Convolutional encoder

Details Convolutional encoder Convolutional encoder

1987-10-13

1989-02-28

Malzahn, David H.

Excavating

G06F 1110

Patent

active

048092770

ABSTRACT:
An encoding apparatus comprises a converter and a convolutional encoder. The converter translates a k-bit input to an m-bit output, where m is smaller than k, and the k-bit input belongs to one of 2.sup.m subsets of a set of 2.sup.k elements, the m-bit output representing the subset to which the k-bit inputs belong. Each of the subsets has 2.sup.k-m elements and the minimum Hamming distance between any of the 2.sup.k-m elements is equal to or greater than the Hamming distance to be achieved by the encoder. The convolutional encoder is responsive to the k-bit input and the m-bit output of the converter to generate an (n-k)-bit output, where n is greater than k.

REFERENCES:
patent: 4669084 (1987-05-01), Hartman et al.
patent: 4682343 (1987-07-01), Pfiffner
patent: 4700349 (1987-10-01), Gallager
patent: 4761784 (1988-08-01), Srinivasagopalan et al.
IEEE Transactions on Information Theory, vol. 23, No. 5, 1977, pp. 615-618, Hagenaver, "High Rate Convolutional Codes with Good Distance Profiles".
Sixth International Conference on Digital Satellite Communications, Session 12, pp. 24-31, "Development of Variable-Rate Viterbi Decoder and its Performance Characteristics", 1983.

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