Demodulator with selectable coherent and differential data
US5553098A · kind A · utility
59Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 12, 1994 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Apr 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0055
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A selectable demodulator (32) operates in the phase domain to implement a coherent demodulation path (40) and a differentially coherent demodulation path (42). The coherent path (40) includes a differential encoder circuit (46) to produce coherently demodulated differential data. Magnitude converters (62, 62') convert phase errors in each path into magnitude values. A comparison circuit (66) compares magnitude values from the two paths (40, 42) and selects the path encountering the least phase error. A selection circuit (60) provides data codes demodulated in accordance with the selection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.