摘要
基于最小均方误差准则,得到维纳-霍夫方程,并利用FIR(有限冲击响应)方法求解,进而得到维纳滤波器的传递函数。在MatLab环境下,基于一阶AR(自回归)模型生成原始信号,对维纳滤波器进行设计和仿真,并分析抽样点数、AR模型参数、信噪比和滤波器阶数对滤波效果的影响。仿真结果表明,增大抽样点数和信噪比以及减小AR模型参数,滤波效果增强;增大滤波器阶数,滤波效果先增强后减弱。
Wiener-hopf equation,which is based on minimum mean square error criterion,can be solved by FIR(Finite Impulse Response) method,and then the transfer function of Wiener filter can be got.In the MatLab environment,designs and the Wiener filter and simulates based on first-order AR(AutoRegressive) model which produces the original signal.Then the effects of sampling points,AR model parameters,analyses signal to noise ratio and filter order to the filtering effect.Results of simulation show that increasing the sampling points and the signal to noise ratio,reducing the AR model parameters the filtering will be enhanced,increasing the filter order,the filtering will be enhanced first and reduced then.
出处
《现代计算机》
2011年第16期10-13,共4页
Modern Computer
