Technique for determining signal dispersion characteristics in communications systems
US4980767A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1990 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Mar 14, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention covers the notion of determining signal dispersion characteristics, such as amplitude, phase and delay, by transmitting training sequences. More specifically, each sequence comprises a plurality of predetermined symbols and is transmitted two or more times. Detection of each training sequence is provided by a correlator at the receiver. This detection creates a signal peak for each training sequence at the output of the correlator. Between the peaks, a "quiet zone" is created which permits signal dispersion in this zone to be characterizerd with respect to amplitude, phase and delay. Two different quiet zones are utilized to resolve ambiguities which arise in determining the aforesaid signal dispersion characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.