Differentially convolutional channel coding with expanded set of

Details Differentially convolutional channel coding with expanded set of Differentially convolutional channel coding with expanded set of

1983-04-18

1984-11-13

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 43, 375 39, H04L 512, H04L 110

Patent

active

044830122

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 introducing additional redundant signalling alphabets and differentially coding incoming data in a state-dependent sequential manner, enlarged minimum Euclidean distance between possible sequences of signaling alphabets is achieved while phase ambiguity of the expanded set of signalling alphabets is removed. This results in a reduced error probability when maximum likelihood decoding is applied in the receiver.

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patent: 4114710 (1978-09-01), Katoh et al.
patent: 4208739 (1980-06-01), Lu et al.
patent: 4346472 (1982-08-01), Ohkashi et al.
"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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