Distributed trellis encoder
US4677625A · kind A · utility
77Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1985 |
| Grant date | Jun 30, 1987 |
| Priority date | — |
| Expiry date | Mar 1, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/33
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In the transmitter of a data communication system using QAM, a plurality of trellis coders with delay units are used for forward error correction. The output of each encoder is modulated using QAM to generate sequential baud signal elements. The redundant data bits generated are distributed between several non-consecutive bauds. Likewise, at the receiver a plurality of distributed convolutional decoders are utilized to decode the received signal element. The distributed trellis decoder is self-synchronizing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.