中文说明： 对于初学者具有参考意义，包括单边带、双边带、载波抑制及四倍频,实现了图像的加水印，去噪，加噪声等功能，ofdm系统仿真 含16qam调制 fft 加窗 加cp等模块，ldpc码的编解码实现，利用最小二乘法进行拟合多元非线性方程。
English Description：
Is useful for beginners, including unilateral, bilateral, carrier suppression and four times times the frequency, realize Image Watermarking, noise reduction, plus features such as noise, simulation of the OFDM system with 16qam modulation FFT window plus CP modules, codec implementation of LDPC codes using least square fitting nonlinear equation.