Phase-shift-keying demodulator and demodulation method using a period-width windowing technique

Abstract From the Canadian patent

A demodulator demodulates a PSK communications signal using a synchronizer, a period window detector and a logic device. The synchronizer provides a transition signal representing reference edges of the communication signal. The period window detector coupled to the synchronizer, establishes a time interval based on the period of the transition signal. Finally the logic device, having logic, inputs coupled to the outputs of the period-window detector yields a, logic output signal. The demodulator preferably includes a carrier boundary detector for framing messages and minimizing noise detection in a manner that permits signal strength measurements over a wide dynamic range.