Adaptive Composite Phases Modulation/Demodulation Based on Transform Domain Communication System

Transform domain communication system (TDCS) is a cognitive anti-interference system that can dynamically generate interference-orthogonal waveform. However, the low spectrum efficiency of the cyclic code shift keying limits its potential practical applications. Besides, TDCS only provides adaptive waveform rather than adaptive modulation. In this paper, an adaptive composite phases modulation/demodulation method is proposed to solve the low spectrum efficiency problem. Compared with the existing methods, it can achieve a considerable high spectrum efficiency and adaptive transmitting rate without signaling overhead.