有信道编码，调制，信道估计等，是学习PCA特征提取的很好的学习资料，包括最后计算压缩图像的峰值信噪比和压缩效果的源码。- Channel coding, modulation, channel estimation, Is a good learning materials to learn PCA feature extraction, Including the final calculation of the compressed image peak signal to noise ratio and compression of the source.