64/256 quadrature amplitude modulation trellis coded modulation decoder
US6269129A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1998 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0069
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A quadrature amplitude modulation (QAM) trellis coded modulation (TCM) decoder for decoding a stream of QAM TCM signals is disclosed. Each of the signals has a plurality of associated branch metrics and has an in-phase component and a quadrature component. The in-phase component is defined by a plurality of in-phase symbols and the quadrature component is defined by a plurality of quadrature symbols. The QAM TCM decoder includes a first Viterbi decoder and a second Viterbi decoder. The first Viterbi decoder is configured to receive an in-phase component of a QAM TCM signal for decoding the associated in-phase symbols into an in-phase decoded bit and a plurality of uncoded in-phase bits. The second Viterbi decoder configured to receive a quadrature component of the QAM TCM signal for decoding the associated quadrature symbols into a quadrature decoded bit and a plurality of uncoded quadrature bits. The first and second Viterbi decoders are adapted to decode 64- or 256-QAM TCM signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.