Differential coder and decoder for pragmatic approach trellis-co

Details Differential coder and decoder for pragmatic approach trellis-co Differential coder and decoder for pragmatic approach trellis-co

1995-11-09

1998-05-26

Vo, Don N.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375280, 375283, 375308, 375331, 375332, 375341, 371 43, H04L 512, H04L 2302

Patent

active

057578567

ABSTRACT:
The invention relates to an 8-PSK differential coder for trellis-coded modulation and to a corresponding pragmatic decoder, enabling 90.degree., 180.degree., and 270.degree. phase ambiguities to be lifted. The invention applies in particular to transmitting images at high rate by radio link.

REFERENCES:
patent: 5233630 (1993-08-01), Wolf
patent: 5428631 (1995-06-01), Zehavi
patent: 5457705 (1995-10-01), Todoroki
Pietrobon et al, "Trellis-coded multidimensional phase modulation", IEEE Transactions on information Theory, vol. 36, No. 1, Jan. 1990, New York, US, pp. 63-89.
Zhu and Clark, "Rotationally invariant coded PSK signals", IEE Proceedings, F. Communications, Radar & Signal Processing, vol. 134, No. 1 Feb. 1989, Stevenage GB, pp. 43-52.
Henkel, "Phase-invariant coded phase shift keying using Reed-Muller codes", Archiv fur Elektronik und Ubertragunstechnik, vol. 46, Vo. 3, May 1992, Stuttgart de, pp. 125-130.

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