Circuit for demodulating PSK modulated signal by differential-de

Details Circuit for demodulating PSK modulated signal by differential-de Circuit for demodulating PSK modulated signal by differential-de

1991-03-22

1992-03-17

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329310, 375 82, 375 85, H03D 318

Patent

active

050972200

ABSTRACT:
In a demodulator circuit which is simple in construction, a PSK modulated signal is converted in frequency into a quasi-base band signal and is then subjected to complex separation. Partly since a phase angle sampled from a digital complex signal is supplied to a differential-detector circuit, and partly since the differential-detector circuit processes only the phase angle, the differential-detector circuit has a simple construction. As the detected phase difference between two successive symbol data, an error between a carrier wave contained in the modulated signal and a locally oscillated frequency on the receiving side is compensated and is outputted as a digital demodulated signal.

REFERENCES:
patent: 4879728 (1989-11-01), Tarallo
patent: 4912422 (1990-03-01), Kobayashi et al.
patent: 4959619 (1990-09-01), Delacroix et al.

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