MULTI-VALUE MODULATION DEVICE, MULTI-VALUE DEMODULATION DEVICE, MULTI-VALUE MODULATION/DEMODULATION COMMUNICATION SYSTEM, MODULATION/DEMODULATION PROGRAM THEREFOR AND MODULATION/DEMODULATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a QAM modulation system capable of setting a multi-value number to approximate 2<(p+0.25)> (p is an integer equal to or more than 3) or 2<(p+q/n)> . SOLUTION: Input data signals of 4p+1 bits are converted into four signals of p+1 bits in a predetermined relationship and assigned to four phase planes, respectively. They are time-division multiplexed and multivalue-modulated. Thereby, it becomes possible to set the multi-value number to approximate 2<(p+0.25)> .