实现了图像的加水印，去噪，加噪声等功能，详细画出了时域和频域的相关图，ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块。- Realize image watermarking, de-noising, plus noise and other functions, Correlation diagram shown in detail the time domain and frequency domain, ofdm system simulation including 16