Bidirectional trellis coding

Details Bidirectional trellis coding Bidirectional trellis coding

1995-05-30

1997-01-14

Canney, Vincent P.

Excavating

371 381, 371 44, G06F 1100

Patent

active

055947425

ABSTRACT:
A block code decoding method finds the highest path metric path in a forward direction of a trellis diagram from an initial state of the trellis diagram to a final state. Next, the highest path metric path is found in a backward direction from the final state back to the initial state. The metrics of these two highest path metric paths are compared and the path having the absolute highest metric, in either direction, is chosen as a most likely path through the trellis diagram.

REFERENCES:
The Viterbi Algorithm by G. David Forney, Jr., Proceedings of the IEEE, vol. 61, No. 3, Mar. 1973, pp. 268-277.
Trellis-Coded Modulation with Multidimensional Constellations by Lee-Fang Wei, IEEE Transactions on Information Theory, vol. It-33, No. 4, Jul. 1987, pp. 483-501.
"Digital Communications" Second Edition by John G. Proakis .COPYRGT.1989 by McGraw-Hill Book Co., pp. 377-428.
"Integrated Algebra & Trigonometry" by Robert C. Fisher & Allen D. Ziebur .COPYRGT.1958 by Prentice-Hall, Inc. pp. 37-41 & 366-371.
"Digital Communications", 2nd Edition, by John Proakis, McGraw Hill Book Co. .COPYRGT.1989 pp. 440-459.

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