通过MATLAB仿真实现对M-PAM调制解调过程中M值不同的系统抗噪性能进行比较，绘制出抗噪性能曲线图-MATLAB simulation to compare the performance of anti-noise system with different values ​ ​ of M M-PAM modulation and demodulation process, draw the graph of the anti-noise performance.

在matlab下实现fft并绘制出图形 傅里叶变换 快速傅里叶变换-Under matlab fft and draw the graph Fourier Transform Fast Fourier Transform