Differential encoding technique

Details Differential encoding technique Differential encoding technique

1983-04-18

1984-12-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 38, 375 39, H04L 2516

Patent

active

044894180

ABSTRACT:
A stream of data to be transmitted is arranged in n streams of 2-bit words. Successive pairs of bits in each of those streams are differentially encoded by generating for each different combination of their values a predetermined one of the differentially encoded bit pairs (i,q), (q,i), (i,q) and (q,i) associated with that combination, where (i,q) is the previously generated differentially encoded bit pair. Words each comprised of the first (second) bit of a respective bit pair in each of the resulting n differentially encoded streams are then provided as n-bit words in a first (second) input stream for a two-dimensional channel coder. In the receiver, the channel decoder provides first and second streams of n-bit words. The bits of the latter are then arranged such that each word in the first (second) stream of channel-decoded words becomes the first (second) bit of a differentially encoded bit pair in a respective one of n differentially encoded bit pair streams. The pairs of bits in each of the n differentially encoded streams are then differentially decoded to recover the original data.

REFERENCES:
patent: 4084137 (1978-04-01), Welti
patent: 4114710 (1979-09-01), Katoh et al.
patent: 4141034 (1979-02-01), Netravali et al.
"Channel Coding with Multilevel/Phase Signals," IEEE Trans. Information Theory, G. Ungerboeck, Jan. 1982, pp. 55-67.
"The Viterbi Algorithm," Proc. of IEEE, G. D. Forney, Jr., Mar. 1973, pp. 268-278.

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