Method and apparatus for detection of a communication signal
US5784416A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03407
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The disclosed communication unit functions to detect a signal by detecting the zero crossing of a current sample (and prior samples) and determining a sample value for each sample, and to determine an estimated bit value of a previous sample based on upper and lower node metrics. In the preferred embodiment a two-state decoder is used. Using prior sample values, the possible upper and lower node path distance metrics are first determined, then path difference metrics are determined for each node based on the path distance metrics. The difference metrics are then compared against a threshold, preferably zero, to determine the estimated bit value (or which surviving path to use) in decoding a prior sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.