Differentially nonlinear convolutional channel coding with expan

Details Differentially nonlinear convolutional channel coding with expan Differentially nonlinear convolutional channel coding with expan

1983-08-05

1985-05-28

Safourek, Benedict V.

Pulse or digital communications

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Testing

371 43, 375 39, H04L 110, H04L 512

Patent

active

045204900

ABSTRACT:
A technique for converting a sequence of binary digits into a sequence of signalling alphabets of a modulated carrier signal for data transmission. By differentially encoding incoming data, non-linearly encoding the differentially encoded output in a state-dependent sequential manner and mapping the non-linearly encoded output into an expanded set of signalling alphabets having 90, 180 and 270 degree phase ambiguities, enlarged minimum Euclidean distance between possible sequences of signalling alphabets is achieved while the effect of the phase ambiguities of the expanded set of signalling alphabets can be removed in the receiver. This results in a reduced error probability when maximum likelihood decoding and differential decoding are applied in the receiver.

REFERENCES:
patent: 4077021 (1978-02-01), Csajka et al.
patent: 4084137 (1978-04-01), Welti
patent: 4358853 (1982-11-01), Qureshi
patent: 4483012 (1984-11-01), Wei
"The Viterbi Algorithm", Proc. of IEEE, vol. 61, No. 3, Mar. 1971, by G. D. Forney, pp. 268-278.
"Jointly Adaptive Equalization and Carrier Recovery in Two-Dimensional Digital Communication Systems", BSTJ, vol. 55, No. 3, Mar. 1976, by D. D. Falconer, pp. 317-334.
"Channel Coding with Multilevel/Phase Signals", IEEE Trans. on Information Theory, vol. IT-28, No. 1, Jan. 1982, by G. Ungerboeck, pp. 55-67.

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