Transmission system using block-coded or trellis-coded modulations, receiver and decoder for such a system
US5619540A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1994 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Aug 1, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M13/25
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A decoder for a series of received digital signal samples which are encoded as points in a 2-dimensional constellation of points corresponding to authorized code values, which constellation is sub-divided into a plurality of subsets. The branch length .mu. between a received point and the closest authorized point in a subset is calculated as a function of the magnitude and sign of the error distance between the received point and the closest authorized point of the constellation, and of the displacement between successive authorized points in the subsets. It is thus possible to determine branch length without calculation of squared values and without employing any approximations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.