用matlab实现的曼彻斯特 zQHXXU编码。50 占空比（可调）。绘制时域波形和频域功率谱密度。结果跟北邮的GiKtUof 的通信原理课件上的形状一模一样。 .-With Manchester zQHXXU encoding matlab realize. 50 duty cycle (adjustable) . Draw time-domain waveform and frequency domain power spectral density. Results with BUPTGiKtUof Exactly the same shape Wenbin communication on the principles of courseware.