改进的MB-OFDM UWB信道估计算法  

An Improved Channel Estimation Algorithm for MB-OFDM UWB System

作　　者：张先玉[1] 刘郁林[1] 

机构地区：[1]重庆通信学院DSP实验室,400035

出　　处：《微波学报》2010年第S1期666-670,共5页Journal of Microwaves

基　　金：国家自然科学基金(60672157);重庆市自然科学基金(CSTC2009BB2028)

摘　　要：在MB-OFDM UWB系统中,传统的信道估计方法没有充分利用信道长度这一信息,估计信道长度常大于实际长度,造成了性能损失。针对这一缺陷,提出一种新的信道估计算法。首先利用LS算法估计出信道,然后通过信号能量估计(SEE)方法估计出信道长度。算法有效地降低了估计维数,因此提高了LS算法的估计性能,同时对各算法的性能进行了分析比较。最后利用实验仿真证实了算法的有效性和分析的正确性。As the traditional channel estimation algorithms for MB-OFDM UWB system haven’t utilized the knowledge of channel length,the estimated channel length is always longer than the real one.To overcome the shortcoming, an improved channel estimation algorithm is proposed in this paper.The proposed algorithm exploits Least Squares(LS) technique for channel estimation and Signal Energy Estimation(SEE)to estimate the channel length.It effectively reduces the estimation dimensions of the signal subspace,and hence improves the estimation performance.Then the performance of the algorithms is analyzed.Finally,the performance of the algorithm and correctness of the analysis are proved by simulations.

关 键 词：多频带正交频分复用 超宽带 信道估计 信号能量估计 

分 类 号：TN925[电子电信—通信与信息系统]