Demodulator for PSK-modulated signals

Details Demodulator for PSK-modulated signals Demodulator for PSK-modulated signals

1987-09-08

1989-05-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 83, 375 97, 329122, H04L 2722

Patent

active

048274887

ABSTRACT:
A demodulator is disclosed for a PSK-modulated transmission signal in which the time average value of the frequencies thereof ar equal to the carrier frequency. A mixer receives and mixes the PSK-modulated transmission signal with a signal from a local variable frequency oscillator and the output thereof is converted to a square wave which is used to reconstruct the original digital modulation data. A pulse counter receives and counts the square wave signal for every period of time which is n times a time slot of a digital signal and a subtractor provides a difference between the count value from the pulse counter and a reference count number. The subtractor output is converted to an analog signal which controls the local oscillator frequency.

REFERENCES:
patent: 4030045 (1977-06-01), Clark
patent: 4291332 (1981-09-01), Kato et al.
patent: 4316152 (1982-02-01), Meyer
patent: 4445224 (1984-04-01), Ihira et al.
patent: 4475216 (1984-10-01), Noguchi
patent: 4574244 (1986-03-01), Head
patent: 4591730 (1986-05-01), Pennoni
patent: 4591797 (1986-05-01), Tanimoto et al.
patent: 4644420 (1987-02-01), Buchan
patent: 4679003 (1987-07-01), Sagawa et al.
patent: 4680780 (1981-07-01), Agoston et al.

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