Distortion-compensated digital communications receiver and method therefor
US6507628B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 7, 1999 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Sep 7, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03178
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital communication transmitter (30) implements a phase constellation (40) which defines a digital communication signal stream that is subsequently compressed (50), thereby introducing distortion into a communication signal (56) transmitted to a complementary receiver (30). The receiver (30) includes a magnitude adjuster (80) which increases the magnitude component of selected phase estimates to at least partially compensate for the compression distortion. The receiver also includes a branch metrics generator (90) having a segment (138) in which branch metric transfer function peaks and valleys are not positioned in receiver phase space to coincide with ideal phase points. The branch metric transfer functions are generated in accordance with a process (102) which bases branch metric calculations upon empirically determined probabilities that characterize system-induced distortions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.