单边带调制，加入大噪声和小噪声的区别，可以解调加入噪声的调制信号，观看两种效果，在频域条件下进行比较。注：需要fftseq函数调用。-Single sideband modulation, noise added to the large and small noise difference, you can join the demodulation of the modulation signal noise to watch the two effects, in the frequenc