DEMODULATOR FOR COMMUNICATION SYSTEM WITH DOUBLE PHASE MODULATION Russian patent published in 2009 - IPC H04L27/10 H04L27/22 

FIELD: physics; communications.

SUBSTANCE: invention relates to high-speed devices for demodulating signals with double phase modulation and can be used in communication systems for various purposes (satellite, cable, radio relay etc) with the aim of increasing efficiency of the demodulator in conditions of large mismatch of frequency of the input and reference signals. The demodulator for a communication system with double phase modulation comprises a first, second, third and fourth multipliers, first, second, third and fourth lowpass filters, first and second limiters, subtracting unit, first and second adders, loop filter, switch, saw-tooth voltage generator, frequency controlled generator, quarter phase changer, first and second squaring devices, first and second comparators, beat signal level detector, high-pass filter and logic analyser.

EFFECT: simpler and more stable operation of the device, wider range of rates of received data in the low frequency region, prevention of false capturing and improved dynamic properties the loop of tracking the demodulator.

4 dwg, 1 tbl