The Communication Systems Based on an Enhanced VWDK Technique: Performance Analysis and the Application on Amplitude Modulation

Developing high efficient modulation technique has played an important role in the field of communication. In recent years, various modulation techniques have being brought out. The technique of ultra narrow bandwidth, with high efficiency in bandwidth and high suppression to sidebands as the main highlights, has developed particularly rapidly. This paper modifies the very-minimum waveform difference keying (VWDK), which is a key technique in ultra narrow bandwidth, proposes a new expression of waveform, which has higher efficiency, and applies it in traditional amplitude modulation systems. The new systems combing with VWDK and amplitude modulation can transmit the analog signals with high speed digital signals by the carriers.