H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/223, 354/67
H03M 13/39 (2006.01)
Patent
CA 1320582
SEQUENTIAL DECODER ABSTRACT OF THE DISCLOSURE 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, wherein a locally 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 for receiving a pair of bits comprised of an information bit and a parity bit at one time and determining a locally most likely path between two possible paths for the information bit; a four-path comparing path decision circuit for receiving a pair of information bits at one time and determining a locally most likely path among four possible paths for the pair of information bits; a parity bit timing detecting circuit for detecting a timing of an input of the above pair of bits comprised of an information bit and a parity bit; and a selecting circuit for selecting an output of the above two-path comparing path decision circuit at the timing of the input of the above pair of bits comprised of an information bit and a parity bit, and selecting an output of the above four-path comparing path decision circuit at the timing of the input of the above pair of information bits.
609175
Ageno Yuzo
Shimoda Kaneyasu
Fujitsu Limited
Mcfadden Fincham
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