Method and apparatus for encoding and decoding digital signals
US5870414A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1996 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | Sep 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/136
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of encoding a digital signal comprising a sequence of digital words, each comprising a first portion and a second portion, comprises the steps of successively encoding respective first portions using a trellis code to produce a corresponding sequence of trellis-encoded words, using each of the trellis-coded words to select one of a plurality of subcodes of a block code, and using the selected subcode to encode the corresponding second portion of the digital word corresponding sequentially to the trellis-coded word used to select the subcode, thereby providing a sequence of codewords corresponding to the sequence of digital words. After transmission and/or storage, a sequence of codeword vectors comprising the codewords and noise may be decoded by operating upon each of the sequence of codeword vectors using a decoder for each of the subcodes to produce, for each subcode, an estimated decoded second portion and a metric representing the likelihood that the estimated decoded second portion is correct, given that the assumed subcode is correct; using a trellis decoder, operating upon the sequence of likelihood metrics and the associated estimated second portions to provide a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.