Quarternary differential PSK demodulator

Details Quarternary differential PSK demodulator Quarternary differential PSK demodulator

1985-07-22

1986-09-30

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 81, 375 83, 375120, 370 58, 370100, H04L 2722

Patent

active

046149104

ABSTRACT:
In a quarternary differential PSK demodulator, a QPSK input signal is applied to first and second synchronous detectors to which carriers with a 90-degree phase difference therebetween are respectively applied from a voltage-controlled oscillator. A first double-balanced phase detector multiplies the outputs from the synchronous detectors. A second phase detector squares the output of the second synchronous detector. A third double-balanced phase detector provides multiplication of the outputs of the first and second double-balanced phase detectors to generate an output having four times the frequency of the outputs of the synchronous detectors to cancel the information carried by the input PSK signal. A loop filter converts the output of the third phase detector to a DC phase control signal to be applied to the voltage-controlled oscillator.

REFERENCES:
patent: 3993956 (1976-11-01), Gilmore et al.
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4100499 (1978-07-01), Monrolin
patent: 4344178 (1982-08-01), Waters

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