Self-synchronizing interleaver for trellis encoder used in wireline modems
US4677626A · kind A · utility
41Cited by
2References
2Claims
0Family size
Assignee
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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 trellis coder with k-baud delay units is used for forward error correction. The output of the encoder is modulated using QAM to generate sequential baud signal elements. The redundant data bits generated are distributed among several non-consecutive bauds. 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.