Coherent detector for QPSK modulation in a TDMA system

Details Coherent detector for QPSK modulation in a TDMA system Coherent detector for QPSK modulation in a TDMA system

1990-12-17

1991-11-19

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 97, 329304, H04L 2722

Patent

active

050671391

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.

REFERENCES:
patent: 4466108 (1984-08-01), Rhodes
patent: 4653071 (1987-03-01), Sgrignoli
patent: 4795986 (1989-01-01), Ceroni et al.
patent: 4896336 (1990-01-01), Henely et al.
patent: 4916405 (1990-04-01), Keate et al.
patent: 4959844 (1990-09-01), Walp
patent: 4965810 (1990-10-01), Peischl et al.

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