Framing modulation method for multimedia movable broadcast signals
Framing modulation method for multimedia movable broadcast signals
 CN 103,763,256 A
 Filed: 01/13/2014
 Published: 04/30/2014
 Est. Priority Date: 01/13/2014
 Status: Active Application
First Claim
1. a multimedia mobile broadcast signal framing modulation method, is characterized in that it comprises the following steps:
 1) Multimedia Mobile broadcast signal transmission machine is deleted the input data bit of oneself the serially concatenated multi code Rate of Chinese character of flowing through the modulation of remaining convolutional encoding, code element and code element and is rotated in and on frequency domain, forms FFT coded data block, the length of FFT coded data block is K, and the numerical value of K is got even number;
Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping;
Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;
2) Multimedia Mobile broadcast signal transmission machine adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D _{total}=[d _{0}, d _{1}..., d _{k2}, d _{k1}];
3) Multimedia Mobile broadcast signal transmission machine is by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete coded data sample value successively separated strange subblock D of time domain discrete coded data sample value that generates _{very}=[d _{0}, d _{2}..., d _{k4}, d _{k2}] and the even subblock D of time domain discrete coded data sample value _{even}=[d _{1}, d _{3}..., d _{k3}, d _{k1}];
4) Multimedia Mobile broadcast signal transmission machine passes through peaktoaverage power ratio adjustment unit to the strange subblock D of time domain discrete coded data sample value _{very}, the even subblock D of time domain discrete coded data sample value _{even}carry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again _{new}, new time domain discrete coded data sample value piece D _{new}adopt following generate pattern to obtain, generate pattern 1 is D _{new}=[D _{very}, D _{even}], generate pattern 2 is , generate pattern 3 is , generate pattern 4 is , generate pattern 5 is , generate pattern 6 is , generate pattern 7 is D _{new}=[D ^{*}_{very}, D _{even}], generate pattern 8 is generate pattern 9 is , generate pattern 10 is , generate pattern 11 is , generate pattern 12 is , generate pattern 13 is D _{new}=[D _{very}, D ^{*}_{even}], generate pattern 14 is , generate pattern 15 is , generate pattern 16 is , generate pattern 17 is , generate pattern 18 is , compare 18 kinds of time domain discrete coded data sample value piece D that generate pattern is synthetic _{new}, choose wherein there is minimum peaktoaverage power ratio peaktoaverage power ratio time domain discrete coded data sample value piece falls , and peaktoaverage power ratio time domain discrete coded data sample value piece will fall the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D ^{*}_{very}expression is to the strange subblock D of time domain discrete coded data sample value _{very}each time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value subblock that obtains;
D ^{*}_{even}expression is to the even subblock D of time domain discrete coded data sample value _{even}each time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value subblock that obtains;
5) Multimedia Mobile broadcast signal transmission machine Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing Multimedia Mobile broadcast signal transmission machine;
Time domain embeds the length and the length numerically equal of falling peaktoaverage power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;
6) Multimedia Mobile broadcast signal transmission machine will fall peaktoaverage power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peaktoaverage power ratio time domain discrete coded data sample value piece, as frame;
7) Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall peaktoaverage power ratio time domain discrete coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C;
8) Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
9) Multimedia Mobile broadcast signal transmission machine by baseband signal upconversion to carrier wave.
Abstract
The invention discloses a framing modulation method for multimedia movable broadcast signals, and relates to a mixed framing modulation scheme of the time domain and the frequency domain. According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the framing modulation method for the multimedia movable broadcast signals, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals. The framing modulation method for the multimedia movable broadcast signals has the advantages of being low in peaktoaverage power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like.

10 Citations
Apparatus and method for reducing peak to average power ratio in a signal  
Patent #
US 10,880,144 B2
Filed 12/13/2019

Current Assignee
N/A

Apparatus and method for reducing peak to average power ratio in a signal  
Patent #
US 10,554,463 B2
Filed 05/02/2019

Current Assignee
N/A

Apparatus and method for reducing peak to average power ratio in a signal  
Patent #
US 10,333,756 B2
Filed 04/28/2016

Current Assignee
N/A

Apparatus and method for reducing peak to average power ratio in a signal  
Patent #
US 10,305,718 B2
Filed 04/28/2016

Current Assignee
N/A

Method and apparatus for PAPR reduction of an OFDM signal  
Patent #
US 20050270968A1
Filed 06/02/2004

Current Assignee
N/A

Method and Apparatus for Generating and Receiving Ofdm Symbol  
Patent #
US 20090003478A1
Filed 01/12/2007

Current Assignee
N/A

Antijamming wireless multimedia broadcasting signal transmission method  
Patent #
CN 101,778,078 A
Filed 03/03/2010

Current Assignee

Multimedia mobile broadcast signal framing modulation method  
Patent #
CN 102,281,241 A
Filed 08/22/2011

Current Assignee

Synchronous processing method based on CMMB signals  
Patent #
CN 102,882,670 A
Filed 09/13/2012

Current Assignee

Method for reducing peaktomean ratio in OFDM (Orthogonal Frequency Division Multiplexing)  
Patent #
CN 103,326,985 A
Filed 07/15/2013

Current Assignee

6 Claims

1. a multimedia mobile broadcast signal framing modulation method, is characterized in that it comprises the following steps:

1) Multimedia Mobile broadcast signal transmission machine is deleted the input data bit of oneself the serially concatenated multi code Rate of Chinese character of flowing through the modulation of remaining convolutional encoding, code element and code element and is rotated in and on frequency domain, forms FFT coded data block, the length of FFT coded data block is K, and the numerical value of K is got even number;
Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping;
Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree;2) Multimedia Mobile broadcast signal transmission machine adopts IFFT that FFT coded data block is transformed to time domain discrete coded data sample value piece D _{total}=[d _{0}, d _{1}..., d _{k2}, d _{k1}];
3) Multimedia Mobile broadcast signal transmission machine is by time domain discrete coded data sample value piece demultiplexing and according to the sequencing odd even of each the time domain discrete coded data sample value successively separated strange subblock D of time domain discrete coded data sample value that generates _{very}=[d _{0}, d _{2}..., d _{k4}, d _{k2}] and the even subblock D of time domain discrete coded data sample value _{even}=[d _{1}, d _{3}..., d _{k3}, d _{k1}];
4) Multimedia Mobile broadcast signal transmission machine passes through peaktoaverage power ratio adjustment unit to the strange subblock D of time domain discrete coded data sample value _{very}, the even subblock D of time domain discrete coded data sample value _{even}carry out signal power adjustment and corresponding signal and process also synthetic new time domain discrete coded data sample value piece D again _{new}, new time domain discrete coded data sample value piece D _{new}adopt following generate pattern to obtain, generate pattern 1 is D _{new}=[D _{very}, D _{even}], generate pattern 2 is , generate pattern 3 is , generate pattern 4 is , generate pattern 5 is , generate pattern 6 is , generate pattern 7 is D _{new}=[D ^{*}_{very}, D _{even}], generate pattern 8 is generate pattern 9 is , generate pattern 10 is , generate pattern 11 is , generate pattern 12 is , generate pattern 13 is D _{new}=[D _{very}, D ^{*}_{even}], generate pattern 14 is , generate pattern 15 is , generate pattern 16 is , generate pattern 17 is , generate pattern 18 is , compare 18 kinds of time domain discrete coded data sample value piece D that generate pattern is synthetic _{new}, choose wherein there is minimum peaktoaverage power ratio peaktoaverage power ratio time domain discrete coded data sample value piece falls , and peaktoaverage power ratio time domain discrete coded data sample value piece will fall the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D ^{*}_{very}expression is to the strange subblock D of time domain discrete coded data sample value _{very}each time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value subblock that obtains;
D ^{*}_{even}expression is to the even subblock D of time domain discrete coded data sample value _{even}each time domain discrete coded data sample value carry out conjugate operation processing and the time domain discrete coded data sample value subblock that obtains;
5) Multimedia Mobile broadcast signal transmission machine Insert service index series after training sequence forms time domain embedding training sequence discrete sample block in time domain, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing Multimedia Mobile broadcast signal transmission machine;
Time domain embeds the length and the length numerically equal of falling peaktoaverage power ratio time domain discrete coded data sample value piece of training sequence discrete sample block;6) Multimedia Mobile broadcast signal transmission machine will fall peaktoaverage power ratio time domain discrete coded data sample value piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall peaktoaverage power ratio time domain discrete coded data sample value piece, as frame; 7) Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall peaktoaverage power ratio time domain discrete coded data sample value piece be frame using Cyclic Prefix as protection interval, and to form signal frame, the length of Cyclic Prefix is C; 8) Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame; 9) Multimedia Mobile broadcast signal transmission machine by baseband signal upconversion to carrier wave.


2. by the multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that:
 described training sequence is comprised of the first training sequence and the second training sequence;
The first training sequence alternately inserts the new sequence of generation by each symbol of permanent envelope zero autocorrelation CAZAC sequence B and pseudorandom PN sequence A and Cyclic Prefix that length is G forms;
The second training sequence is by permanent envelope zero autocorrelation CAZAC sequenceB ^{*}with pseudorandom PN sequence A ^{*}each symbol alternately insert the Cyclic Prefix that the new sequence that produces and length thereof are G and form;
B ^{*}expression is carried out conjugate operation processing, A to each symbol of B ^{*}expression is carried out conjugate operation processing to each symbol of A, and B has identical symbol lengths L with A.
 described training sequence is comprised of the first training sequence and the second training sequence;

3. by the multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that:
 described C gets 1/16 of K;
Described serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding and is formed more than being deleted by random interleaving serially concatenated by two convolutional encodings, and the encoding rate that serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,4/9,3/8,7/16 and 5/9.
 described C gets 1/16 of K;

4. by the multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that:
 described operational indicator sequence has pseudorandom characteristics, by one group of Phase shift m sequence, realized.

5. by the multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that:
 described FFT coded data block is comprised of subcarrier, the frequency interval of subcarrier is got a kind of in 2KHz, 4KHz, 1KHz.

6. by the multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that:
 described G gets 1/8 of L.
Specification(s)