多电平差错概率在同一张图上仿真多幅度电平PAM在M=2,4,8，16时符号的差错概率，信噪比0:25-Multi-level error probability

在同一张图上仿真多幅度电平M电平PAM在M=2,4,8,16时的符号差错概率。-In the same graph simulation multi-level rate of M-level PAM at M = 2,4,8,16 when the symbol error probability.

用于MATLAB作图中，多张图的合并（里面的文件路径需要根据需要更改）-For the MATLAB plot, the multiple number of pictures merger (inside the file path needs to be changed as needed)