Data transmission apparatus and method, and data reconstitution apparatus and method

• US 8,565,336 B2
• Filed: 01/23/2012
• Issued: 10/22/2013
• Est. Priority Date: 02/08/2011
• Status: Expired due to Fees

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Lim, Jong Soo
• Primary Examiner(s): Ahn, Sam K
• Assistant Examiner(s): Perez, James M
• Application Number:
  US13/356,226
• Publication Number:
  US 20120201331A1
• Time in Patent Office: 638 Days
• Field of Search: 375259-261, 375263-271, 375279-285, 375295-300, 375/302, 375/308, 375/316, 375/320, 375/322, 375324-333, 375/340, 375/342, 375346-351
• US Class Current: 375/284
• CPC Class Codes: H04L 27/183 Multiresolution systems
• CPC Class Codes: H04L 27/2634 Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
• CPC Class Codes: H04L 27/26524 Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation

Abstract

Disclosed are data transmission/reception apparatus and method that may be applied to a case where additional data is to be transmitted in a CE-OFDM modulation/demodulation scheme that satisfies an OFDM feature which is robust against multipath fading and simultaneously has a feature that amplitude is constant. Service channel information, modulation parameter information of a physical layer, and the like, may be transmitted by using an additionally secured information channel. If using this, a service search time may be saved, and power of a receiver may be reduced.

Claims

1. A data transmission apparatus for inserting additional data upon data modulation, the data transmission apparatus comprising:

a first data modulating unit comprising a first symbol mapping unit configured to symbol-map first input data, wherein the first data modulating unit is configured to generate first modulated data by digital-modulating the first input data in accordance with a multi-carrier modulation scheme;

a second symbol mapping unit configured to generate second mapping data by symbol-mapping second input data inserted after the input of the first input data;

a second data modulating unit configured to combine the first modulated data with the second mapping data and generate second modulated data by digital-modulating the combined data again in accordance with a predefined modulation scheme; and

a data transmitting unit configured to transmit the second modulated data to the exterior,

wherein, when the second data modulating unit combines the first modulated data with the second mapping data, the second data modulating unit inserts phase information of symbols related to the second mapping data to a DC component of a signal containing the first modulated data.

2. The data transmission apparatus of claim 1, wherein, when the second data modulating unit combines the first modulated data with the second mapping data, the second modulating unit uses any one of a first combination, which adds a phase value of the first modulated data and a phase value of the second mapping data, a second combination, which subtracts the phase value of the second mapping data from the phase value of the first modulated data, and a third combination, which subtracts the phase value of the first modulated data from the phase value of the second mapping data.

3. The data transmission apparatus of claim 1, wherein the second data modulating unit uses a modulation scheme different from the multi-carrier modulation scheme as the predefined modulation scheme.

4. The data transmission apparatus of claim 1, wherein the second symbol mapping unit performs the symbol mapping of the second input data by phase-modulating the second input data.

5. The data transmission apparatus of claim 1, wherein the data transmission apparatus is implemented with a Constant Envelope-Orthogonal Frequency Division Multiplexing (CE-OFDM) transmitter.

6. A data transmission method for inserting additional data upon data modulation, the data transmission method comprising:

a first data modulating step comprising a first symbol mapping step for symbol-mapping first input data, wherein the first data modulating step generates first modulated data by digital-modulating the first input data in accordance with a multi-carrier modulation scheme;

a second symbol mapping step for generating second mapping data by symbol-mapping second input data inserted after the input of the first input data

a second data modulating step for combining the first modulated data with the second mapping data and generating second modulated data by digital-modulating the combined data again in accordance with a predefined modulation scheme; and

a data transmitting step for transmitting the second modulated data to the exterior,

wherein, when the first modulated data is combined with the second mapping data in the second data modulating step, phase information of symbols related to the second mapping data is inserted into a DC component of a signal containing the first modulated data.

7. The data transmission method of claim 6, wherein, when the first modulated data is combined with the second mapping data, the second modulating step uses any one of a first combination, which adds a phase value of the first modulated data and a phase value of the second mapping data, a second combination, which subtracts the phase value of the second mapping data from the phase value of the first modulated data, and a third combination, which subtracts the phase value of the first modulated data from the phase value of the second mapping data.

8. A data reconstitution apparatus, comprising:

a demodulating unit configured to

extract second data from combined data in which first data was combined with the second data to form the second data and the first data from which the second data is extracted,

perform digital-demodulation on the extracted second data in accordance with a predefined first demodulation scheme, and

perform digital-demodulation on the first data from which the second data is extracted, in accordance with a predefined second demodulation scheme;

a second data reconstituting unit configured to reconstitute the second data by symbol-demapping the digital-demodulated second data; and

a first data reconstituting unit configured to reconstitute the first data by digital-demodulation of the digital-demodulated first data again in accordance with a multi-carrier demodulation scheme,

wherein the data demodulating unit performs the first demodulation scheme, based on phase information of symbols inserted into a DC component of a signal containing the combined data.

9. The data reconstitution apparatus of claim 8, wherein the data demodulating unit forms the digital-demodulated first data by subtracting a phase value of the second data from the first data from which the second data is extracted, or by adding the phase value of the second data and the first data from which the second data is extracted, when the digital demodulation is performed in accordance with the second demodulation scheme.

10. The data reconstitution apparatus of claim 8, wherein the data demodulating unit uses a demodulation scheme different from the multi-carrier demodulation scheme as the first demodulation scheme or the second demodulation scheme.

11. The data reconstitution apparatus of claim 8, wherein the data reconstitution apparatus is implemented with a Constant Envelope-Orthogonal Frequency Division Multiplexing (CE-OFDM) receiver.

12. The data reconstitution apparatus of claim 8, further comprising:

a data receiving unit configured to interwork with a data transmission apparatus combining the first data with the second data upon secondary data modulation, and receive the combined data from the data transmission apparatus.

13. The data reconstitution apparatus of claim 12, wherein the data transmission apparatus comprises:

a first data modulating unit comprising a first symbol mapping unit configured to symbol-mapping the first data, wherein the first data modulating unit is configured generate first modulated data by digital-modulating the first data in accordance with a multi-carrier modulation scheme;

a second symbol mapping unit configured to generate second mapping data by symbol-mapping the second data inserted after the input of the first data;

a second data modulating unit configured to combine the first modulated data with the second mapping data, and generate the combined data by digital-modulating the combined data again in accordance with a modulation scheme different from the multi-carrier modulation scheme; and

a data transmitting unit configured to transmit the combined data to the data reconstitution apparatus.

14. A data reconstitution method, comprising:

a data demodulating step for

extracting second data from combined data in which first data was combined with the second data to form the second data and the first data from which the second data is extracted,

digital-demodulating the extracted second data in accordance with a predefined first demodulation scheme, and

digital-demodulating the first data from which the second data is extracted, in accordance with a predefined second demodulation scheme;

a second data reconstituting step for reconstituting the second data by symbol-demapping the digital-demodulated second data; and

a first data reconstituting step for reconstituting the first data by digital-demodulating the digital-demodulated first data again in accordance with a multi-carrier demodulation scheme,

wherein the data demodulating step performs the first demodulation scheme, based on phase information of symbols inserted into a DC component of a signal containing the combined data.

15. The data reconstitution method of claim 14, wherein the data demodulating step forms the digital-demodulated first data by subtracting a phase value of the second data from the first data from which the second data is extracted, or by adding the phase value of the second data and the first data from which the second data is extracted, when the digital demodulation is performed in accordance with the second demodulation scheme.

16. The data reconstitution method of claim 14, wherein the data demodulating step uses a demodulation scheme different from the multi-carrier demodulation scheme as the first demodulation scheme or the second demodulation scheme.

17. The data reconstitution method of claim 14, further comprising:

a data receiving step for interworking with a data transmission apparatus combining the first data with the second data upon secondary data modulation, and receiving the combined data from the data transmission apparatus.