Punctured convolutional encoder

Excavating

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H03M 1312

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active

055110827

ABSTRACT:
A method and apparatus are provided for convolutionally encoding digital data with a rate 4/5 convolutional code. A nonoptimal rate 1/2, sixteen-state convolutional code is punctured to rate 4/5 using a puncture map of ##EQU1## and octal generators 25, 37 wherein .nu.=4. An incoming data stream is processed using the rate 4/5 code. Punctured rate 3/4 and 6/7 codes are also provided.

REFERENCES:
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Patent Abstracts of Japan, Unexamined Applications, E Field, vol. 17, No. 599, Nov. 2, 1993, The Patent Office Japanese Government, p. 167 E 1455, JP-A-05 183 449.
Y. Yasuda, et al., "High-Rate Punctured Convolutional Codes for Soft Decision Viterbi Decoding," IEEE Transactions on Communications, vol. COM-32, No. 3, Mar., 1984, pp. 315-318.
J. Cain, et al., "Punctured Convolutional Codes of Rate (n-1)
and Simplified Maximum Likelihood Decoding," IEEE Transactions on Information Theory, vol. IT-25, No. 1, Jan., 1979, pp. 97-100.
K. J. Hole, "New Short Constraint Length Rate (N-1)/N Punctured Convolutional Codes for Soft-Decision Viterbi Decoding," IEEE Transactions on Information Theory, vol. 34, No. 5, Sep., 1988, pp. 1079-1081.

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