Coherent detector for QPSK modulation in a TDMA system
US5067139A · kind A · utility
11Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 17, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Dec 17, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0069
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The .pi./4-QPSK coherent detector of the present invention has a vector input and an output comprising recovered data in bit pair form. The .pi./4-QPSK coherent detector recovers bursts of data, in a TDMA system, that has been encoded in an amplitude modulated vector's phase angle. The .pi./4-QPSK coherent detector detects the .pi./4-QPSK constellation of the incoming modulated signal and outputs the recovered data stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.