基于小波变换的非线性信道判决反馈均衡算法  

A New Nonlinear Decision Feedback Equalization Algorithm Based on Wavelet Transform

作　　者：王军锋[1] 张彬[1] 宋国乡[1] 

机构地区：[1]西安电子科技大学理学院数学系,陕西西安710071

出　　处：《系统工程与电子技术》2002年第12期118-120,共3页Systems Engineering and Electronics

摘　　要：针对严重线性失真和轻度非线性失真的数字信道 ,在分析一种基于关联模型的非线性信道判决反馈均衡器的基础上 ,提出用正交小波表示非线性信道判决反馈均衡器并给出了自适应均衡算法。该算法的优点是将小波变换与关联模型相结合 ,利用小波变换的去相关能力在小波域中通过归一化的最小均方误差 (LMS)算法来提高收敛速度 ,计算量增加不多 ,易于实时实现。仿真结果表明 。After the analysis of a decision feedback equalizer based on the associated model, a new decision feedback equalizer employing wavelet transform is presented for a nonlinear channel with severe linear distortion and mild nonlinear distortion. Since wavelet transform has a better decorrelation perfermance and is easily combined with an associated model, the convergence speed of the new algorithm is improved by normalized least mean square algorithm in wavelet domain. For a typical nonlinear channel model ,simulation shows that the new algorithm has a good convergence property, while the increase in the computational complexity is slow.\;

关 键 词：小波变换 非线性信道 判决反馈 均衡算法 自适应均衡 数字通信 

分 类 号：TN911.5[电子电信—通信与信息系统]