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of the number of symbols.
In
A case where the transmitting apparatus (
In this case, when there is a mix of a plurality of data symbol groups in a certain time interval like data symbol group #1 and data symbol group #2 of the frames in
In this case, information related to the number of carriers is g(0) and g(1). For example, a total number of carriers is of 512 carriers.
When the number of carriers of a first data symbol group is of 480 carriers and the number of carriers of a second symbol group is of 32 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=0 and g(1)=0 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 448 carriers and the number of carriers of the second symbol group is of 64 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=1 and g(1)=0 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 384 carriers and the number of carriers of the second symbol group is of 128 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=0 and g(1)=1 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 256 carriers and the number of carriers of the second symbol group is of 256 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=1 and g(1)=1 and transmits g(0) and g(1).
Note that the setting of the number of carriers is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of the number of carriers.
The case where there is a mix of two data symbol groups is described with reference to
Elements operating in the same way as in
The transmitting apparatus in
Note that in a case where the transmitting apparatus (
When the transmitting apparatus transmits a modulated signal with the frame configuration in
When the transmitting apparatus transmits a modulated signal with the frame configuration in
Note that in
Then, a case where the transmitting apparatus (
In this case, when there is a mix of a plurality of data symbol groups in a certain time interval like data symbol group #1, data symbol group #2 and data symbol group #4 of the frames in
In this case, information related to the number of carriers is g(0) and g(1). For example, a total number of carriers is of 512 carriers.
When the number of carriers of the first data symbol group is of 448 carriers, the number of carriers of the second symbol group is of 32 carriers and the number of carriers of a third symbol group is of 32 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=0 and g(1)=0 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 384 carriers, the number of carriers of the second symbol group is of 64 carriers and the number of carriers of the third symbol group is of 64 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=1 and g(1)=0 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 256 carriers, the number of carriers of the second symbol group is of 128 carriers and the number of carriers of the third symbol group is of 128 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=0 and g(1)=1 and transmits g(0) and g(1).
When the number of carriers of the first data symbol group is of 480 carriers, the number of carriers of the second symbol group is of 16 carriers and the number of carriers of the third symbol group is of 16 carriers among the two data symbol groups, the transmitting apparatus sets g(0)=1 and g(1)=1 and transmits g(0) and g(1).
Note that the setting of the number of carriers is not limited to the four settings, and the transmitting apparatus only needs to be able to set one or more types of the number of carriers.
Moreover, an effect of improvement in data transmission efficiency can be obtained when in frames in which there is a mix of a “case where there is a mix of a plurality of data symbol groups in a first time interval” and a “case where there is only one data symbol group in a second time interval” as in
Hence, control information related to a carrier interval related to the “case where there is the mix of a plurality of data symbol groups in the first time interval” is ha(0) and ha(1).
In this case, when the carrier interval is 0.25 kHz, the transmitting apparatus sets ha(0)=0 and ha(1)=0, and transmits ha(0) and ha(1).
When the carrier interval is 0.5 kHz, the transmitting apparatus sets ha(0)=1 and ha(1)=0, and transmits ha(0) and ha(1).
When the carrier interval is 1 kHz, the transmitting apparatus sets ha(0)=0 and ha(1)=1, and transmits ha(0) and ha(1).
When the carrier interval is 2 kHz, the transmitting apparatus sets ha(0)=1 and ha(1)=1, and transmits ha(0) and ha(1).
Note that the setting of the carrier interval is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of the carrier intervals.
Then, control information related to a carrier interval related to the “case where there is only one data symbol group in the second time interval” is hb(0) and hb(1).
In this case, when the carrier interval is 0.25 kHz, the transmitting apparatus sets hb(0)=0 and hb(1)=0, and transmits hb(0) and hb(1).
When the carrier interval is 0.5 kHz, the transmitting apparatus sets hb(0)=1 and hb(1)=0, and transmits hb(0) and hb(1).
When the carrier interval is 1 kHz, the transmitting apparatus sets hb(0)=0 and hb(1)=1, and transmits hb(0) and hb(1).
When the carrier interval is 2 kHz, the transmitting apparatus sets hb(0)=1 and hb(1)=1, and transmits hb(0) and hb(1).
Note that the setting of the carrier interval is not limited to the four settings, and the transmitting apparatus only needs to be able to set two or more types of the carrier intervals.
Here, set values of the carrier interval selectable in any of the “case where there is the mix of a plurality of data symbol groups in the first time interval” and the “case where there is only one data symbol group in the second time interval” are made the same such that the set values of the carrier interval in the “case where there is the mix of a plurality of data symbol groups in the first time interval” are 0.25 kHz, 0.5 kHz, 1 kHz and 2 kHz and the set values of the carrier interval in the “case where there is only one data symbol group in the second time interval” are 0.25 kHz, 0.5 kHz, 1 kHz and 2 kHz. However, a set of set values selectable in the “case where there is the mix of a plurality of data symbol groups in the first time interval” and a set of set values selectable in the “case where there is only one data symbol group in the second time interval” may be different. For example, the set values of the carrier interval in the “case where there is the mix of a plurality of data symbol groups in the first time interval” may be 0.25 kHz, 0.5 kHz, 1 kHz and 2 kHz, and the set values of the carrier interval in the “case where there is only one data symbol group in the second time interval” may be 0.125 kHz, 0.25 kHz, 0.5 kHz and 1 kHz (the settable values are not limited to this example).
Note that there can be considered a method for transmitting control information ha(0) and ha(1) related to the carrier interval related to the “case where there is the mix of a plurality of data symbol groups in the first time interval,” and control information hb(0) and hb(1) related to the carrier interval related to the “case where there is only one data symbol group in the second time interval” with any of the first preamble and the second preamble in
For example, in
In
Moreover, as another method, in
As a matter of course, the receiving apparatus (for example,
As described above, the information described in the present exemplary embodiment is transmitted as control information, and thus it is possible to obtain an effect of enabling improvement in data reception quality and improvement in data transmission efficiency and of enabling an accurate operation of the receiving apparatus.
Note that the frame configuration of a modulated signal transmitted by the transmitting apparatus in
Then, a method for transmitting data symbol groups #1 (401_1 and 401_2) in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 (401_1 and 401_2) and the method for transmitting data symbol group #2 (402) are of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 (401_1 and 401_2) and the method for transmitting data symbol group #2 (402) are of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol group #3 (403) is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #3 (403) is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a next “set of the first preamble and the second preamble” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission),” and in the method for transmitting a plurality of data symbol groups present between the “set of the first preamble and the second preamble” and the next “set of the first preamble and the second preamble,” there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission).
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, a fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Similarly, in the frame configuration in
In this case, either a case where the “method for transmitting data symbol group #1 (2501), the method for transmitting data symbol group #2 (2502) and the method for transmitting data symbol group #4 (2503) are of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #1 (2501), the method for transmitting data symbol group #2 (2502) and the method for transmitting data symbol group #4 (2503) are of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol group #3 (403) is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #3 (403) is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a next “set of the first preamble and the second preamble” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission),” and in the method for transmitting a plurality of data symbol groups present between the “set of the first preamble and the second preamble” and the next “set of the first preamble and the second preamble,” there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission).
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, a fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Moreover, in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 (401_1 and 401_2) and the method for transmitting data symbol group #2 (402) are of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 (401_1 and 401_2) and the method for transmitting data symbol group #2 (402) are of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol group #3 (403) is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #3 (403) is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a “pilot symbol” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission)” (there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission)). Then, a method for transmitting a plurality of data symbol groups present between the “pilot symbol” and a next “set of the first preamble and the second preamble” (however,
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Similarly, a method for transmitting data symbol group #1 (2501) in the frame configuration in
In this case, either a case where the “method for transmitting data symbol group #1 (2501), the method for transmitting data symbol group #2 (2502) and the method for transmitting data symbol group #4 (2503) are of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #1 (2501), the method for transmitting data symbol group #2 (2502) and the method for transmitting data symbol group #4 (2503) are of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol group #3 (403) is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol group #3 (403) is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a “pilot symbol” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission)” (there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission)). Then, a method for transmitting a plurality of data symbol groups present between the “pilot symbol” and a next “set of the first preamble and the second preamble” (however,
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement of data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
The first exemplary embodiment and the second exemplary embodiment describe the MIMO transmitting method using precoding and phase change for transmitting a plurality of streams by using a plurality of antennas (the MIMO transmitting method may be the MIMO transmitting method which does not perform phase change), and the MISO (MultipleInput SingleOutput) transmitting method using space time block codes (or space frequency block codes) for transmitting a plurality of streams by using a plurality of antennas. An example of a method for transmitting preambles in a case where it is considered that a transmitting apparatus transmits modulated signals by these transmitting methods will be described.
The transmitting apparatus in
“antenna 126_1 is a horizontal polarizing antenna, and antenna 126_2 is a vertical polarizing antenna,”
or
“antenna 126_1 is a vertical polarizing antenna, and antenna 126_2 is a horizontal polarizing antenna,”
or
“antenna 126_1 is a clockwise rotation round polarization antenna, and antenna 126_2 is a counterclockwise rotation round polarization antenna,”
or
“antenna 126_1 is a counterclockwise rotation round polarization antenna, and antenna 126_2 is a clockwise rotation round polarization antenna.”
Such an antenna configuring method will be referred to as a first antenna configuring method.
Moreover, an antenna configuring method other than the first antenna configuring method will be referred to as a second antenna configuring method. Hence, examples of the second antenna configuring method include methods in which
“antenna 126_1 is a horizontal polarizing antenna, and antenna 126_2 is a horizontal polarizing antenna,”
and
“antenna 126_1 is a vertical polarizing antenna, and antenna 126_2 is a vertical polarizing antenna,”
“antenna 126_1 is a counterclockwise rotation round polarization antenna, and antenna 126_2 is a counterclockwise rotation round polarization antenna,”
and
“antenna 126_1 is a clockwise rotation round polarization antenna, and antenna 126_2 is a clockwise rotation round polarization antenna.”
Each transmitting apparatus (
or
the second antenna configuring method (for example, “antenna 126_1 is the horizontal polarizing antenna, and antenna 126_2 is the horizontal polarizing antenna” or “antenna 126_1 is the vertical polarizing antenna, and antenna 126_2 is the vertical polarizing antenna”). For example, in a broadcast system, any antenna configuring method of the first antenna configuring method and the second antenna configuring method is adopted depending on a place to install the transmitting apparatus (installation area).
In such an antenna configuring method, a method for configuring a first preamble and a second preamble in a case of the frame configuring methods, for example, in
As with the second exemplary embodiment, the transmitting apparatus transmits control information related to the antenna configuring method by using the first preamble. In this case, the information related to the antenna configuring method is m(0) and m(1).
In this case, when in two transmitting antennas of the transmitting apparatus, a first transmitting antenna is a horizontal polarizing antenna (that is, the first transmitting antenna transmits a horizontally polarized first modulated signal) and a second transmitting antenna is a horizontal polarizing antenna (that is, the second transmitting antenna transmits a horizontally polarized second modulated signal), the transmitting apparatus sets m(0)=0 and m(1)=0, and transmits m(0) and m(1).
When in the two transmitting antennas of the transmitting apparatus, the first transmitting antenna is a vertical polarizing antenna (that is, the first transmitting antenna transmits a vertically polarized first modulated signal) and the second transmitting antenna is a vertical polarizing antenna (that is, the second transmitting antenna transmits a vertically polarized second modulated signal), the transmitting apparatus sets m(0)=1 and m(1)=0, and transmits m(0) and m(1).
When in the two transmitting antennas of the transmitting apparatus, the first transmitting antenna is a horizontal polarizing antenna (that is, the first transmitting antenna transmits a horizontally polarized first modulated signal) and the second transmitting antenna is a vertical polarizing antenna (that is, the second transmitting antenna transmits a vertically polarized second modulated signal), the transmitting apparatus sets m(0)=0 and m(1)=1, and transmits m(0) and m(1).
When in the two transmitting antennas of the transmitting apparatus, the first transmitting antenna is a vertical polarizing antenna (that is, the first transmitting antenna transmits a vertically polarized first modulated signal) and the second transmitting antenna is a horizontal polarizing antenna (that is, the second transmitting antenna transmits a horizontally polarized second modulated signal), the transmitting apparatus sets m(0)=1 and m(1)=1, and transmits m(0) and m(1).
Then, the transmitting apparatus transmits m(0) and m(1) with, for example, the first preamble in the frame configuring method in
The above describes the point that “there is also an advantage that it becomes unnecessary to perform signal processing for reception which has a small effect of obtaining a gain.” Supplemental description will be made on this point.
A case where the transmitting apparatus transmits modulated signals only with horizontally polarized waves and the receiving apparatus includes a horizontal polarizing receiving antenna and a vertical polarizing receiving antenna will be discussed. In this case, the modulated signals transmitted by the transmitting apparatus can be received at the horizontal polarizing receiving antenna of the receiving apparatus. However, the vertical polarizing receiving antenna of the receiving apparatus has very small reception field intensity of the modulated signals transmitted by the transmitting apparatus.
Hence, in such a case, when power consumed by the signal processing is considered, it is less necessary to perform an operation of performing signal processing on received signals received at the vertical polarizing receiving antenna of the receiving apparatus and obtaining data.
In view of the above, it is necessary for the transmitting apparatus to transmit “control information related to an antenna configuring method,” and for the receiving apparatus to perform accurate control.
Next, a case where the transmitting apparatus includes two or more horizontal polarizing antennas (however, it does not necessarily mean that the transmitting apparatus does not include a vertical polarizing antenna), or a case where the transmitting apparatus includes two or more vertical polarizing antennas (however, it does not necessarily mean that the transmitting apparatus does not include a horizontal polarizing antenna) will be described.
<Case where Transmitting Apparatus Includes Two or More Horizontal Polarizing Antennas>
In this case, when the transmitting apparatus transmits a single stream (the SISO transmitting method or the SIMO transmitting method), the transmitting apparatus transmits modulated signals from one or more horizontal polarizing antennas. In consideration of this case, when the transmitting apparatus transmits the first preamble including the control information related to the antenna configuring method described above, from one or more horizontal polarizing antennas, the receiving apparatus can receive the first preamble including the control information related to the antenna configuring method with a high gain, and, consequently, can obtain high data reception quality.
Then, the receiving apparatus obtains the control information related to the antenna configuring method, and thus the receiving apparatus can learn antenna configuration with which the transmitting apparatus has transmitted the MIMO transmitting method and the MISO transmitting method.
<Case where Transmitting Apparatus Includes Two or More Vertical Polarizing Antennas>
In this case, when the transmitting apparatus transmits a single stream (the SISO transmitting method or the SIMO transmitting method), the transmitting apparatus transmits modulated signals from one or more vertical polarizing antennas. In consideration of this case, when the transmitting apparatus transmits the first preamble including the control information related to the antenna configuring method described above, from one or more vertical polarizing antennas, the receiving apparatus can receive the first preamble including the control information related to the antenna configuring method with a high gain and, consequently, can obtain high data reception quality.
Then, the receiving apparatus obtains the control information related to the antenna configuring method, and thus the receiving apparatus can learn antenna configuration with which the transmitting apparatus has transmitted the MIMO transmitting method and the MISO transmitting method.
Next, a case where the transmitting apparatus includes a horizontal polarizing antenna and a vertical polarizing antenna will be described.
In this case, when the transmitting apparatus transmits a single stream (the SISO transmitting method or the SIMO transmitting method), it can be considered that the transmitting apparatus
a first method:
transmits modulated signals from the horizontal polarizing antenna and the vertical polarizing antenna,
a second method:
transmits modulated signals from the horizontal polarizing antenna,
a third method:
transmits modulated signals from the vertical polarizing antenna.
In this case, transmission from an antenna used for transmitting the first preamble including the control information related to the antenna configuring method described above is performed by the same method as in a case of transmission from an antenna used for transmitting a single stream (the SISO transmitting method or the SIMO transmitting method).
Hence, when modulated signals are transmitted by the first method in transmission of a single stream (the SISO transmitting method or the SIMO transmitting method), the first preamble including the control information related to the antenna configuring method is transmitted from the horizontal polarizing antenna and the vertical polarizing antenna.
When modulated signals are transmitted by the second method, the first preamble including the control information related to the antenna configuring method is transmitted from the horizontal polarizing antenna.
When modulated signals are transmitted by the third method, the first preamble including the control information related to the antenna configuring method is transmitted from the vertical polarizing antenna.
In this way, there is an advantage that the receiving apparatus can receive the first preamble in the same way as in receiving data symbol groups transmitted by the SISO method (it becomes unnecessary to change a signal processing method according to a transmitting method) (it is also possible to obtain the abovedescribed advantage).
Then, the receiving apparatus obtains the control information related to the antenna configuring method, and thus the receiving apparatus can learn antenna configuration with which the transmitting apparatus has transmitted the MIMO transmitting method and the MISO transmitting method.
As described above, the first preamble including the control information related to the antenna configuring method is transmitted, and thus the receiving apparatus can receive the first preamble with a high gain. Consequently, it is possible to obtain an effect of improvement in data symbol group reception quality, and it is possible to obtain an effect of enabling improvement in power efficiency of the receiving apparatus.
Note that the case where the control information related to the antenna configuring method is contained in the first preamble is described above as an example, but even when the control information related to the antenna configuring method is not contained in the first preamble, it is possible to obtain the same effect.
Then, the antenna used for transmitting the first preamble is highly likely to be determined during installation or maintenance of the transmitting apparatus, and a change in an antenna to be used during an operation can also be made, but such a change is less likely to be frequently made during a practical operation.
The example of a frame configuration in a modulated signal to be transmitted by the transmitting apparatus in
Similarly,
Then,
In this case, a number of carriers to be used in each data symbol group can be set. The number of symbol groups existing at every time is not limited to three. There only need to be two or more symbol groups.
Note that a data symbol group may also be a symbol group based on the MIMO (transmitting) method and the MISO (transmitting) method (as a matter of course, the data symbol group may be a symbol group of the SISO (SIMO) method). In this case, at the same time and the same (common) frequency, a plurality of streams (s1 and s2 described below) is transmitted. (In this case, at the same time and the same (common) frequency, a plurality of modulated signals is transmitted from a plurality of (different) antennas.) Then, this point is not limited to
Characteristic points in
Characteristic points in
A difference from
Then, control information related to data symbol groups #7 and #8 subjected to temporal division (for example, a number of symbols (or a time interval) which are necessary for each data symbol group, a method for modulating each data symbol group, a method for transmitting each data symbol group and a method of an error correction code to be used in each data symbol group) is transmitted with first preamble (501) and/or second preamble (502) in
When the control information is transmitted in this way, it becomes unnecessary to incorporate dedicated control information for the data symbol groups subjected to time division in first preamble 201 and second preamble 202, and also it becomes unnecessary to incorporate dedicated control information for data symbol groups subjected to frequency division in first preamble 501 and second preamble 502, and it is possible to realize data transmission efficiency of control information and simplification of control on control information of the receiving apparatus.
Characteristic points in
A difference between
Characteristic points in
In
For example, data symbol group #1 has symbols arranged from time t1 to time t2, and has a long time interval as compared to other data symbols. Data symbol groups other than data symbol group #1 also each have a time interval flexibly set.
Characteristic points in
Consequently, there is an effect of enabling symbol groups of different data reception quality to exist at the same time, and of enabling a flexible setting of a data transmission rate by appropriately defining data sections and frequency sections.
A difference of
Consequently, there is an effect of enabling symbol groups of different data reception quality to exist at the same time, and of enabling a flexible setting of a data transmission rate by appropriately defining data sections and frequency sections.
In this case, control information related to data symbol groups #1 to #8 subjected to frequency division (for example, a number of carriers and a time interval which are necessary for each data symbol group, a method for modulating each data symbol group, a method for transmitting each data symbol group and a method of an error correction code to be used in each data symbol group) is transmitted with first preamble (201) and/or second preamble (202) in
Then, control information related to data symbol groups #9 to #13 subjected to frequency division (for example, a number of carriers and a time interval which are necessary for each data symbol group, a method for modulating each data symbol group, a method for transmitting each data symbol group and a method of an error correction code to be used in each data symbol group) is transmitted with first preamble (501) and/or second preamble (502) in
Moreover, control information related to data symbol groups #14 and #15 subjected to temporal division (for example, a number of symbols (or a time interval) which is necessary for each data symbol group, a method for modulating each data symbol group, a method for transmitting each data symbol group and a method of an error correction code to be used in each data symbol group) is transmitted with first preamble (3601) and/or second preamble (3602) in
When the control information is transmitted in this way, it becomes unnecessary to incorporate dedicated control information for the data symbol groups subjected to time division in first preamble 201, second preamble 202, first preamble 501 and second preamble 502, and also it becomes unnecessary to incorporate dedicated control information for data symbol groups subjected to frequency division in first preamble 3601 and second preamble 3602, and it is possible to realize data transmission efficiency of control information and simplification of control on control information of the receiving apparatus.
A difference of
Consequently, there is an effect of enabling symbol groups of different data reception quality to exist at the same time, and of enabling a flexible setting of a data transmission rate by appropriately defining data sections and frequency sections. Moreover, an effect in a case of inserting a pilot symbol is as described in the first exemplary embodiment.
A difference of
Consequently, there is an effect of enabling symbol groups of different data reception quality to exist at the same time, and of enabling a flexible setting of a data transmission rate by appropriately defining data sections and frequency sections.
Then, as illustrated in
In the present exemplary embodiment, the examples of the frame configuration of the modulated signal to be transmitted by the transmitting apparatus are described with reference to
As illustrated in
Moreover, the “time division (temporal division) is performed” is not limited to the present exemplary embodiment, and the same interpretation also applies to the other exemplary embodiments.
As described in the first exemplary embodiment, the transmitting apparatus in
Then, the receiving apparatus (for example,
The method for transmitting data symbol groups #1 to #6 in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 to #6 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 to #6 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #7 and #8 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #7 and #8 is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a next “set of the first preamble and the second preamble” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission),” and in the method for transmitting a plurality of data symbol groups present between the “set of the first preamble and the second preamble” and the next “set of the first preamble and the second preamble,” there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission).
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, a fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Similarly, the method for transmitting data symbol groups #1 to #8 in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 to #8 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 to #8 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #9 to #13 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #9 to #13 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #14 and #15 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #14 and #15 is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a next “set of the first preamble and the second preamble” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission),” and in the method for transmitting a plurality of data symbol groups present between the “set of the first preamble and the second preamble” and the next “set of the first preamble and the second preamble,” there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission).
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Moreover, the method for transmitting data symbol groups #1 to #8 in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 to #6 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 to #6 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #7 and #8 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #7 and #8 is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a “pilot symbol” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission)” (there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission SISO transmission (SIMO transmission)). Then, a method for transmitting a plurality of data symbol groups present between the “pilot symbol” and a next “set of the first preamble and the second preamble” (however,
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Similarly, the method for transmitting data symbol groups #1 to #15 in the frame configuration in
In this case, either a case where the “method for transmitting data symbol groups #1 to #8 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #1 to #8 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #9 to #13 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #9 to #13 is of SISO transmission (SIMO transmission)” may be selectable, and either a case where the “method for transmitting data symbol groups #14 and #15 is of MIMO transmission or MISO transmission” or a case where the “method for transmitting data symbol groups #14 and #15 is of SISO transmission (SIMO transmission)” may be selectable.
That is, a method for transmitting a plurality of data symbol groups present between a “set of the first preamble and the second preamble” and a “pilot symbol” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission)” (there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission)). Then, a method for transmitting a plurality of data symbol groups present between the “pilot symbol” and a next “set of the first preamble and the second preamble” (however,
Moreover, a method for transmitting a plurality of data symbol groups present between a “pilot symbol” and a “pilot symbol” is of either “MIMO transmission or MISO transmission” or “SISO transmission (SIMO transmission)” (there is no mix of MIMO transmission and SISO transmission (SIMO transmission) and there is no mix of MISO transmission and SISO transmission (SIMO transmission)).
When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, fluctuation of received field intensity increases in the receiving apparatus. For this reason, there is a quantization error that is likely to occur during AD (AnalogtoDigital) conversion, and consequently, data reception quality may deteriorate. However, the abovedescribed way increases a possibility that an effect of suppression of occurrence of such a phenomenon and improvement in data reception quality can be obtained.
However, the present disclosure is not limited to the above.
Moreover, in association with the abovedescribed switching of the transmitting methods, methods for inserting a pilot symbol to be inserted to a data symbol group are also switched, and there is also an advantage from a viewpoint of improvement in data transmission efficiency (because there is no mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method). (When there is a mix of the SISO (SIMO) transmitting method and the MIMO (MISO) transmitting method, there is a possibility that frequency of inserting a pilot symbol becomes excessive and that the data transmission efficiency decreases.) Note that a configuration of a pilot symbol to be inserted to a data symbol group is as follows.
A “pilot symbol to be inserted to a data symbol group during SISO transmission” and a “pilot symbol to be inserted to a data symbol group during MIMO transmission or MISO transmission” are different in a pilot symbol configuring method. This point will be described with reference to the figures.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
Then, “first pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1” and “first pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2” are orthogonal (a correlation is zero) at a certain cycle.
Case of Modulated Signal #1:
First pilot symbol 4201 for modulated signal #1 and second pilot symbol 4202 for modulated signal #1 are inserted as illustrated in
Case of Modulated Signal #2:
First pilot symbol 4201 for modulated signal #2 and second pilot symbol 4202 for modulated signal #2 are inserted as illustrated in
The frame of a modulated signal to be transmitted by the transmitting apparatus in
In the present exemplary embodiment, an example of a method for configuring control information related to a frequency (frequency resources) and time (time resources) to be used by each data symbol group in a case of the frame configurations in
<Case where Frequency Division is Performed>
An example of a method for generating control information related to frequency resources and time resources to be used by each data symbol group in a case where frequency division is performed will be described.
An example of control information related to a frequency and time to be used by each data symbol group in this case will be described.
Control information related to a default position of a carrier to be used by data symbol group #j is ma, 0), m(j, 1), m(j, 2) and m(j, 3),
 control information related to a number of carriers to be used by data symbol group #j is n(j, 0), n(j, 1), n(j, 2) and n(j, 3),
 control information related to a default position of time to be used by data symbol group #j is o(j, 0), o(j, 1), o(j, 2) and o(j, 3), and
 control information related to a number of pieces of time to be used by data symbol group #j is p(j, 0), p(j, 1), p(j, 2) and p(j, 3).
In this case, when a default position of a carrier to be used by data symbol group #(j=K) is “carrier 1,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=0, m(K, 2)=0 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 2,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=0, m(K, 2)=0 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 3,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=1, m(K, 2)=0 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 4,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=1, m(K, 2)=0 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 5,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=0, m(K, 2)=1 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 6,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=0, m(K, 2)=1 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 7,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=1, m(K, 2)=1 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 8,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=1, m(K, 2)=1 and m(K, 3)=0, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 9,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=0, m(K, 2)=0 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 10,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=0, m(K, 2)=0 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 11,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=1, m(K, 2)=0 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 12,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=1, m(K, 2)=0 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 13,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=0, m(K, 2)=1 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 14,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=0, m(K, 2)=1 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 15,” the transmitting apparatus sets m(K, 0)=0, m(K, 1)=1, m(K, 2)=1 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 16,” the transmitting apparatus sets m(K, 0)=1, m(K, 1)=1, m(K, 2)=1 and m(K, 3)=1, and transmits m(K, 0), m(K, 1), m(K, 2) and m(K, 3).
When a number of carriers to be used by data symbol group #(j=K) is of 1 carrier, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=0, n(K, 2)=0 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 2 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=0, n(K, 2)=0 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 3 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=1, n(K, 2)=0 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 4 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=1, n(K, 2)=0 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 5 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=0, n(K, 2)=1 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 6 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=0, n(K, 2)=1 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 7 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=1, n(K, 2)=1 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 8 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=1, n(K, 2)=1 and n(K, 3)=0, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 9 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=0, n(K, 2)=0 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is, of 10 carriers the transmitting apparatus sets n(K, 0)=1, n(K, 1)=0, n(K, 2)=0 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is, of 11 carriers the transmitting apparatus sets n(K, 0)=0, n(K, 1)=1, n(K, 2)=0 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 12 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=1, n(K, 2)=0 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 13 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=0, n(K, 2)=1 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 14 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=0, n(K, 2)=1 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 15 carriers, the transmitting apparatus sets n(K, 0)=0, n(K, 1)=1, n(K, 2)=1 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When the number of carriers to be used by data symbol group #(j=K) is of 16 carriers, the transmitting apparatus sets n(K, 0)=1, n(K, 1)=1, n(K, 2)=1 and n(K, 3)=1, and transmits n(K, 0), n(K, 1), n(K, 2) and n(K, 3).
When a default position of time to be used by data symbol group #(j=K) is “time 1,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=0, o(K, 2)=0 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 2,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=0, o(K, 2)=0 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 3,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=1, o(K, 2)=0 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 4,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=1, o(K, 2)=0 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 5,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=0, o(K, 2)=1 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 6,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=0, o(K, 2)=1 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 7,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=1, o(K, 2)=1 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 8,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=1, o(K, 2)=1 and o(K, 3)=0, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 9,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=0, o(K, 2)=0 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 10,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=0, o(K, 2)=0 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 11,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=1, o(K, 2)=0 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 12,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=1, o(K, 2)=0 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 13,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=0, o(K, 2)=1 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 14,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=0, o(K, 2)=1 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 15,” the transmitting apparatus sets o(K, 0)=0, o(K, 1)=1, o(K, 2)=1 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When the default position of the time to be used by data symbol group #(j=K) is “time 16,” the transmitting apparatus sets o(K, 0)=1, o(K, 1)=1, o(K, 2)=1 and o(K, 3)=1, and transmits o(K, 0), o(K, 1), o(K, 2) and o(K, 3).
When a number of pieces of time to be used by data symbol group #(j=K) is 1, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=0, p(K, 2)=0 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 2, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=0, p(K, 2)=0 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 3, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=1, p(K, 2)=0 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 4, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=1, p(K, 2)=0 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 5, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=0, p(K, 2)=1 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 6, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=0, p(K, 2)=1 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 7, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=1, p(K, 2)=1 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 8, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=1, p(K, 2)=1 and p(K, 3)=0, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 9, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=0, p(K, 2)=0 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 10, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=0, p(K, 2)=0 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 11, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=1, p(K, 2)=0 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 12, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=1, p(K, 2)=0 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 13, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=0, p(K, 2)=1 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 14, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=0, p(K, 2)=1 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 15, the transmitting apparatus sets p(K, 0)=0, p(K, 1)=1, p(K, 2)=1 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 16, the transmitting apparatus sets p(K, 0)=1, p(K, 1)=1, p(K, 2)=1 and p(K, 3)=1, and transmits p(K, 0), p(K, 1), p(K, 2) and p(K, 3).
Next, data symbol group #3 will be described as an example.
Data symbol group #3 (4303) is transmitted by using carrier 10 to carrier 14 and by using time 1 to time 16.
As a result, a default position of a carrier is carrier 10. Hence, the transmitting apparatus sets m(3, 0)=1, m(3, 1)=0, m(3, 2)=0 and m(3, 3)=1, and transmits m(3, 0), m(3, 1), m(3, 2) and m(3, 3).
Moreover, a number of carriers to be used is 5. Hence, the transmitting apparatus sets n(3, 0)=0, n(3, 1)=0, n(3, 2)=1 and n(3, 3)=0, and transmits n(3, 0), n(3, 1), n(3, 2) and n(3, 3).
A default position of time is time 1. Hence, the transmitting apparatus sets o(3, 0)=0, o(3, 1)=0, o(3, 2)=0 and o(3, 3)=0, and transmits o(3, 0), o(3, 1), o(3, 2) and o(3, 3).
Moreover, a number of pieces of time to be used is 16. Hence, the transmitting apparatus sets p(3, 0)=1, p(3, 1)=1, p(3, 2)=1 and p(3, 3)=1, and transmits p(3, 0), p(3, 1), p(3, 2) and p(3, 3).
A difference of
When each data symbol group is allocated to a frame according to such rules, it is possible to reduce
 a number of bits of the abovedescribed “control information related to the default position of the carrier to be used by data symbol group #j,”
 a number of bits of the abovedescribed “control information related to the number of carriers to be used by data symbol group #j,”
 a number of bits of the abovedescribed “control information related to the default position of the time to be used by data symbol group #j,” and
 a number of bits of the abovedescribed “control information related to the number of pieces of time to be used by data symbol group #j,” and it is possible to improve data (information) transmission efficiency.
In this case, it is possible to define the control information as follows.
The control information related to the default position of the carrier to be used by data symbol group #j is m(j, 0) and m(j, 1),
 the control information related to the number of carriers to be used by data symbol group #j is n(j, 0) and n(j, 1),
 the control information related to the default position of the time to be used by data symbol group #j is o(j, 0) and o(j, 1), and
 the control information related to the number of pieces of time to be used by data symbol group #j is p(j, 0) and p(j, 1).
In this case, when a default position of a carrier to be used by data symbol group #(j=K) is “carrier 1,” the transmitting apparatus sets m(K, 0)=0 and m(K, 1)=0, and transmits m(K, 0) and m(K, 1).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 5,” the transmitting apparatus sets m(K, 0)=1 and m(K, 1)=0, and transmits m(K, 0) and m(K, 1).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 9,” the transmitting apparatus sets m(K, 0)=0 and m(K, 1)=1, and transmits m(K, 0) and m(K, 1).
When the default position of the carrier to be used by data symbol group #(j=K) is “carrier 13,” the transmitting apparatus sets m(K, 0)=1 and m(K, 1)=1, and transmits m(K, 0) and m(K, 1).
When a number of carriers to be used by data symbol group #(j=K) is of 4 carriers, the transmitting apparatus sets n(K, 0)=0 and n(K, 1)=0, and transmits n(K, 0) and n(K, 1).
When the number of carriers to be used by data symbol group #(j=K) is of 8 carriers, the transmitting apparatus sets n(K, 0)=1 and n(K, 1)=0, and transmits n(K, 0) and n(K, 1).
When the number of carriers to be used by data symbol group #(j=K) is of 12 carriers, the transmitting apparatus sets n(K, 0)=0 and n(K, 1)=1, and transmits n(K, 0) and n(K, 1).
When the number of carriers to be used by data symbol group #(j=K) is of 16 carriers, the transmitting apparatus sets n(K, 0)=1 and n(K, 1)=1, and transmits n(K, 0) and n(K, 1).
When a default position of time to be used by data symbol group #(j=K) is “time 1,” the transmitting apparatus sets o(K, 0)=0 and o(K, 1)=0, and transmits o(K, 0) and o(K, 1).
When the default position of the time to be used by data symbol group #(j=K) is “time 5,” the transmitting apparatus sets o(K, 0)=1 and o(K, 1)=0, and transmits o(K, 0) and o(K, 1).
When the default position of the time to be used by data symbol group #(j=K) is “time 9,” the transmitting apparatus sets o(K, 0)=0 and o(K, 1)=1, and transmits o(K, 0) and o(K, 1).
When the default position of the time to be used by data symbol group #(j=K) is “time 13,” the transmitting apparatus sets o(K, 0)=1 and o(K, 1)=1, and transmits o(K, 0) and o(K, 1).
When a number of pieces of time to be used by data symbol group #(j=K) is 4, the transmitting apparatus sets p(K, 0)=0 and p(K, 1)=0, and transmits p(K, 0) and p(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 8, the transmitting apparatus sets p(K, 0)=1 and p(K, 1)=0, and transmits p(K, 0) and p(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 12, the transmitting apparatus sets p(K, 0)=0 and p(K, 1)=1, and transmits p(K, 0) and p(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 16, the transmitting apparatus sets p(K, 0)=1 and p(K, 1)=1, and transmits p(K, 0) and p(K, 1).
Next, data symbol group #4 will be described as an example.
As a result, a default position of a carrier is carrier 9. Hence, the transmitting apparatus sets m(3, 0)=0 and m(3, 1)=1, and transmits m(3, 0) and m(3, 1).
Moreover, a number of carriers to be used is 4. Hence, the transmitting apparatus sets n(3, 0)=0 and n(3, 1)=0, and transmits n(3, 0) and n(3, 1).
A default position of time is time 5. Hence, the transmitting apparatus sets o(3, 0)=1 and o(3, 1)=0, and transmits o(3, 0) and o(3, 1).
Moreover, a number of pieces of time to be used is 8. Hence, the transmitting apparatus sets p(3, 0)=1 and p(3, 1)=0, and transmits p(3, 0) and p(3, 1).
A control information transmitting method which is different from the control information transmitting method of the second example when a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
In
Hence, area decomposition is performed as illustrated in
In
Area 4401 configured with carrier 5 to carrier 8 and time 1 to time 4 is referred to as area #1.
Area 4402 configured with carrier 9 to carrier 12 and time 1 to time 4 is referred to as area #2.
Area 4403 configured with carrier 13 to carrier 16 and time 1 to time 4 is referred to as area #3.
Area 4404 configured with carrier 1 to carrier 4 and time 5 to time 8 is referred to as area #4.
Area 4405 configured with carrier 5 to carrier 8 and time 5 to time 8 is referred to as area #5.
Area 4406 configured with carrier 9 to carrier 12 and time 5 to time 8 is referred to as area #6.
Area 4407 configured with carrier 13 to carrier 16 and time 5 to time 8 is referred to as area #7.
Area 4408 configured with carrier 1 to carrier 4 and time 9 to time 12 is referred to as area #8.
Area 4409 configured with carrier 5 to carrier 8 and time 9 to time 12 is referred to as area #9.
Area 4410 configured with carrier 9 to carrier 12 and time 9 to time 12 is referred to as area #10.
Area 4411 configured with carrier 13 to carrier 16 and time 9 to time 12 is referred to as area #11.
Area 4412 configured with carrier 1 to carrier 4 and time 13 to time 16 is referred to as area #12.
Area 4413 configured with carrier 5 to carrier 8 and time 13 to time 16 is referred to as area #13.
Area 4414 configured with carrier 9 to carrier 12 and time 13 to time 16 is referred to as area #14.
Area 4415 configured with carrier 13 to carrier 16 and time 13 to time 16 is referred to as area #15.
In this case, the transmitting apparatus in
When data symbol group #1 in
“area #0 (4400), area #1 (4401), area #4 (4404), area #5 (4405), area #8 (4408), area #9 (4409), area #12 (4412) and area #13 (4413) are used.”
In this case, the control information includes information of the areas (area #0 (4400), area #1 (4401), area #4 (4404), area #5 (4405), area #8 (4408), area #9 (4409), area #12 (4412) and area #13 (4413)).
Similarly, the transmitting apparatus in
In this case, the control information includes information of the area (area #2 (4402)).
The transmitting apparatus in
“area #3 (4403), area #7 (4407), area #11 (4411) and area #15 (4415) are used.” In this case, the control information includes information of the areas (area #3 (4403), area #7 (4407), area #11 (4411) and area #15 (4415)).
The transmitting apparatus in
“area #6 (4406) and area #10 (4410) are used.”
In this case, the control information includes information of the areas (area #6 (4406) and area #10 (4410)).
The transmitting apparatus in
“area #14 (4414) is used.”
In this case, the control information includes information of the area (area #14 (4414)).
As described above, in <second example> and <third example> there is an advantage that it is possible to transmit a small number of bits of information of time and frequency resources being used.
Meanwhile, in <first example> there is an advantage that it is possible to more flexibly allocate time and frequency resources to a data symbol group.
<Case where Time (Temporal) Division is Performed>
An example of generation of control information related to frequency resources and time resources to be used by each data symbol group in a case where time (temporal) division is performed will be described.
Even in a case where time (temporal) division is performed, control information is transmitted in the same way as a case where frequency division is performed. Hence, the abovedescribed <first example> is carried out.
Even in a case where time (temporal) division is performed, control information is transmitted in the same way as a case where frequency division is performed. Hence, the abovedescribed <second example> is carried out.
Even in a case where time (temporal) division is performed, control information is transmitted in the same way as a case where frequency division is performed. Hence, the abovedescribed <third example> is carried out.
e(X, Y) described in the second exemplary embodiment is transmitted as control information. That is, information related to a number of symbols in a frame of data symbol group #j is e(j, 0) and e(j, 1).
In this case, for example,
when a number of symbols in a frame of data symbol group #(j=K) is of 256 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 512 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=0 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 1024 symbols, the transmitting apparatus sets e(K, 0)=0 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
When the number of symbols in the frame of data symbol group #(j=K) is of 2048 symbols, the transmitting apparatus sets e(K, 0)=1 and e(K, 1)=1 and transmits e(K, 0) and e(K, 1).
Note that the setting of the number of symbols is not limited to the four settings, and the transmitting apparatus only needs to be able to set one or more types of the number of symbols.
The transmitting apparatus transmits information of a number of pieces of time to be necessary for each data symbol, to the receiving apparatus, and the receiving apparatus obtains this information and thus can learn frequency/time resources to be used by each data symbol.
For example, information related to a number of pieces of time to be used in a frame of data symbol group #j is q(j, 0), q(j, 1), q(j, 2) and q(j, 3).
When a number of pieces of time to be used by data symbol group #(j=K) is 1, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=0, q(K, 2)=0 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 2, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=0, q(K, 2)=0 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 3, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=1, q(K, 2)=0 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 4, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=1, q(K, 2)=0 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 5, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=0, q(K, 2)=1 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 6, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=0, q(K, 2)=1 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 7, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=1, q(K, 2)=1 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 8, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=1, q(K, 2)=1 and q(K, 3)=0, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 9, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=0, q(K, 2)=0 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 10, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=0, q(K, 2)=0 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 11, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=1, q(K, 2)=0 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 12, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=1, q(K, 2)=0 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 13, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=0, q(K, 2)=1 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 14, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=0, q(K, 2)=1 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 15, the transmitting apparatus sets q(K, 0)=0, q(K, 1)=1, q(K, 2)=1 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
When the number of pieces of time to be used by data symbol group #(j=K) is 16, the transmitting apparatus sets q(K, 0)=1, q(K, 1)=1, q(K, 2)=1 and q(K, 3)=1, and transmits q(K, 0), q(K, 1), q(K, 2) and q(K, 3).
In
For example, data symbol group #2 is transmitted by using time 5 to time 12, that is, a number of pieces of time is 8. Hence, the transmitting apparatus sets q(2, 0)=1, q(2, 1)=1, q(2, 2)=1, and q(2, 3)=0, and transmits q(2, 0), q(2, 1), q(2, 2) and q(2, 3).
Control information may also be generated for data symbol group #1 and data symbol #3 in the same way, and the transmitting apparatus in
The receiving apparatus in
Unlike <eighth example>, each data symbol group has, for example, a number of pieces of time of 4×B (B is a natural number equal to or more than 1) (the number of pieces of time to be used by each data symbol group is a multiple of 4 (but, except 0 (zero))). However, the number of pieces of time to be used by each data symbol group is not limited to a multiple of 4, and may be a multiple of D (D is an integer equal to or more than 2) except 0 (zero).
When each data symbol group is allocated to a frame according to such rules, it is possible to reduce
a number of bits of the abovedescribed “information related to the number of pieces of time to be used in the frame of data symbol group #j,” and it is possible to improve data (information) transmission efficiency.
In this case, it is possible to define the control information as follows.
The information related to the number of pieces of time to be used in the frame of data symbol group #j is q(j, 0) and q(j, 1).
When a number of pieces of time to be used by data symbol group #(j=K) is 4, the transmitting apparatus sets q(K, 0)=0 and q(K, 1)=0, and transmits q(K, 0) and q(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 8, the transmitting apparatus sets q(K, 0)=1 and q(K, 1)=0, and transmits q(K, 0) and q(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 12, the transmitting apparatus sets q(K, 0)=0 and q(K, 1)=1, and transmits q(K, 0) and q(K, 1).
When the number of pieces of time to be used by data symbol group #(j=K) is 16, the transmitting apparatus sets q(K, 0)=1 and q(K, 1)=1, and transmits q(K, 0) and q(K, 1).
For example, data symbol group #2 in
Control information may also be generated for data symbol group #1 and data symbol #3 in the same way, and the transmitting apparatus in
The receiving apparatus in
Unlike <eighth example>, each data symbol group has, for example, a number of pieces of time of 4×B (B is a natural number equal to or more than 1) (the number of pieces of time to be used by each data symbol group is a multiple of 4 (but, except 0 (zero))) (the same as in <ninth example> applies). However, the number of pieces of time to be used by each data symbol group is not limited to a multiple of 4, and may be a multiple of D (D is an integer equal to or more than 2) except 0 (zero).
Hence, area decomposition is performed as illustrated in
In
Area 4701 configured with time 5 to time 8 is referred to as area #1.
Area 4702 configured with time 9 to time 12 is referred to as area #2.
Area 4703 configured with time 13 to time 16 is referred to as area #3.
In this case, the transmitting apparatus in
When data symbol group #1 in
 “area #0 (4700) is used.”
In this case, the control information includes information of the area (area #0 (4700)).
 “area #0 (4700) is used.”
Similarly, the transmitting apparatus in
“area #1 (4701) and area #2 (4702) are used.”
In this case, the control information includes information of the areas (area #1 (4701) and area #2 (4702)).
The transmitting apparatus in
“area #3 (4703) is used.”
In this case, the control information includes information of the area (area #3 (4703)).
The control information during time (temporal) division is described in <fourth example> to <tenth example>. For example, when <fourth example>, <fifth example> and <sixth example> are used, the control information of frequency division and the control information during time (temporal) division can be configured in the same way.
Meanwhile, in a case of <seventh example> to <tenth example>, the transmitting apparatus transmits “control information related to use of time/frequency resources during frequency division, and control information related to use of time/frequency resources during time (temporal) division” having different configurations, by using the first preamble and/or the second preamble.
Note that for example, in a case of the frame configuration in
Similarly, in a case of the frame configuration in
Moreover, in a case of the frame configuration in
As described above, in <fifth example> <sixth example>, <ninth example> and <tenth example>, there is an advantage that it is possible to transmit a small number of bits of information of time/frequency resources being used.
Meanwhile, in <fourth example>, <seventh example> and <eighth example>, there is an advantage that it is possible to more flexibly allocate time/frequency resources to a data symbol group.
As in the examples described above, the transmitting apparatus transmits the control information related to use of the time/frequency resources during frequency division and the control information related to use of the time/frequency resources during time (temporal) division, and thus the receiving apparatus can learn a use status of the time/frequency resources of data symbol groups and can accurately demodulate/decode data.
Some examples of a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
A difference of
In
As illustrated in
For example, X=1 holds in
Similarly, X=2 holds in
Note that when there are, for example, carrier #1 to carrier #100 in a case where frequency division is performed as in
Next, an advantage in a case of the frame configuration in
In a case of the frame configuration in
In such a circumstance, when there is a terminal which needs only data symbol group #2, a frame configuration for enabling demodulation/decoding of data symbol group #2 only with a frequency band occupied by data symbol group #2 is desired in order to enable flexible terminal design, and in a case of the frame configuration in
When a frame is configured as in
Next, a case where a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
A difference of
In
As illustrated in
For example, X=1 holds in
Similarly, X=2 holds in
X=4 holds in
Note that when there are, for example, carrier #1 to carrier #100 in a case where frequency division is performed as in
Next, an advantage in a case of the frame configuration in
In a case of the frame configuration in
In such a circumstance, when there is a terminal which needs only data symbol group #2, a frame configuration for enabling demodulation/decoding of data symbol group #2 only with a frequency band occupied by data symbol group #2 is desired in order to enable flexible terminal design, and in a case of the frame configuration in
When a frame is configured as in
Next, a case where a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
A difference of
In
As illustrated in
For example, X=1 holds in
Similarly, X=2 holds in
Note that when there are, for example, carrier #1 to carrier #100 in a case where frequency division is performed as in
Next, an advantage in a case of the frame configuration in
In a case of the frame configuration in
In such a circumstance, when there is a terminal which needs only data symbol group #2, a frame configuration for enabling demodulation/decoding of data symbol group #2 only with a frequency band occupied by data symbol group #2 is desired in order to enable flexible terminal design, and in a case of the frame configuration in
When a frame is configured as in
Next, a case where a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
A difference of
However, the control information symbols are not necessarily arranged on all of data symbol group #1 (3001), data symbol group #2 (3002), data symbol group #3 (3003), data symbol group #4 (3004), data symbol group #5 (3005) and data symbol group #6 (3006) in the frequency direction. This point will be described with reference to
When there are, for example, carrier #1 to carrier #100 in a case where frequency division is performed as in
Next, an advantage in a case of the frame configuration in
In a case of the frame configuration in
In such a circumstance, when there is a terminal which needs only data symbol group #2, a frame configuration for enabling demodulation/decoding of data symbol group #2 only with a frequency band occupied by data symbol group #2 is desired in order to enable flexible terminal design, and in a case of the frame configuration in
When a frame is configured as in
Next, a case where a frame configuration of a modulated signal to be transmitted by the transmitting apparatus in
A difference of
However, control information symbols are not necessarily arranged on all of data symbol group #1 (3401), data symbol group #2 (3402), data symbol group #3 (3403), data symbol group #4 (3404), data symbol group #5 (3405), data symbol group #6 (3406), data symbol group #7 (3407), data symbol group #8 (3408), data symbol group #9 (3509), data symbol group #10 (3510), data symbol group #11 (3511), data symbol group #12 (3512), and data symbol group #13 (3513) in the frequency direction. This point will be described with reference to
When there are, for example, carrier #1 to carrier #100 in a case where frequency division is performed as in
Next, an advantage in a case of the frame configuration in
In a case of the frame configuration in
In such a circumstance, when there is a terminal which needs only data symbol group #2, a frame configuration for enabling demodulation/decoding of data symbol group #2 only with a frequency band occupied by data symbol group #2 is desired in order to enable flexible terminal design, and in a case of the frame configuration in
When a frame is configured as in
As in the abovedescribed example, when a data symbol group is arranged by using frequency division, control information symbols are arranged in the frequency direction, and thus it is possible to obtain an effect of enabling flexible terminal design. Note that the control information symbols related to a data symbol group arranged by using time (temporal) division are contained in the first preamble and the second preamble as illustrated in
Note that control information related to a data symbol group subjected to frequency division may be contained in the first preamble and the second preamble, or control information related to a data symbol group subjected to time (temporal) division may be contained in control information symbols (4904, 4905, 5304 and 5305) illustrated in
The case where phase change is performed on a modulated signal is described in the first exemplary embodiment to the sixth exemplary embodiment (the first exemplary embodiment in particular). In the present exemplary embodiment, a method for performing phase change on a data symbol group subjected to frequency division will be described in particular.
The first exemplary embodiment describes the phase change that is performed on both of baseband signal s1(t) (s1(i)) and baseband signal s2(t) (s2(i)) or one of baseband signal s1(t) (s1(i)) and baseband signal s2(t) (s2(i)). As features of the present method, phase change is not performed on, for example, pilot symbols (a reference symbol, a unique word and a postamble), a first preamble, a second preamble and control information symbols other than symbols for transmitting baseband signal s1(t) and baseband signal s2(t) in a transmission frame.
Then, there are the following cases in a method for performing phase change on a data symbol group subjected to frequency division, which includes “performing phase change on both of baseband signal s1(t) (s1(i)) and baseband signal s2(t) (s2(i)) or one of baseband signal s1(t) (s1(i)) and baseband signal s2(t) (s2(i)).”
First Case:
A first case will be described with reference to
In
Part (A) of
In the data symbol groups in
In symbols of data symbol group #1 in area 5501 in (A) of
Moreover, there is a symbol described as “#1 $1.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 5502 in (A) of
Moreover, there is a symbol described as “%1 $1.” In this case, “% 1” means a “1st symbol” of data symbol group #2. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “% X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #1 in area 5503 in (B) of
Moreover, there is a symbol described as “#1 $1.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 5504 in (B) of
Moreover, there is a symbol described as “%1 $1.” In this case, “% 1” means a “1st symbol” of data symbol group #2. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “% X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “$Y” means performing phase change of “phase change $Y.”
In this case, 7 cycles of phase change are performed in a data symbol of modulated signal z1. For example, “phase change of (2×0 π)/14 radians is performed as phase change $0,” “phase change of (2×1×π)/14 radians is performed as phase change $1,” “phase change of (2×2×π)/14 radians is performed as phase change $2,” “phase change of (2×3×π)/14 radians is performed as phase change $3,” “phase change of (2×4×π)/14 radians is performed as phase change $4,” “phase change of (2×5×π)/14 radians is performed as phase change $5,” and “phase change of (2×6×π)/14 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
Then, 7 cycles of phase change are performed in a data symbol of modulated signal z2. For example, “phase change of −(2×0×π)/14 radians is performed as phase change $0,” “phase change of −(2×1×π)/14 radians is performed as phase change $1,” “phase change of −(2×2×π)/14 radians is performed as phase change $2,” “phase change of −(2×3×π)/14 radians is performed as phase change $3,” “phase change of −(2×4×π)/14 radians is performed as phase change $4,” “phase change of −(2×5×π)/14 radians is performed as phase change $5,” and “phase change of −(2×6×π)/14 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
(Note that as described above, phase change may be performed on modulated signal z1, and may not be performed on modulated signal z2. Moreover, phase change may not be performed on modulated signal z1, and phase change may be performed on modulated signal z2).
Features of the first case are such that “7 cycles of phase change are performed in data symbol group #1 together with data symbol group #2” (that is, 7 cycles of phase change are performed in data symbols of an entire frame, regardless of a belonging data symbol group).
Second Case:
A second case will be described with reference to
In
Part (A) of
In data symbol group #1 in
In symbols of data symbol group #1 in area 5501 in (A) of
Moreover, there is a symbol described as “#1 $1.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 5502 in (A) of
Moreover, there is a symbol described as “%1 ♭1.” In this case, “%1” means a “1st symbol” of data symbol group #2. Then, “♭1” means performing phase change of “phase change ♭1.”
Hence, there are symbols described as “% X ♭Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 4). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “♭Y” means performing phase change of “phase change ♭Y.”
In symbols of data symbol group #1 in area 5503 in (B) of
Moreover, there is a symbol described as “#1 $1.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 5504 in (B) of
Moreover, there is a symbol described as “%1 ♭1.” In this case, “%1” means a “1st symbol” of data symbol group #2. Then, “hi” means performing phase change of “phase change ♭1.”
Hence, there are symbols described as “% X ♭Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 4). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “♭Y” means performing phase change of “phase change ♭Y.”
In this case, 7 cycles of phase change are performed in data symbol group #1 of modulated signal z1. For example, “phase change of (2×0×π)/14 radians is performed as phase change $0,” “phase change of (2×1×π)/14 radians is performed as phase change $1,” “phase change of (2×2×π)/14 radians is performed as phase change $2,” “phase change of (2×3×π)/14 radians is performed as phase change $3,” “phase change of (2×4×π)/14 radians is performed as phase change $4,” “phase change of (2×5×π)/14 radians is performed as phase change $5,” and “phase change of (2×6×π)/14 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
Then, 7 cycles of phase change are performed in data symbol group #1 of modulated signal z2. For example, “phase change of −(2×0×π)/14 radians is performed as phase change $0,” “phase change of −(2×1×π)/14 radians is performed as phase change $1,” “phase change of −(2×2×π)/14 radians is performed as phase change $2,” “phase change of −(2×3×π)/14 radians is performed as phase change $3,” “phase change of −(2×4×π)/14 radians is performed as phase change $4,” “phase change of −(2×5×π)/14 radians is performed as phase change $5,” and “phase change of −(2×6×π)/14 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
(Note that as described above, phase change may be performed in data symbol group #1 of modulated signal z1, and may not be performed in data symbol group #1 of modulated signal z2. Moreover, phase change may not be performed in data symbol group #1 of modulated signal z1, and phase change may be performed in data symbol group #1 of modulated signal z2.)
Then, 5 cycles of phase change are performed in data symbol group #2 of modulated signal z1. For example, “phase change of (2×0×π)/10 radians is performed as phase change ♭0,” “phase change of (2×1×π)/10 radians is performed as phase change ♭1,” “phase change of (2×2×π)/10 radians is performed as phase change ♭2,” “phase change of (2×3×π)/10 radians is performed as phase change ♭3,” and “phase change of (2×4×π)/10 radians is performed as phase change ♭4” (however, a phase change value is not limited to these values).
Then, 5 cycles of phase change are performed in data symbol group #2 of modulated signal z2. For example, “phase change of −(2×0×π)/10 radians is performed as phase change ♭0,” “phase change of −(2×1×π)/10 radians is performed as phase change ♭1,” “phase change of −(2×2×π)/10 radians is performed as phase change ♭2,” “phase change of −(2×3×π)/10 radians is performed as phase change ♭3,” and “phase change of −(2×4×π)/10 radians is performed as phase change ♭4” (however, a phase change value is not limited to these values).
(Note that as described above, phase change may be performed in data symbol group #2 of modulated signal z1, and may not be performed in data symbol group #2 of modulated signal z2. Moreover, phase change may not be performed in data symbol group #2 of modulated signal z1, and phase change may be performed in data symbol group #2 of modulated signal z2).
Features of the second case are such that “7 cycles of phase change are performed in data symbol group #1, and also 5 cycles of phase change are performed in data symbol group #2” (that is, unique phase change is performed in each data symbol group. However, the same phase change may be performed in different data symbols).
Third Case:
Hence, terminal #3 (5703) receives both of the modulated signal transmitted by transmission station #1 and the modulated signal transmitted by transmission station #2 in frequency band A, and demodulates/decodes data.
Error correction encoder 5802 receives an input of information 5801 and signal 5813 related to a transmitting method. Error correction encoder 5802 performs error correction coding based on information related to an error correction coding method and contained in signal 5813 related to the transmitting method. Error correction encoder 5802 outputs data 5803.
Mapper 5804 receives an input of data 5803 and signal 5813 related to the transmitting method. Mapper 5804 performs mapping based on information related to the modulating method and contained in signal 5813 related to the transmitting method. Mapper 5804 outputs baseband signal 5805 (s1(t, f)) (note that data interleaving (data order rearrangement) may be performed between error correction encoder 5802 and mapper 5804).
Control information symbol generator 5807 receives an input of control information 5806, and information 5813 related to the transmitting method. Control information symbol generator 5807 generates a control information symbol based on information related to the transmitting method and contained in signal 5813 related to the transmitting method. Control information symbol generator 5807 outputs baseband signal 5808 of the control information symbol.
Pilot symbol generator 5809 receives an input of signal 5813 related to the transmitting method. Pilot symbol generator 5809 generates a pilot symbol based on signal 5813. Pilot symbol generator 5809 outputs baseband signal 5810 of a pilot symbol.
Transmitting method instructing unit 5812 receives an input of transmitting method instruction information 5811. Transmitting method instructing unit 5812 generates and outputs signal 5813 related to the transmitting method.
Phase changer 5814 receives an input of baseband signal 5805 (s1(t, f)), baseband signal 5808 of the control information symbol, baseband signal 5810 of the pilot symbol, and signal 5813 related to the transmitting method. Phase changer 5814 performs phase change based on information of a frame configuration contained in signal 5813 related to the transmitting method, and based on information related to phase change. Phase changer 5814 outputs baseband signal 5815 based on a frame configuration. Note that details will be described below with reference to
Radio unit 5816 receives an input of baseband signal 5815 based on the frame configuration, and signal 5813 related to the transmitting method. Radio unit 5816 performs processing such as interleaving, inverse Fourier transform and frequency conversion based on signal 5813 related to the transmitting method. Radio unit 5816 generates and outputs transmission signal 5817. Transmission signal 5817 is output as a radio wave from antenna 5818.
In a frame in
In symbols of data symbol group #1 in area 5901 in
Moreover, there is a symbol described as “#1 $2.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$2” means performing phase change of “phase change $2.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 5902 in
Moreover, there is a symbol described as “%1 $4.” In this case, “% 1” means a “1st symbol” of data symbol group #2. Then, “$4” means performing phase change of “phase change $4.”
Hence, there are symbols described as “% X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “$Y” means performing phase change of “phase change $Y.”
Moreover, in
Hence, there are symbols described as “C $Y” (Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “C” means a control information symbol, and “$Y” means performing phase change of “phase change $Y.”
Moreover, in
Hence, there are symbols described as “P $Y” (Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “P” means a pilot symbol, and “$Y” means performing phase change of “phase change $Y.”
In this case, 7 cycles of phase change are performed in a data symbol of a modulated signal. For example, “phase change of (2×0×π)/7 radians is performed as phase change $0,” “phase change of (2×1×π)/7 radians is performed as phase change $1,” “phase change of (2×2×π)/7 radians is performed as phase change $2,” “phase change of (2×3×π)/7 radians is performed as phase change $3,” “phase change of (2×4×π)/7 radians is performed as phase change $4,” “phase change of (2×5×π)/7 radians is performed as phase change $5,” and “phase change of (2×6×π)/7 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
Note that in modulated signal #1 to be transmitted by transmission station #1 (5701) and modulated signal #2 to be transmitted by transmission station #2 (5702) in
In a frame in
In symbols of data symbol group #1 in area 6001 in
Moreover, there is a symbol described as “#1 $1.” In this case, “#1” means a “1st symbol” of data symbol group #1. Then, “$1” means performing phase change of “phase change $1.”
Hence, there are symbols described as “#X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “#X” means an “Xth symbol” of data symbol group #1. Then, “$Y” means performing phase change of “phase change $Y.”
In symbols of data symbol group #2 in area 6002 in
Moreover, there is a symbol described as “%1 $3.” In this case, “% 1” means a “1st symbol” of data symbol group #2. Then, “$3” means performing phase change of “phase change $3.”
Hence, there are symbols described as “% X $Y” (X is an integer equal to or more than 0, and Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “% X” means an “Xth symbol” of data symbol group #2. Then, “$Y” means performing phase change of “phase change $Y.”
Moreover, in
Hence, there are symbols described as “C $Y” (Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “C” means a control information symbol, and “$Y” means performing phase change of “phase change $ Y.”
Moreover, in
Hence, there are symbols described as “P $Y” (Y is an integer equal to or more than 0 and equal to or less than 6). In this case, “P” means a pilot symbol, and “$Y” means performing phase change of “phase change $Y.”
In this case, 7 cycles of phase change are performed in a data symbol of a modulated signal. For example, “phase change of (2×0×π)/7 radians is performed as phase change $0,” “phase change of (2×1×π)/7 radians is performed as phase change $1,” “phase change of (2×2×π)/7 radians is performed as phase change $2,” “phase change of (2×3×π)/7 radians is performed as phase change $3,” “phase change of (2×4×π)/7 radians is performed as phase change $4,” “phase change of (2×5×π)/7 radians is performed as phase change $5,” and “phase change of (2×6×π)/7 radians is performed as phase change $6” (however, a phase change value is not limited to these values).
Note that in modulated signal #1 to be transmitted by transmission station #1 (5701) and modulated signal #2 to be transmitted by transmission station #2 (5702) in
Moreover, when phase change is performed for each symbol in
Note that the configuration of transmission stations #1 and #2 in
Elements operating in the same way as in
Features of the third case are such that “7 cycles of phase change are performed in data symbol group #1 together with data symbol group #2 and symbols other than data symbols (the symbols other than data symbols are control information symbols and pilot symbols in a case of
For example, the transmitting apparatus (transmission station) in
As described above, the transmitting apparatus can favorably obtain a diversity effect in each data symbol group by carrying out an appropriate phase change method in each transmitting method. For this reason, the receiving apparatus can obtain an effect of making it possible to obtain good data reception quality.
Note that as a matter of course, the transmitting apparatus (transmission station) may carry out any of the abovedescribed first case, second case and third case alone.
Preambles are transmitted in a period from time t0 to time t1, symbol groups subjected to time division (time division multiplexing (TDM)) are transmitted in a period from time t1 to time t2, and symbol groups subjected to timefrequency division multiplexing (TFDM) are transmitted in a period from time t2 to time t3.
In the case of TDM, the number of symbols (or slots) included in each data symbol group #TDX is the number of symbols (or slots) in which data corresponding to an integral multiple of an FEC block (having a block length of an error correction code (a code length of an error correction code)) is fitted.
For example, when the block length of an error correction code is 64800 bits and the number of bits for transmitting each symbol of a data symbol group is 4 (the number of bits for transmitting each symbol is 4 when the singleinput singleoutput (SISO) method and 16QAM are used), the number of symbols necessary to transmit 64800 bits that indicate the block length of the error correction code is 16200 symbols. Accordingly, in such a case, the number of symbols of data symbol group #TDX is 16200×N (N is an integer greater than or equal to 1).
In another example, when the block length of an error correction code is 64800 bits and the number of bits for transmitting each symbol of a data symbol group is 6 (when the SISO method and 64QAM are used, the number of bits for transmitting each symbol is 6), the number of symbols necessary to transmit 64800 bits that indicate the block length of the error correction code is 10800 symbols. Accordingly, in such a case, the number of symbols of data symbol group #TDX is 10800×N (N is an integer greater than or equal to 1).
In yet another example, when the block length of an error correction code is 64800 bits, and the number of bits for transmitting each slot of a data symbol group is 8 (when the MIMO method is used, the modulation method for stream 1 is 16QAM, and the modulation method for stream 2 is 16QAM, the number of bits for transmitting each slot which includes one symbol of stream 1 and one symbol of stream 2 is 8), the number of slots necessary to transmit 64800 bits that indicate the block length of the error correction code is 8100. Accordingly, in such a case, the number of slots of data symbol group #TDX is 8100×N (N is an integer greater than or equal to 1).
Among symbol groups subjected to time division in a period from time t1 to time t2 in
In
For example, with regard to data symbol group #TD1, the arrangement of data symbols starts from “time $1, carrier 1”, and subsequently, data symbols are arranged at “time $1, carrier 2”, “time $1, carrier 3”, “time $1, carrier 4”, . . . , “time $1, carrier 63”, “time $1, carrier 64”, “time $2, carrier 1”, “time $2, carrier 2”, “time $2, carrier 3”, “time $2, carrier 4”, . . . , “time $2, carrier 63”, “time $2, carrier 64”, “time $3, carrier 1”, and so on.
With regard to data symbol group #TD3, the arrangement of data symbols starts from “time $6000, carrier 1”, and subsequently data symbols are arranged at “time $6000, carrier 2”, “time $6000, carrier 3”, “time $6000, carrier 4”, . . . , “time $6000, carrier 63”, “time $6000, carrier 64”, “time $6001, carrier 1”, “time $6001, carrier 2”, “time $6001, carrier 3”, “time $6001, carrier 4”, . . . , “time $6001, carrier 63”, “time $6001, carrier 64”, “time $6002, carrier 1”, and so on, and the arrangement of symbols is completed when a symbol is arranged at “time $7000, carrier 20.”
Then, with regard to data symbol group #TD4, the arrangement of data symbols starts from “time $7000, carrier 21.”
Furthermore, data symbols in data symbol groups #TD4 and TD#5 are arranged in accordance with the same rule, and the last symbol of data symbol group #TD5 which is the last data symbol group is arranged at time $10000 at carrier 32.
Then, dummy symbols are arranged at carriers from carrier 33 to carrier 64 at time $10000. Accordingly, symbols at carrier 1 to carrier 64 are to be transmitted also at time $10000. Note that each of the dummy symbols has a certain value for inphase component I and also a certain value for quadrature component Q.
For example, inphase component I of a dummy symbol may be generated using a pseudorandom sequence which includes “0” and “1”, and quadrature component Q of the dummy symbol may be 0. In this case, a pseudorandom sequence is initialized at a position of a first dummy symbol, and inphase component I may be converted into one of the values+1 and −1, based on inphase component I=2 (½−pseudorandom sequence).
Alternatively, quadrature component Q of a dummy symbol may be generated using a pseudorandom sequence which includes “0” and “1”, and quadrature component I of the dummy symbol may be 0. In this case, a pseudorandom sequence is initialized at a position of a first dummy symbol, and quadrature component Q may be converted into one of the values+1 and −1, based on quadrature component Q=2 (½−pseudorandom sequence).
Furthermore, an inphase component of a dummy symbol may be set to a real number other than zero, and a quadrature component of the dummy symbol may be set to a real number other than zero.
A method for generating a dummy symbol is not limited to the above. The description with regard to a dummy symbol here is also applicable to dummy symbols later described.
According to the above rule, dummy symbols are arranged in a time section (from time t1 to time t2 in
The timefrequency division multiplexing (TFDM) method is to be described with reference to
A period from time t2 to time t3 in
At time $10001, data symbol group #TFD1 (3401) and data symbol #TFD2 (3402) are subjected to frequency division multiplexing, and data symbol group #TFD2 (3402), data symbol group #TFD3 (3403), and data symbol group #TFD6 (3406) are subjected to time division multiplexing at carrier 11. Accordingly, a period from time t2 to time t3 includes a portion on which frequency division is performed and a portion on which time division multiplexing is performed, and thus the method is named “timefrequency division multiplexing”, here.
Data symbol group #TFD1 (3401) is present at time $10001 to time $14000, i is greater than or equal to 10001 and less than or equal to 14000, and data symbols are present at carrier 1 to carrier 10 at time i which satisfies the above.
Data symbol group #TFD2 (3402) is present at time $10001 to time $11000, i is greater than or equal to 10001 and less than or equal to 11000, and data symbols are present at carrier 11 to carrier 64 at time i which satisfies the above.
Data symbol group #TFD3 (3403) is present at time $11001 to time $13000, i is greater than or equal to 11001 and less than or equal to 13000, and data symbols are present at carrier 11 to carrier 35 at time i which satisfies the above.
Data symbol group #TFD4 (3404) is present at time $11001 to time $12000, i is greater than or equal to 11001 and less than or equal to 12000, and data symbols are present at carrier 36 to carrier 64 at time i which satisfies the above.
Data symbol group #TFD5 (3405) is present at time $12001 to time $13000, i is greater than or equal to 12001 and less than or equal to 13000, and data symbols are present at carrier 36 to carrier 64 at time i which satisfies the above.
Data symbol group #TFD6 (3406) is present at time $13001 to time $14000, i is greater than or equal to 13001 and less than or equal to 14000, and data symbols are present at carrier 11 to carrier 30 at time i which satisfies the above.
Data symbol group #TFD7 (3407) is present at time $13001 to time $14000, i is greater than or equal to 13001 and less than or equal to 14000, and data symbol are present at carrier 31 to carrier 50 at time i which satisfies the above.
Data symbol group #TFD8 (3408) is present at time $13001 to time $14000, i is greater than or equal to 13001 and less than or equal to 14000, and data symbols are present at carrier 51 to carrier 64 at time i which satisfies the above.
The timefrequency division multiplexing method has a feature that the carrier number of an occupied carrier is the same for a data symbol group in all the time sections in which data symbols of the data symbol group are present.
The number of symbols (or the number of slots) included in data symbol group #TFDX is U. U is an integer greater than or equal to 1.
First, “V (which is an integer greater than or equal to 1) which denotes the number of symbols (or the number of slots) in which data having an integral multiple of a block length of an error correction code (a code length of an error correction code) is fitted” is secured. Note that U−α+1≤V≤U is to be satisfied (a denotes the number of symbols (or the number of slots) necessary to transmit a block having a block length (a code length) of an error correction code (unit: bits), and is an integer greater than or equal to 1).
When U−V≠0, dummy symbols (or dummy slots) of U−V symbols (or U−V slots) are added. Thus, data symbol group #TFDX includes data symbols that are V symbols (or V slots) and dummy symbols that are U−V symbols (or U−V slots) (each dummy symbol has a certain value for inphase component I, and also a certain value for quadrature component Q).
All the data symbol groups subjected to timefrequency division multiplexing each satisfy that “a data symbol group includes data symbols that are V symbols (or V slots) and dummy symbols that are U−V symbols (or U−V slots)”.
Specifically, when data symbol groups subjected to timefrequency division multiplexing needs to have dummy symbols (or dummy slots), dummy symbols (dummy slots) are inserted in data symbol groups separately.
In data symbol group #TFD1 (3401), data symbols are arranged preferentially from a position having a smaller time index. A rule that if data symbols are arranged at all the occupied carriers at a certain time, data symbols are arranged at carriers at a time subsequent to the certain time is adopted.
For example, with regard to data symbol group #TFD1 (3401), a data symbol is arranged at carrier 1 at time $10001, and thereafter data symbols are arranged at carrier 2 at time $10001, carrier 3 at time $10001, . . . , carrier 9 at time $10001, and carrier 10 at time $10001, as illustrated in
With regard to data symbol arrangement at time $13995, data symbols are arranged at carrier 1 at time $13995, carrier 2 at time $13995, carrier 3 at time $13995, carrier 4 at time $13995, carrier 5 at time $13995, and carrier 6 at time $13995. This completes arrangement of data symbols.
However, there are symbols as data symbol group #TFD1 (3401) at carrier 7, carrier 8, carrier 9, and carrier 10 at time $13995, carrier 1 to carrier 10 at time $13996, carrier 1 to carrier 10 at time $13997, carrier 1 to carrier 10 at time $13998, carrier 1 to carrier 10 at time $13999, and carrier 1 to carrier 10 at time $14000. Thus, dummy symbols are arranged at carrier 7, carrier 8, carrier 9, and carrier 10 at time $13995, carrier 1 to carrier 10 at time $13996, carrier 1 to carrier 10 at time $13997, carrier 1 to carrier 10 at time $13998, carrier 1 to carrier 10 at time $13999, and carrier 1 to carrier 10 at time $14000.
Following the same method as described above, dummy symbols are arranged if necessary also in data symbol group #TFD2 (3402), data symbol group #TFD3 (3403), data symbol group #TFD4 (3404), data symbol group #TFD5 (3405), data symbol group #TFD6 (3406), data symbol group #TFD7 (3407), and data symbol group #TFD8 (3408) in
As described above, dummy symbols are inserted using different methods for a frame subjected to time division multiplexing and a frame subjected to timefrequency division multiplexing, and thus a receiving apparatus can readily sort out data symbols, and demodulate/decode data. Furthermore, an advantageous effect of preventing fall of a data transmission rate due to dummy symbols can be achieved.
Note that a frame configuration in which “preambles”, “symbols subjected to time division”, and “symbols subjected to timefrequency division” are arranged in this order along the time axis is described based on the example in