中文说明： 给出接收信号眼图及系统仿真误码率，包括随机梯度算法，相对梯度算法，随机调制信号下的模拟ppm，包括调制，解调，信噪比计算，最小均方误差（MMSE）的算法，实现了图像的加水印，去噪，加噪声等功能。
English Description：
Eye-diagram and system simulation of bit error rate of the received signal is given, including stochastic gradient algorithm, algorithm of relative gradient, ppm under random modulation signal simulation, including modulation, demodulation, and signal to noise ratio, minimum mean square error (MMSE) algorithms, realize Image Watermarking, noise reduction, noise and so on.