Self-synchronizing de-interleaver for viterbi decoder used in wireline modems
US4677624A · kind A · utility
12Cited by
1References
3Claims
0Family size
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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 primaryH04L27/3427
- WIPO fieldDigital communication
- 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 among several non-consecutive bauds. At the receiver a distributed convolutional decoder individually addressed having sectioned memory elements is 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.