Transmission system and modem utilizing coded modulation
US5604772A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1996 |
| Grant date | Feb 18, 1997 |
| Priority date | — |
| Expiry date | Mar 12, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3438
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The transmission system and the modem according to the invention use trellis-coded modulation based on a constellation split up into N sub-sets. For each received symbol in this constellation a decision arrangement makes it possible to determine the combination of the N points closest to the received symbol in each of the N sub-sets. Therefore, the constellation is split up into zones corresponding each to a given combination, and the arrangement comprises a zone searching module (2) in which any received point is situated. This module then controls the reading of a Table (3) which gives a combination of points which combination corresponds to this zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.