OFDM系统的盲信道估计  

Blind Channel Estimation for Orthogonal Frequency Division Multiplexing Systems

作　　者：冯立荣[1] 张志涌[1] 

机构地区：[1]南京邮电大学自动化学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2007年第2期20-23,共4页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(60172058)资助项目

摘　　要：正交频分复用(OFDM)系统中的盲信道估计对能否正确恢复信号起决定性作用,现有的算法存在计算复杂度高、精度低的缺点。为此提出了一种新算法,该算法充分利用时域和频域信息,其计算复杂度从指数次幂降到多项式,即使信道阶数未知也可获得较高的估计精度。本算法既适用于CP-OFDM中又适用ZP-OFDM中,并保证信道可辨识性不受信道位置影响。仿真表明,本文算法的性能优于子空间算法。Blind channel estimation is crucial for orthogonal frequency division multiplexing （OFDM） systems to correctly recover the transmitted signal. The existing algorithms are with disadvantages high computeration complexity of low accuracy. In this paper we propose a new algorithm making full use of the information in both time and frequency domains. The computation complexity is reduced from exponential order to polynomial order and high estimation precision can be achieved even if no knowledge of the exact channel order. The algorithm can be used in CP（cyclic prefix） and ZP（ zero padding） OFDM systems, with channel identification guaranteed regardless of channel location. Simulation results show that the proposed algorithm has better performance than subspace channel estimator.

关 键 词：OFDM 盲信道估计 子空间算法 

分 类 号：TN911.23[电子电信—通信与信息系统]