一种用于实际OFDM系统的次优信道估计算法  

A Sub-optimal Channel Estimation Algorithm for Practical OFDM Systems

作　　者：唐恬[1] 姜军[1] 张平[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《无线电工程》2007年第3期25-27,46,共4页Radio Engineering

基　　金：国家自然基金;贝尔实验室中国研究院联系资助项目(60302025)

摘　　要：基于对实际系统中信道冲激响应(CIR)泄漏问题的详细分析,提出了一种次优的时域信道估计算法。该算法克服了CIR泄漏的影响,因此能够很好地适应实际系统中的非整数采样多径衰落信道。该算法不需要预先知道信道统计特性,还具有低复杂度的特点。与已有信道估计算法进行了仿真比较,结果证明该算法极大地降低了信道估计MSE值,同时也不存在“地板效应”。Based on the detailed analysis of the channel impulse response（CIR） leakage in the practical OFDM systems,a sub-optimal time domain channel estimation algorithm is proposed. With low complexity, the proposed algorithm overcomes the effect of CIR leakage, and therefore is adapt to non-sample-spaced muhipath fading channels. No prior channel statistics is needed for the proposed algorithm. The comparison has been done between the proposed algorithm and the existing channel estimation algorithms. Simulation results show the extremely improved MSE performance and the inexistence of floor effect by the proposed algorithm.

关 键 词：正交频分复用 信道估计 信道冲激响应泄漏 多径衰落 

分 类 号：TN929.5[电子电信—通信与信息系统]