Four phase psk demodulator

Details Four phase psk demodulator Four phase psk demodulator

H - Electricity

03

D

329/3

H03D 3/18 (2006.01) H03D 3/24 (2006.01) H03K 9/04 (2006.01) H04L 7/04 (2006.01) H04L 27/227 (2006.01)

Patent

CA 1256171

ABSTRACT OF THE DISCLOSURE A demodulator for regenerating and demodulating a carrier signal from a four-phase PSK received signal having a data symbol preamble and a fixed phase (one of four phases) of a particular time width using a synchronous detection type demodulating system (remodulation type demodulating system). The demodulator includes an orthogonal demodulating circuit and a remodulating circuit for regenerating a carrier signal which is the data signal during a preamble transmission period from a received modulated signal. The remodulating circuit includes a demodulator having an AFC circuit for detecting a frequency change using a narrow-band filter, means for suppressing frequency changes of the four-phase PSK modulated signal received and means for rendering constant the frequency of the regenerated carrier signal passing through the narrow-band filter.

512825

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