Demodulator for psk-modulated signals

Details Demodulator for psk-modulated signals Demodulator for psk-modulated signals

H - Electricity

03

D

329/15

H03D 3/00 (2006.01) H04L 27/22 (2006.01)

Patent

CA 1306516

ABSTRACT OF THE INVENTION A demodulator is disclosed for a PSK-modulated transmission signal in which the time average value of the frequencies thereof are 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 reference count number. The subtractor output is converted to an analog signal which controls the local oscillator frequency.

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