1. Software version

MATLAB2013b

2. Algorithmic theory

    CPM The modulation method belongs to a continuous phase modulation method , It transmits information through instantaneous phase information . therefore , Its symbol is in the conversion process , The phases are still continuous , So by CPM Modulation mode , It can achieve low energy consumption , High spectrum utilization .

        CPM The biggest advantage of the signal is its high spectrum utilization , When the transmitted symbol is equal probability ,CPM The power spectrum expression of the signal is ：

CPM Spectrum characteristics of modulated signal ： 

        chart a It represents the binary of different pulse shaping functions CPM Power spectral density curve , It uses raised cosine pulse modulation signal , Its side lobe drops faster , The frequency of Angelica unification is greater than 1 When , The side lobe has fallen to -60W/Hz about . And when L The bigger , It declines faster . thus it can be seen ,CPM The spectrum efficiency of the signal is relative to the traditional MSK And other modulation methods have obvious advantages . chart (b) It is expressed in different modulation indices h Power spectral density curve under , It can be seen from the picture that ࿰