Trellis-based decoder with state and path purging
US6788750B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2000 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Oct 1, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3416
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method for decoding a sequence of symbols encoded by an encoding system with a plurality of possible states and transmitted over a channel, wherein the encoding system output can be represented by a trellis diagram. The method includes receiving a signal corresponding to the sequence of symbols transmitted over the channel and responsive to the signal, finding respective old state metrics for one or more of the possible states of the encoding system that correspond to a given symbol in the sequence. Respective transition metrics are determined for state transitions that link the one or more possible states for which the old state metrics were found to at least some of the possible states of the encoding system that correspond to a succeeding one of the symbols in the sequence. New state metrics are computed for the at least some of the possible states that correspond to the succeeding symbol, responsive to the respective old state metrics and to the transition metrics, such that when two or more of the transitions are linked to the same one of the possible states of the succeeding symbol, one of the transitions is chosen based on a criterion applied to the new state metrics. A su…
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