1990-06-04
1994-03-15
Baker, Stephen M.
Excavating
H03M 1312
Patent
active
052951421
ABSTRACT:
A Viterbi decoder for decoding a convolution coded reception signal. The Viterbi decoding uses an algorithm for efficiently executing the maximum likelihood decoding using a convolution code by selecting a path locating at the minimum distance from a reception series between two paths which are joined. Since it is necessary to store a state metric of each state, after the state metric of the surviving path was calculated by ACS calculation, it is considered to normalize metrics. However, this results in a large circuit scale and a low processing speed. Therefore, in this invention, a maximum likelihood value of a present state metric is detected from a maximum likelihood branch metric pair before the ACS calculation and the preceding maximum likelihood state metric pair and metrics are normalized by using the maximum likelihood value.
REFERENCES:
patent: 4802174 (1989-01-01), Hiraiwa et al.
patent: 4905317 (1990-02-01), Suzuki et al.
Clark, G., et al., Error-Correction Coding for Digital Communications, Plenum Press, New York, 1981, pp. 253-265.
Electronics and Communications in Japan 71 (Oct. 1988) No. 10 "Performance of a Viterbi Decoder Using Simplified Digital Metric Calculations," M. Miyake, T. Fujino and K. Fujiwara, pp. 114-123.
IEEE/IEICE Global Telecommunications Conference, 1987, Conference Record vol. 3 of 3, Nov. 15-18, 1987, Tokyo, Japan--Art. "Compression of Path Metrics in Viterbi Decoders," M. Miyake, T. Fujino and K. Fujiwara, pp. 43.2.1-43.2.5.
Baker Stephen M.
Sony Corporation
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