一种改进的分数间隔常数模盲均衡算法  

Improved Fractionally Spaced Constant Modulus Blind Equalization Algorithm

作　　者：李金明[1] 陆晶[2] 

机构地区：[1]西北工业大学航海学院,陕西西安710072 [2]武警工程学院电子技术系,陕西西安710086

出　　处：《计算机仿真》2012年第7期159-162,共4页Computer Simulation

基　　金：中国博士后科学基金(2010471856)

摘　　要：研究优化水声通信效果问题,改善水声信道性能,传统常数模盲均衡算法(CMA)的稳健性差,剩余均方误差大。为解决上述问题,提出了一种改进的分数间隔常数模盲均衡算法。新算法采用T/2分数间隔均衡器,针对水声通信中信噪比较低的特点,设计了一个新的误差函数,取代原算法中的误差函数。采用浅海水声信道对改进算法进行了计算机仿真,结果表明:改进算法在低信噪比条件下性能稳健,稳态误差低于常数模算法和分数间隔常数模算法,且具有较快的收敛速度。改进算法适用于信噪比较低的浅海水声信道。To improve the robustness and achieve lower residual mean square error of the constant modulus algo- rithm （CMA） in underwater acoustic channels, an improved fractionally-spaced constant modulus algorithm （IFSE- CMA） was proposed. The new algorithm employed 3/2 spaced sampling. The error function of CMA was replaced by a new one. The new error function was specifically designed for the low signal to noise ratio （SNR） which is common- ly encountered in the underwater acoustic communication. Computer simulations based on a shallow water acoustic channel demonstrate that the new algorithm has the advantages of robustness under low SNR, over perform baud- spaced CMA （BSE-CMA） and fractionally-spaced CMA （FSE-CMA） in aspect of residual mean square error, and has fast convergence rate. The improved algorithm is suitable for shallow water acoustic channel which has lower SNR.

关 键 词：水声信道 盲均衡 分数间隔 常数模 

分 类 号：TN911.5[电子电信—通信与信息系统]