一种基于信道缩短的MB-OFDM UWB稀疏信道估计算法  

A new sparse channel estimation algorithm for MB-OFDM UWB systems based on channel shortening

作　　者：朱行涛[1] 刘郁林[1] 蔡凯[1] 杨磊[1] 

机构地区：[1]重庆通信学院,重庆400035

出　　处：《电路与系统学报》2010年第5期127-130,共4页Journal of Circuits and Systems

基　　金：国家自然科学基金资助项目(60672157;60672158)

摘　　要：在MB-OFDMUWB系统中,利用UWB信道的稀疏簇特性,提出一种基于信道缩短的MB-UWB稀疏信道估计算法。首先利用信道缩短滤波器来消除由于循环前缀长度不足造成信道间干扰和码间干扰,然后基于信道缩短后的接收信号,利用UWB信道的稀疏性,探测出非零值抽头的位置,避免了无谓的零值抽头估计,改善了算法的性能。仿真结果表明:当循环前缀CP长度小于信道长度时,LS算法和DFT算法逐渐失效,而新算法可以获得较好的估计性能。In this paper, a novel sparse channel estimation algorithm based on channel shortening is proposed for multi-band OFDM ultra wide-band communications. In this algorithm, channel shortening is first used to cancel the inter symbol interference （ISI） and the inter carrier interference （ICI） resulted in the shortage of length of cyclic prefix. Then the sparse structure property of UWB channel is used to detect the non-zero tap which avoids non-important zero taps＇ estimation and promotes the performance of the algorithm. Simulation results demonstrate that the LS algorithm and the DFT algorithm wouldn＇t estimate the channel correctly when the length of cyclic prefix is shorter than the length of channel, while the new algorithm has good preference.

关 键 词：UWB OFDM 信道缩短 稀疏信道 信道估计 

分 类 号：TN911.5[电子电信—通信与信息系统]