多径信道中盲信道均衡的恒模算法

Constant Modulus Algorithm for Blind Channel Equalization Using Matlab

许多数字通信系统常受到由带限收发滤波器及多径效应引起的码间干扰,为达到可靠通信必须进行信道均衡,传统的方法是基于训练序列的信道均衡。近些年来盲信道均衡引起了人们极大的兴趣,其中应用最广泛的自适应均衡算法是盲信道均衡恒模算法。论述盲信道均衡恒模算法的基本原理,从恒模代价函数出发详细推导出盲信道均衡恒模算法并给出Matlab实现代码。计算机仿真证明此代码的有效性。

Many digital communication channels suffer from the problem of inter- symbol interference （LSI） as result of bandlimited transmitter receiver filtering and mulfipath propagation. To achieve reliable communication, channel equalization are necessary to deal with ISI. Tradition equalization methods are based on training sequences. In the last few years, blind equalization techniques have gained an increasing interest. The most popular blind adaptation algorithm is the constant modulus algorithm（CMA）. This paper presents constant modulus algorithm（CMA） for blind of bandlimited with ISI. It derives bend adapfion equalization CMA algorithm from constant modulus cost function and implemented CMA by Matlab code. And shows that our proposed Matlab code of CMA is effective for ISI channels by computer simulation.