PHASE SHIFT KEYING DEMODULATOR AND DEMODULATION METHOD USING PERIOD WIDTH WINDOW TECHNIQUE

摘要

PROBLEM TO BE SOLVED: To provide a phase shift keying(PSK) modulator and a modulation method which use a period width window technique. SOLUTION: This demodulator 10 demodulates a PSK communication signal by using a synchronizer 12, a period window detector 20 and a logical device 22. The synchronizer 12 supplies a transition signal for indicating a reference edge of a communication synchronizer. A period window connected to the synchronizer 12 establishes a time period on the basis of a period of the transition signal. The logical device 22 which has input connected to output of the period window detector 20 generates a logical output signal. This demodulator 10 is equipped with a carrier wave boundary detector 34 for turning a message into a frame and minimizing detection of a noise, thus it becomes possible to measure a signal intensity oven a wide dynamic range.