基于小波和奇异值低阶近似的OFDM信道估计方法  

OFDM Channel Estimation Method Based on Wavelet and SVD Low Rank Approximation

作　　者：阙大顺[1] 史留成[1] 

机构地区：[1]武汉理工大学信息学院,湖北武汉430063

出　　处：《电脑与信息技术》2007年第2期1-3,59,共4页Computer and Information Technology

基　　金：湖北省自然科学基金资助项目(2004ABA045)

摘　　要：为了提高信道估计算法的准确性和简化计算量,提出了结合小波去噪和奇异值分解的MMSE低阶近似的信道估计方法,先将LS信道估计的结果进行小波去噪,然后将其运用在基于奇异值分解的MMSE低阶近似方法中,最后通过插值算法实现所有子信道的估计。理论分析及仿真证明了本算法的有效性及优越性。A new method of OFDM channel estimation combining wavelet-based denoising and SVD-based MMSE low rank approximation is proposed.Firstly,noise reduction is operated on the outcome of LS estimation,and then the processed outcome is used in the svn-based MMSE low rank approximation,finally,all sub-channels estimation is gained by interpolation.The approximation ranks in the method is changeable and simulation result shows the superior performance.

关 键 词：小波去噪 奇异值 低阶近似 MMSE 信道估计 OFDM 

分 类 号：TN911[电子电信—通信与信息系统]