符号内连续相位差分相移键控调制方法

提出了一种幅度准恒包络、相位连续的差分相移键控调制与解调方法.该方法设计了一组基带信号集合,根据输入的信息值和状态值选择基带信号来实现信号调制.在信号解调中,通过计算接收信号在一个符号持续时间内的相位变化累积量来判决发送信息.仿真结果表明,该调制方法具有良好的频谱特性和准恒包络特性,并且避免了本振偏离、多普勒频移等引起的符号间相位变化对信号解调的影响.

Inner Symbol Continuous Phase Differential Phase Shift Keying(ISCP-DPSK) Modulation

A method of differential phase shift keying(DPSK) with qu asi constant envelope and continuous phase is proposed. A set of baseband signal is designed i n advance. Modulation is realized by choosing a signal from the baseband signal set based on input bits and modulation state. Demodulation only needs to calcula te the phase shift cumulant of signal within the symbol duration. The simulation result demonstrates that the signal of proposed modulation occupies narrow RF s pectrum with quasi constant envelope and can be immune to the phase shift caused by Doppler, carrier frequency offset and so on.