一种新的基于小波基的时变信道估计  

A Novel Time-varying Channel Estimation Based on Wavelet

作　　者：徐睿 袁伟娜[1] 王建玲[1] XU Rui;YUAN Weina;WANG Jianling(School of Information Science and Engineering,East China University of Science and Technology, Shanghai 200237, Chin)

机构地区：[1]华东理工大学信息科学与工程学院,上海200237

出　　处：《铁道学报》2018年第5期90-96,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(61501187);中央高校基本科研业务费(222201714032)

摘　　要：基扩展模型是最常用的快时变信道建模方法之一,而基函数的选取决定了建模的准确性。本文在多分辨率分析和Mallat算法的基础上,提出一种基于小波尺度函数构造基函数的方法,该方法采用Daubechies、Symlet、Coiflet小波的尺度函数进行快时变信道拟合。理论分析和仿真结果均表明,采用本文提出的基函数拟合时变信道,其信道估计性能优于基于传统的CE-BEM、GCE-BEM、P-BEM、DCT-BEM等模型的信道估计性能,复杂度低于DKL-BEM、DPS-BEM模型。相比于其他利用小波尺度函数构造的基函数,利用Sym2小波尺度函数构造的基函数的性能最优。Basis expansion model is one of the most commonly used modeling methods for rapidly time-varying channels,and the choice of basis functions determines the accuracy of the modeling.Based on multiresolution analysis and Mallat algorithm,this paper proposed a basis function constructing method using wavelet scaling functions,which used Daubechies,Symlet,Coiflet wavelet scaling functions for rapidly time-varying channel fitting.Theoretical analysis and simulation results show that,using the proposed basis functions to fit time-varying channels,the performance of channel estimation is better than that of traditional CE-BEM,GCE-BEM,P-BEM,DCT-BEM models,while the complexity is lower than that of DKL-BEM,DPS-BEM models.Compared with other basis functions constructed by wavelet scaling function,the performance of basis function constructed by Sym2 wavelet scaling function is optimal.

关 键 词：信道估计 OFDM 基函数 基扩展模型 尺度函数 

分 类 号：TN929.5[电子电信—通信与信息系统]