Multiplex communications – Generalized orthogonal or special mathematical techniques
Patent
1996-03-25
1998-06-23
Olms, Douglas W.
Multiplex communications
Generalized orthogonal or special mathematical techniques
370343, 370480, H04B 7204, H04J 1100
Patent
active
057712239
ABSTRACT:
A Fourier transform circuit in a receiver performs a Fourier transform on a orthogonal frequency division multiplexing signal received through a transmission channel for each symbol to sequentially reproduce a received reference vector sequence and a received vector sequence. An interleave circuit interleaves elements of the received reference vector sequence and the received vector sequence. A memory stores the received reference vector sequence. A vector modulation circuit modulates the received reference vector sequence by respective signal point vectors representing each signal point to generate a modulation vector sequence for each symbol. A metric generation circuit then obtains a difference between the received vector sequence and the modulation vector sequence to generate the difference as a branch metric sequence. A trellis decode circuit reproduces a data sequence on the basis of the branch metric sequence.
REFERENCES:
patent: 5274629 (1993-12-01), Helard et al.
patent: 5406551 (1995-04-01), Saito et al.
patent: 5450456 (1995-09-01), Mueller
patent: 5519692 (1996-05-01), Hershey
Paul H. Moose, "Differential Modulation and Demodulation of Multi-Frequency Digital Communication Signals," IEEE Military Communications Conference, pp. 12.4.1-12.4.5, 1990.
H. Rohling & V. Engels, "Differential Amplitude Phase Shift Keying (DASPK)--A New Modulation method for DTVB," Int'l Broadcasting Conv., IEE, pp. 102-108, Sep. 1995.
Leonard J. Cimini, Jr., "Analysis and Simulation of a Digital Mobile Channel Using Orthogonal Frequency Division Multiplexing," IEEE Trans. on Comm., vol. COM-33, No. 7, pp. 665-675, Jul. 1985.
"A Digital Modulation Method for Terrestrial Digital Broadcasting Systems Using a Trellis Coded OFDM under Multipath Conditions", Masafumi Saito and Shigeki Moriyama, NHK Science and Technical Research Laboratories, vol. 47, No. 10, pp. 1374-1382 (1993).
Harada Yasuo
Hayashino Hiroshi
Kimura Tomohiro
Uno Yasuhiro
Matsushita Electric - Industrial Co., Ltd.
Olms Douglas W.
Phillips Matthew C.
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