中文说明：MATLAB实现BPSK，以及频谱图。通过设置采样频率，带宽等参数，通过I,Q两路进行零中频的信号调制，代码包含时域图，频谱图。
English Description：
BPSK is realized by MATLAB, and the spectrum diagram is given. By setting sampling frequency, bandwidth and other parameters, through I, Q two-way zero IF signal modulation, code includes time domain diagram, spectrum diagram.