Coherent phase shift keyed demodulator
US4871974A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1988 |
| Grant date | Oct 3, 1989 |
| Priority date | — |
| Expiry date | Dec 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2275
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A demodulator mechanism which uses estimates of the in-phase and quadrature-phase components of differential phase modulated carrier signals for performing a coherent demodulation of these signals is described. The instantaneous estimates, obtained from an estimator circuit, are fed into a differential carrier recovery circuit, which provides for a feedback of ideal sine and cosine components, and combined with the instantaneous estimates for incrementally decreasing a phase error signal generated in a computational circuit. By thus incrementally decreasing the phase error signal, an ideal phase angle is eventually obtained, thereby providing for coherent demodulated output components of the input carrier signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.