Sequential decoder

Details Sequential decoder Sequential decoder

1989-08-25

1991-05-07

Atkinson, Charles E.

Excavating

G06F 1110

Patent

active

050142755

ABSTRACT:
A sequential decoder for decoding a systematic and convolutional code signal having a code rate greater than 1/2 and carrying out error correction coding of the code signal. A local most likely path in a plurality of possible paths for a newly received information bit is determined by calculating a branch metric indicating likelihood of each of the plurality of possible paths in accordance with a predetermined algorithm. The path decision is carried out by a construction including a two-path comparing path decision circuit which receives a pair of bits comprised of an information bit and a parity bit at one time and determining a local most likely path between two possible paths for the information bit. A four-path comparing path decision circuit receives a pair of information bits at one time and determines a local most likely path among four possible paths for the pair of information bits. A parity bit timing detecting circuit detects a timing of an input of the above pair of bits comprised of an information bit and a parity bit. A selecting circuit selects an output of the above two-path comparing path decision circuit at the input timing of the above pair of bits comprised of an information bit and a parity bit, and selects an output of the above four-path comparing path decision circuit at the timing of the input of the above pair of information bits.

REFERENCES:
patent: 4630032 (1986-12-01), Gordon et al.
patent: 4710746 (1987-12-01), Shimoda et al.
patent: 4730322 (1988-03-01), Pollara-Bozzola

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