说明：  使用matlab实现相码、密勒码、CMI码的编码，且三种编码均为不少于128bit的二进制数字序列，并画出编码前后的波形和功率谱，分析各传输码型的优点以及密勒码和双相码的关系。
(Matlab is used to realize the coding of phase code, Miller code and CMI code, and the three codes are binary digital sequences with no less than 128bit. The waveform and power spectrum before and after coding are drawn. The advantages of each transmission code type and the relationship between Miller code and biphasic code are analyzed.)