说明：  有信道编码，调制，信道估计等，包括最后计算压缩图像的峰值信噪比和压缩效果的源码,ML法能够很好的估计信号的信噪比。
( Channel coding, modulation, channel estimation, Including the final calculation of the compressed image peak signal to noise ratio and compression of the source, ML estimation method can be a good signal to noise ratio.)