.pi./n shift phase-shift keying demodulator

Details .pi./n shift phase-shift keying demodulator .pi./n shift phase-shift keying demodulator

1998-03-25

1999-08-31

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 329310, 375324, 375332, H03D 300, H04L 2722

Patent

active

059458755

ABSTRACT:
A .pi.
shift PSK demodulator of this invention is formed with a digital logical means through the following method. XOR4 calculates the ex-OR operation between the present sample through .pi./4 shift QPSK output from SH2 and the previous one output from SH1. Accumulating 1 among the outputs from XOR4 in the first operation means 5 and multiplying it by .pi./8 obtains the absolute phase difference between the present and the previous symbols. The former or latter four bits from SH1 are subtracted from the corresponding former or latter four bits from SH2, and the result of each bit is summed and its sign is added to the absolute phase data in sign addition means 10. After the phase offset is subtracted from the outputs from 10, it is demodulated into the original one in judgment circuit 13.

REFERENCES:
patent: 3997847 (1976-12-01), Tong

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