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Communication system |
| RE40936 |
Communication system
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| Patent Drawings: | |
| Inventor: |
Oshima |
| Date Issued: |
October 13, 2009 |
| Application: |
10/780,550 |
| Filed: |
February 18, 2004 |
| Inventors: |
Oshima; Mitsuaki (Kyoto, JP)
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| Assignee: |
Panasonic Corporation (Osaka, JP) |
| Primary Examiner: |
Chevalier; Robert |
| Assistant Examiner: |
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| Attorney Or Agent: |
Wenderoth, Lind & Ponack, L.L.P. |
| U.S. Class: |
386/46; 348/723; 348/E5.003; 348/E5.108; 375/E7.001; 375/E7.002; 375/E7.011; 375/E7.04; 375/E7.089; 375/E7.091 |
| Field Of Search: |
386/86; 386/1; 348/1; 348/24; 348/729; 348/608; 348/636; 348/723; 348/725; 348/737 |
| International Class: |
H04N 7/00; H04N 5/38 |
| U.S Patent Documents: |
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| Foreign Patent Documents: |
2095435; 1499725; 2627574; 1569334; 0031193; 0122805; 0282298; 0311188; 0329158; 0365431; 0392538; 0448492; 0485105; 0485108; 0485108; 0490552; 0506400; 0525641; 0531046; 0540231; 0540231; 1528854; 1529838; 2 187 611; 53-137657; 57-39629; 58-107740; 58-161427; 58-161547; 60-24753; 61-70861; 62-133842; 53-108215; 62-502932; 63-28145; 63-180222; 63-180280; 63-253738; 64-5135; 64-68144; 64-74836; 2-94814; 2-141049; 2-154583; 2-166979; 2-195732; 2-218279; 2-260726; 2-278940; 3-13145; 3-48587; 3-69295; 04-196822; 4-322592; 5-75568; 5-167633; 5-218978; 5-327807; 7-79415; 7-99522; 7-264148; 7-322219; 2004-159207; 52118; 85/04541; 86-07223; 89/08366; 91/20137; 92/14343; 92/22162 |
| Other References: |
Masafumi Saito et al., "Bit Error Rate Characteristics of OFDM in Multipath Enviroment", 1991. cited by other.
Ryutaro Ohmoto et al., ".pi./4-shift QPSK Subcarrier Transmission", 1991. cited by other.
J. A. C. Bingham, "Multicarrier Modulation for Data Transmission: An Idea Whose Time Has Come", IEEE Communications Magazine, vol. 28, May 1990, pp. 5-8 and 11-14. cited by other.
B. Hirosaki, "An Orthogonally Multiplexed QAM System Using the Discrete Fourier Transform", IEEE Transactions on Communications, vol. Com-29, No. 7, Jul. 1981, pp. 982-989. cited by other.
L. J. Cimini, Jr., "Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing", IEEE Transactions on Communications, vol. Com-33, No. 7, Jul. 1985, pp. 665-675 and Annex. cited by other.
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Shinji Matsumoto et al., "200 Mb/s 16 QAM Digital Radio-Relay System Operating in 4 and 5 GHz Bands", Japan Telecommunications Review, Jan. 1982, vol. 24, No. 1, pp. 65-73. cited by other.
M. Pecot et al., "Compatible Coding of Television Images, Part 2. Compatible System", Signal Processing Image Communication, Oct. 2, 1990, No. 3, pp. 259-268. cited by other.
Mitsuaki Oshima, "Constellation-Code Division Multiplex for Digital HDTV", IEEE, 1992, pp. 1086-1092. cited by other.
Tricia Hill et al., "A Performance Study of NLA 64-State QAM", IEEE Transactions on Communications, vol. COM-31, Jun. 1983, No. 6, pp. 821-826. cited by other.
Hideki Ishio et al., "A Proposal of a Carrier Digital Transmission System Using Multi-Level APSK", pp. 1-20. cited by other.
Shanmugam, "Digital and Analog Communication Systems" 1979, p. 272. cited by other.
Khaled Fazel et al., Combined multilevel coding and multiresolution modulation, Feb. 8, 1993, pp. 1081-1085. cited by other.
P. Hoeher et al., Performance of an RCPC-Coded OFDM-based Digital Audio Broadcasting (DAB) System, IEEE Global Telecommunications Conference "Globecom '91", Dec. 2-5, 1991, vol. 1 of 3, pp. 2.1.1-2.1.7. cited by other.
K. M. Uz et al., Combined multiresolution source coding and modulation for digital broadcast of HDTV , 1992, pp. 283-392. cited by other.
K. M. Uz et al., Multiresolution Source and Channel Coding for Digital Broadcast of HDTV, 1992, pp. 61-69. cited by other.
Nambi Seshadri et al., Multi-Level Block Coded Modulations with Unequal Error Protection for the Rayleigh Fading Channel, vol. 4, No. 3, May-Jun. 1993, pp. 325-334. cited by other.
William F. Schreiber, Spread-Spectrum Television Broadcasting, SMPTE Journal, Aug. 1992, pp. 538-549. cited by other.
Martin Vetterli et al., Multiresolution Coding Techniques for Digital Television: A Review, Multidimensional Systems and Signal Processing, vol. 3, May 1992, pp. 161-187. cited by other.
Ezio Biglieri et al., Introduction to Trellis-Coded Modulation with Applications, Apr. 6, 1992, pp. 173-207. cited by other.
English Language Abstract of European Patent No. 93 30 7575. cited by other.
Kazuhiko Nitadori, Synthesis of Multichannel Orthogonal VSB Signals by Quadrature Method, 1976 International Conference on Communications, Jun. 14-16, 1976, vol. 1, pp. 3-25-3-29. cited by other.
Thomas M. Cover, Broadcast Channels, IEEE Transactions on Information Theory, Jan. 1972, pp. 2-14. cited by other.
"Optimum Weighted PCM for Speech Signals", Sundberg, IEEE Transactions on Communications, vol. COM-26, No. 6, Jun. 1978, pp. 872-881. cited by other.
Shigeki Moriyama et al., "Delay Propagation Characteristics at VHF and UHF bands in Urban Area", 1991 Spring National Convention Record, The Institute of Electronics, Information and Communication Engineers, Part 2, p. 406, Mar. 15, 1991. cited byother.
Yasuhiro Ito et al., "Adaptive Weighted Code Division Multiplexing (AW-CDM) Transmission System for Terrestrial Digital Television Broadcasting", ITE Technical Report vol. 17, No. 13, pp. 27-32, Feb. 25, 1993. cited by other.
4th International Workshop on HDTV, Sep. 1991, Torino, IT, Elsevier 1992; pp. 61-69, Uz et al: "Multiresolution Source and Channel Coding for Digital Broadcast of HDTV". cited by examiner.
SMPTE Journal, vol. 101, No. 8, Aug. 1992, Scarsdale, NY US; pp. 538-549, Schreiber "Spread-Spectrum Television Broadcasting". cited by examiner.
Signal Processing: Image Communication, vol. 4, Aug. 1992, Amsterdam, NL; pp. 283-292, Uz et al: "Combined Multiresolution Source Coding and Modulation for Digital Broadcast of HDTV". cited by examiner.
Biglieri et al, "Introduction to Trellis-Coded Modulation with Applications", 1991, MacMillan, New York, US. cited by examiner.
IEEE International Conference on Communications, 23-26 May 1993, Geneva, CH; New York, US, 1993; pp. 1081-1085, Frazel & Ruf: "Combined Multilevel Coding and Multiresolution Modulation". cited by examiner.
European Transactions on Telecommunications and Related Technologies, vol. 4, No. 3, May 1993, Italy; pp. 325-334, Seshadei & Sunberg, "Multi-level Block Coded Modulations with Unequal Error Protection for the Rayleigh Fading Channel". cited byexaminer.
Multidimensional Systems and Signal Processing, vol. 3, No. 2-3, May 1992, NL, pp. 161-187, Vetterli et and Uz: "Multiresolution Coding Techniques for Digital Television: A Review". cited by examiner.
IEEE: Tranactions on Information Theory, vol. 18, No. 1, Jan. 1972, New York, US; pp. 2-4, Cover: "Broadcast Channels". cited by examiner.
IEEE globial Telecommunications Conference 1991, 2-5 Dec. 1991, Phoenix, US; IEEE New York, US, 1991; pp. 40-46, Hoecher et al.: "Performance of an RCPC-Coded OFDM-Based Digital Audio Broadcasting (DAB) System". cited by examiner. |
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| Abstract: |
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into, low and high, frequency band components which are designated as a first and a second data streams respectively. Upon receiving the TV signal, a receiver can reproduce only the low frequency band component or both the low and high frequency band components, depending on its capability. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier. |
| Claim: |
What is claimed is:
.[.1. A digital TV receiver comprising: a receiving section for receiving a PSK (Phase Shift Key) modulation signal comprising a plurality of signal points disposed onspecific phases of a given constellation in a signal space diagram; a demodulator for demodulating the received signal from said receiving action into a digital signal; an error correcting section for error correcting a demodulation signal from saiddemodulator; and an image expander for expanding an error-corrected signal from said error correcting section to a video signal, thereby outputting a video signal, wherein said demodulator demodulates the received signal as first and second PSK signals,said first PSK signal representing a first data stream to be reproduced, said first PSK signal comprising n-value signal points, said second PSK signal representing both said first data stream and a second data stream to be reproduced, said second PSKsignal comprising m-value signal points, where m is an integer larger than n, wherein the m-value signal points of said second PSK signal are divisible into n groups of signal points which are distinguishable from one another in the signal space, andsaid demodulator distinguishes said n groups of signal points from one another as the n-value signal points of said first PSK signal by demodulating the received signal as said first PSK signal, and wherein high priority information is demodulated atleast in said first data stream..].
.[.2. The digital TV receiver in accordance with claim 1, wherein said demodulator demodulates information relating to a low-resolution component of the video signal from said first data stream and demodulates information relating to ahigh-resolution component of the video signal from said second data stream..].
.[.3. The digital TV receiver in accordance with claim 1, comprising means for stopping output of said second data stream when an error rate of the received signal is high..].
.[.4. The digital TV receiver in accordance with claim 1, wherein said demodulator comprises first means for demodulating the received signal as a QPSK signal to reproduce the first data stream and second means for demodulating the receivedsignal as a 8PSK signal to reproduce both of the first data stream and the second data stream..].
.[.5. A digital TV receiver comprising: a receiving section for receiving a PSK (Phase Shift Key) modulation signal comprising m-value signal points disposed on specific phases of a given constellation in a signal space diagram and representinga first data stream and a second data stream to be reproduced; a demodulator for demodulating said PSK modulation signal from said receiving section into a digital signal; an error correcting section for error correcting a demodulation signal from saiddemodulator; and an image expander for expanding an error-corrected signal from said error correcting section to a video signal, wherein said demodulator includes means for demodulating said PSK signal comprising m-value signal points as another PSKsignal, said another PSK signal comprising n-value signal points and representing only said first data stream, wherein n is an integer smaller than m, and wherein high priority information is demodulated at least in said first data stream..].
.Iadd.6. A signal transmission and receiving apparatus for transmitting and receiving a VSB modulated signal having information of a first data stream and a second data stream, the apparatus comprising a transmission apparatus and a receivingapparatus, said transmission apparatus comprising: an interleaver operable to interleave the second data stream to produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level VSBmodulated signal and modulate the interleaved data stream to an n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includes information representing the value of n; and a transmitter operable to transmit them-level VSB modulated signal and the n-level VSB modulated signal; said receiving apparatus comprising: a demodulator operable to demodulate the m-level VSB modulated signal to the first data stream and demodulate the n-level VSB modulated signal to ademodulated data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and a de-interleaver operable to de-interleave the demodulated data stream to the second data stream. .Iaddend.
.Iadd.7. A signal transmission apparatus for transmitting a VSB modulated signal having information of a first data stream and a second data stream, the apparatus comprising: an interleaver operable to interleave the second data stream toproduce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level VSB modulated signal and modulate the interleaved data stream to an n-level VSB modulated signal, n being an integerlarger than m, wherein the first data stream including information representing the value of n; and a transmitter operable to transmit the m-level VSB modulated signal and the n-level VSB modulated signal. .Iaddend.
.Iadd.8. A signal receiving apparatus comprising: a receiver operable to receive a transmitted VSB modulated signal, wherein said transmitted VSB modulated signal includes an m-level VSB modulated signal and an n-level VSB modulated signal, nbeing an integer larger than m; a demodulator operable to demodulate the m-level VSB modulated signal to a first data stream, which is a non-interleaved data stream including information representing the value of n, and demodulate the n-level VSBmodulated signal to a demodulated data stream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and a de-interleaver operable to de-interleave thedemodulated data stream to a second data stream. .Iaddend.
.Iadd.9. A signal transmission and receiving method for transmitting and receiving a VSB modulated signal having information of a first data stream and a second data stream, the method comprising a transmission method and a receiving method,said transmission method comprising: interleaving the second data stream to produce an interleaved data stream; modulating the first data stream, without being interleaved, to an m-level VSB modulated signal and modulating the interleaved data stream toan n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includes information representing the value of n; and transmitting the m-level VSB modulated signal and the n-level VSB modulated signal; said receivingmethod comprising: demodulating the m-level VSB modulated signal to the first data stream and demodulating the n-level VSB modulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced according to the informationrepresenting the value of n; and de-interleaving the demodulated data stream to the second data stream. .Iaddend.
.Iadd.10. A signal transmission method for transmitting a VSB modulated signal having information of a first data stream and a second data stream, the method comprising: interleaving the second data stream to produce an interleaved data stream; modulating the first data stream, without being interleaved, to an m-level VSB modulated signal and modulating the interleaved data stream to an n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includesinformation representing the value of n; and transmitting the m-level VSB modulated signal and the n-level VSB modulated signal. .Iaddend.
.Iadd.11. A signal receiving method comprising: receiving a transmitted VSB modulated signal, wherein said transmitted VSB modulated signal includes an m-level VSB modulated signal and an n-level VSB modulated signal, n being an integer largerthan m; demodulating the m-level VSB modulated signal to a first data stream, which is a non-interleaved data stream including information representing the value of n, and demodulating the n-level VSB modulated signal to a demodulated data stream, whichis an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and de-interleaving the demodulated data stream to a second data stream. .Iaddend.
.Iadd.12. A signal transmission and receiving apparatus for transmitting and receiving a VSB modulated signal having information of a first data stream and a second data stream, the apparatus comprising a transmission apparatus and a receivingapparatus, said transmission apparatus comprising: an interleaver operable to interleave the second data stream to produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level VSBmodulated signal and modulate the interleaved data stream to an n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includes information representing a modulation scheme; and a transmitter operable to transmitthe m-level VSB modulated signal and the n-level VSB modulated signal; said receiving apparatus comprising: a demodulator operable to demodulate the m-level VSB modulated signal to the first data stream and demodulate the n-level VSB modulated signal toa demodulated data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and a de-interleaver operable to de-interleave the demodulated data stream to the second data stream. .Iaddend.
.Iadd.13. A signal transmission apparatus for transmitting a VSB modulated signal having information of a first data stream and a second data stream, the apparatus comprising: an interleaver operable to interleave the second data stream toproduce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level VSB modulated signal and modulate the interleaved data stream to an n-level VSB modulated signal, n being an integerlarger than m, wherein the first data stream includes information representing a modulation scheme; and a transmitter operable to transmit the m-level VSB modulated signal and the n-level VSB modulated signal. .Iaddend.
.Iadd.14. A signal receiving apparatus comprising: a receiver operable to receive a transmitted VSB modulated signal, wherein said transmitted VSB modulated signal includes an m-level VSB modulated signal and an n-level VSB modulated signal, nbeing an integer larger than m; a demodulator operable to demodulate the m-level VSB modulated signal to a first data stream, which is a non-interleaved data stream including information representing a modulation scheme, and demodulate the n-level VSBmodulated signal to a demodulated data stream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and a de-interleaver operable to de-interleave thedemodulated data stream to a second data stream. .Iaddend.
.Iadd.15. A signal transmission and receiving method for transmitting and receiving a VSB modulated signal having information of a first data stream and a second data stream, the method comprising a transmission method and a receiving method,said transmission method comprising: interleaving the second data stream to produce an interleaved data stream, modulating the first data stream, without being interleaved, to an m-level VSB modulated signal and modulating the interleaved data stream toan n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includes information representing a modulation scheme; and transmitting the m-level VSB modulated signal and the n-level VSB modulated signal; saidreceiving method comprising: demodulating the m-level VSB modulated signal to the first data stream and demodulating the n-level VSB modulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced according to theinformation representing the modulation scheme; and de-interleaving the demodulated data stream to the second data stream. .Iaddend.
.Iadd.16. A signal transmission method for transmitting a VSB modulated signal having information of a first data stream and a second data stream, the method comprising: interleaving the second data stream to produce an interleaved data stream; modulating the first data stream, without being interleaved, to an m-level VSB modulated signal and modulating the interleaved data stream to an n-level VSB modulated signal, n being an integer larger than m, wherein the first data stream includesinformation representing a modulation scheme; and transmitting the m-level VSB modulated signal and the n-level VSB modulated signal. .Iaddend.
.Iadd.17. A signal receiving method comprising: receiving a transmitted VSB modulated signal, wherein said transmitted VSB modulated signal includes an m-level VSB modulated signal and an n-level VSB modulated signal, n being an integer largerthan m; demodulating the m-level VSB modulated signal to a first data stream, which is a non-interleaved data stream including information representing a modulation scheme, and demodulating the n-level VSB modulated signal to a demodulated data stream,which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and de-interleaving the demodulated data stream to a second data stream. .Iaddend.
.Iadd.18. A signal transmission and receiving apparatus for transmitting and receiving a QAM or PSK modulated signal having information of a first data stream and a second data stream, the apparatus comprising a transmission apparatus and areceiving apparatus, said transmission apparatus comprising: an interleaver operable to interleave the second data stream to produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to anm-level QAM or PSK modulated signal and modulate the interleaved data stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes information representing the value of n; and a transmitter operable to transmit the m-levelQAM or PSK modulated signal and the n-level QAM or PSK modulated signal; said receiving apparatus comprising: a demodulator operable to demodulate the m-level QAM or PSK modulated signal to the first data stream and demodulate the n-level QAM or PSKmodulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and a de-interleaver operable to de-interleave the demodulated data stream to the second datastream. .Iaddend.
.Iadd.19. A signal transmission apparatus for transmitting a QAM or PSK modulated signal having information of a first data stream and a second data stream, the apparatus comprising: an interleaver operable to interleave the second data streamto produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulate the interleaved data stream to an n-level QAM or PSK modulated signal,wherein the first data stream includes information representing the value of n; and a transmitter operable to transmit the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal. .Iaddend.
.Iadd.20. A signal receiving apparatus comprising: a receiver operable to receive a transmitted QAM or PSK modulated signal, wherein said transmitted QAM or PSK modulated signal includes an m-level QAM or PSK modulated signal and an n-level QAMor PSK modulated signal; a demodulator operable to demodulate the m-level QAM or PSK modulated signal to a first data stream, where is a non-interleaved data stream including information representing the value of n, and demodulate the n-level QAM or PSKmodulated signal to a demodulated data stream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and a de-interleaver operable to de-interleave thedemodulated data stream to a second data stream. .Iaddend.
.Iadd.21. A signal transmission and receiving method for transmitting and receiving a QAM or PSK modulated signal having information of a first data stream and a second data stream, the method comprising a transmission method and a receivingmethod, said transmission method comprising: interleaving the second data stream to produce an interleaved data stream; modulating the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulating the interleaveddata stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes information representing the value of n; and transmitting the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal; said receivingmethod comprising: demodulating the m-level QAM or PSK modulated signal to the first data stream and demodulating the n-level QAM or PSK modulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced according to theinformation representing the value of n; and de-interleaving the demodulated data stream to the second data stream. .Iaddend.
.Iadd.22. A signal transmission method for transmitting a QAM or PSK modulated signal having information of a first data stream and a second data stream, the method comprising: interleaving the second data stream to produce an interleaved datastream; modulating the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulating the interleaved data stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes informationrepresenting the value of n; and transmitting the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal. .Iaddend.
.Iadd.23. A signal receiving method comprising: receiving a transmitted QAM or PSK modulated signal, wherein said transmitted QAM or PSK modulated signal includes an m-level QAM or PSK modulated signal and an n-level QAM or PSK modulatedsignal; demodulating the m-level QAM or PSK modulated signal to a first data stream, which is a non-interleaved data stream including information representing the value of n, and demodulating the n-level QAM or PSK modulated signal to a demodulated datastream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the value of n; and de-interleaving the demodulated data stream to a second data stream. .Iaddend.
.Iadd.24. A signal transmission and receiving apparatus for transmitting and receiving a QAM or PSK modulated signal having information of a first data stream and a second data stream, the apparatus comprising a transmission apparatus and areceiving apparatus, said transmission apparatus comprising: an interleaver operable to interleave the second data stream to produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to anm-level QAM or PSK modulated signal and modulate the interleaved data stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes information representing a modulation scheme; and a transmitter operable to transmit them-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal; said receiving apparatus comprising: a demodulator operable to demodulate the m-level QAM or PSK modulated signal to the first data stream and demodulate the n-level QAM orPSK modulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and a de-interleaver operable to de-interleave the demodulated data stream to thesecond data stream. .Iaddend.
.Iadd.25. A signal transmission apparatus for transmitting a QAM or PSK modulated signal having information of a first data stream and a second data stream, the apparatus comprising: an interleaver operable to interleave the second data streamto produce an interleaved data stream; a modulator operable to modulate the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulate the interleaved data stream to an n-level QAM or PSK modulated signal,wherein the first data stream includes information representing a modulation scheme; and a transmitter operable to transmit the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal. .Iaddend.
.Iadd.26. A signal receiving apparatus comprising: a receiver operable to receive a transmitted QAM or PSK modulated signal, wherein said transmitted QAM or PSK modulated signal includes an m-level QAM or PSK modulated signal and an n-level QAMor PSK modulated signal; a demodulator operable to demodulate the m-level QAM or PSK modulated signal to a first data stream, which is a non-interleaved data stream including information representing a modulation scheme, and demodulate the n-level QAMor PSK modulated signal to a demodulated data stream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and a de-interleaver operable to de-interleavethe demodulated data stream to a second data stream. .Iaddend.
.Iadd.27. A signal transmission and receiving method for transmitting and receiving a QAM or PSK modulated signal having information of a first data stream and a second data stream, the method comprising a transmission method and a receivingmethod, said transmission method comprising: interleaving the second data stream to produce an interleaved data stream; modulating the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulating the interleaveddata stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes information representing a modulation scheme; and transmitting the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal; saidreceiving method comprising: demodulating the m-level QAM or PSK modulated signal to the first data stream and demodulating the n-level QAM or PSK modulated signal to a demodulated data stream, wherein the demodulated data stream is reproduced accordingto the information representing the modulation scheme; and de-interleaving the demodulated data stream to the second data stream. .Iaddend.
.Iadd.28. A signal transmission method for transmitting a QAM or PSK modulated signal having information of a first data stream and a second data stream, the method comprising: interleaving the second data stream to produce an interleaved datastream; modulating the first data stream, without being interleaved, to an m-level QAM or PSK modulated signal and modulating the interleaved data stream to an n-level QAM or PSK modulated signal, wherein the first data stream includes informationrepresenting a modulation scheme; and transmitting the m-level QAM or PSK modulated signal and the n-level QAM or PSK modulated signal. .Iaddend.
.Iadd.29. A signal receiving method comprising: receiving a transmitted QAM or PSK modulated signal, wherein said transmitted QAM or PSK modulated signal includes an m-level QAM or PSK modulated signal and an n-level QAM or PSK modulatedsignal; demodulating the m-level QAM or PSK modulated signal to a first data stream, which is a non-interleaved data stream including information representing a modulation scheme, and demodulating the n-level QAM or PSK modulated signal to a demodulateddata stream, which is an interleaved data stream, wherein the demodulated data stream is reproduced according to the information representing the modulation scheme; and de-interleaving the demodulated data stream to a second data stream. .Iaddend. |
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