Abstract
By modifying the modulated waveform, a new communication modulation method, which is called C-WQPSK, is proposed in this paper. This method based on direct carrier QPSK, didn’t consider baseband pulse signal, and redesigned the modulating waveform, its phase angle jump and jump to change duration time all can be changed. Results of the numerical tests indicate that, the method is correctness and effectiveness. Compared with direct carrier QPSK, the method can keep the BER performance, meanwhile, power spectrum decline rate, the energy of modulated carrier wave, and anti-interference ability are improved and enhanced, so it owns high theory significance and engineering application value.
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