Trellis shaping for modulation systems
US5150381A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1989 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Oct 13, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/0042
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital data sequence is mapped into a signal point sequence for transmission, by selecting the signal point sequence from a subset of all possible signal point sequences based on the digital data sequence, all possible signal point sequences in the subset lying in a fundamental region of a trellis code, the fundamental region being other than a simple Cartesian product of finite-dimensional regions. In another aspect, a digital data sequence is mapped into a sequence of signal points for transmission, by specifying a class of possible sequences based on the digital data, and selecting the signal point sequence from the class, the selection being based on the respective average powers of the possible sequences of the class, the selection being based on not only a fixed-length block of the digital data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.