Matched filter for combating multipath fading
US4519084A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 29, 1982 |
| Grant date | May 21, 1985 |
| Priority date | — |
| Expiry date | Sep 29, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A carrier and timing recovery technique is disclosed for combating the phase effects of multipath fading occurring during radio transmission. The technique is based on a known mathematical model of multipath fading. A test variable generator (26) develops a number of test variables whose relationship characterizes the multipath distortion. A processor (27) derives a plurality of coefficients of weighting measures from the test variables. The coefficients serve to adjust a matched filter (28) to provide greater use of those portions of the received radio signal yielding higher signal-to-noise ratios than those portions with lesser yields, as well as to compensate for multipath phase perturbations. The technique is also compatible with maximum-likelihood sequence detection techniques to provide further compensation for multipath fading effects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.