A logic structure for phase-shift overlapped carrier-type digital communication system is disclosed. At the transmitter, the phase-shift overlapped carrier is transmitted through band-pass (or low-pass) filter into channel where it is added by noise. At the receiver, the mixture of signal and noise is received, passes through band-pass (or low-pass) filter and reverse filter and then decode. It can play the role of phase-shift overlapped carrier in excellent transmission characteristics to maximum. |