Synchronous differentially coherent PSK demodulation

摘要

A synchronous differentially coherent PSK communication signal is demodulated by applying the signal to a phase lock loop circuit whose output is sampled once every bit period in accordance with a sample control signal which is generated each time phase lock is lost as a result of the change in phase of the communication signal, as determined by comparing the phase of the communication signal with that of the phase lock loop tracking signal, phase lock being lost and restored during each bit period.