基于不同相位脉冲调制的CPM信号性能研究

Study on the performance of CPM based on different phase pulse

针对现代数字通信系统下频谱资源日益紧缺的问题,研究了不同相位脉冲调制的CPM信号的频谱特性和误码性能。首先列出了矩形脉冲、升余弦脉冲以及高斯最小频移键控脉冲3种常用CPM相位脉冲函数的一般形式,并给出了对应调制信号的功率谱密度分布;在此基础上,基于最小欧氏距离研究了3种相位脉冲调制的CPM信号误码性能,并做了仿真对比。仿真结果表明:高斯最小频移键控脉冲调制的CPM信号具有优良的频谱特性,且误码性能较好,实际工程中可以根据客观要求选择不同的相位脉冲调制方式,使系统在有效性和可靠性之间取得合理折中。

Aiming at the problem of increasingly scarce spectrum resources in the modern digital communication system,the spectrum characteristics and error performance of continuous phase modulation signals were discuss in this paper.First of all,the general form of CPM signal with three kinds of phase pulses is presented respectively,and the power spectrum density distribution of the modulated signal is obtained.And then,based on the minimum Euclidean distance,error performance of three kinds of CPM signals is studied.Simulation results show that：the CPM signal with Gauss′s minimum frequency shift keying pulse has more prominence both on spectral characteristics and the error performance compared with the other types.In practical engineering,choose applicable phase pulse modulation method according to the objective requirement.Finally,the system can get a reasonable compromise between validity and reliability.