Method of processing signals in a viterbi decoder according to d

Details Method of processing signals in a viterbi decoder according to d Method of processing signals in a viterbi decoder according to d

1996-12-04

1999-02-09

Le, Amanda

Pulse or digital communications

Equalizers

Automatic

375262, 375341, 375350, 364724012, 36472419, 3647242, 371 437, 371 438, H04L 2722

Patent

active

058704337

ABSTRACT:
A method of digital telecommunication via an electrical cable is provided, whereby the symbols of a data stream to be transmitted are supplied as a transmission signal to a transmission path, after undergoing a digital-to-analog conversion. The transmission signal is received and sampled at the end of the transmission path on a receiving side. To further process the received signal on the receiving side, a Viterbi decoder operating on the basis of a trellis diagram is used. The Viterbi decoder uses a number of feedback filters to determine branch or path metrics in the trellis diagram, where this number is a function of the number of states in the trellis diagram. To determine the branch metrics in the trellis diagram, separate first feedback filters (8) are only used up to a specifiable number of symbol intervals in the trellis diagram, or up to a specifiable length of feedback filters for all states in the trellis diagram. A common feedback filter (9) is used for the other symbol intervals in the trellis diagram, to which the symbols of the path with the smallest path metrics at the end of the first feedback filter (8) in the trellis diagram are supplied.

REFERENCES:
patent: 5644603 (1997-07-01), Ushirokawa
patent: 5673288 (1997-09-01), Okanoue
"Error-Correction Coding for Digital Communications" George C. Clark, Jr. and J. Bibb Cain Applications of Communications Theory, pp. 252-267.
"Maximum-Likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference", G.D. Forney, Jr., IEEE Transactions on Information Theory, vol. IT-18, No. 3, May 1972, pp. 363 to 378.
"The Viterbi Algorithm", G.D. Forney, Jr., Proceedings of the IEEE, vol. 61, Mar. 1973, pp. 268 to 277.
Delayed Decision-Feedback Sequence Estimation, A. Duel-Hallen, et al., IEEE Transactions on Communications, vol. 37, No. 5, May 1989, pp. 428 to 436.

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