PSK DEMODULATOR AND QPSK DEMODULATOR

摘要

PURPOSE: To provide a PSK demodulator from which correct demodulation data are obtained even when an inverted spectrum of a PSK modulation signal is received. ;CONSTITUTION: The demodulator is made up of a detection circuit 2 inputting a PSK modulation signal and outputting two orthogonal base signals, an intersection circuit 3 intersecting two orthogonal base signals, and an identification device 4 identifying an output signal of the intersection circuit 3. When the PSK modulation whose spectrum is not inverted is received, the intersection circuit 3 provides an output of the two orthogonal base signals without any modification and when the PSK modulation signal whose spectrum is inverted is received, the intersection circuit 3 provides an output of two orthogonal base signals while replacing them with each other.;COPYRIGHT: (C)1994,JPO