对于一个1阶AR过程，已知其自相关序列。观测数据包含期望信号和零均值的不相关白噪声

a. 编写设计p阶FIR维纳滤波器的Matlab程序，要求能返回滤波器系数和均方误差；

b. 分别计算均方误差，并比较这些误差的大小

c. 画出均方误差的值

-For a one order AR process, which is known autocorrelation sequence. Observation data contains the desired signal and uncorrelated white noise with zero mean and complete the corresponding requirements