Multi-phase PSK demodulator

Details Multi-phase PSK demodulator Multi-phase PSK demodulator

1975-09-24

1976-09-28

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 325320, 331 12, 331 14, H03D 300

Patent

active

039834999

ABSTRACT:
A synchronized carrier recovery circuit for a PSK modulated signal includes a plurality of phase detectors supplied with the PSK input signal and phase shifted outputs from a voltage controlled oscillator. The detector outputs are rectified and alternately coupled to a pair of adders whose outputs feed a complimentary subtractor. The detector outputs are also converted to digital form and fed to an Exclusive OR circuit, whose output couples the appropriate subtractor outputs to the VCO to achieve phase locked synchronization.

REFERENCES:
patent: 3878475 (1975-04-01), Okano et al.
patent: 3924197 (1975-12-01), Okano et al.

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