一种基于频域加窗的OFDM信道估计算法  

A Channel Estimation Algorithm for OFDM Based on Frequency Domain Windowing

作　　者：唐恬[1] 张治[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：《电子与信息学报》2007年第12期2930-2933,共4页Journal of Electronics & Information Technology

基　　金：国家自然科学基金和贝尔实验室中国研究院联合(60302025)资助项目

摘　　要：该文分析了实际OFDM系统时域信道估计中的信道冲激响应(CIR)泄漏问题。提出了一种新的OFDM时域信道估计算法,利用频域加窗降低CIR泄漏,对CIR进行过门限判决,最大限度删除CIR中的噪声。在非整数采样多径衰落信道下与已有的OFDM时域信道估计算法进行了仿真对比,证明该算法有效降低了信道估计MSE值,改善了系统BER性能。The leakage of Channel Impulse Response （CIR） in the time domain channel estimation for the practical OFDM systems is analyzed. A novel channel estimation algorithm in the time domain is proposed for OFDM. The frequency domain windowing is used to reduce the leakage of CIR. The noise of CIR is direct cut according to a threshold. Comparison has been done between the proposed algorithm and the existing time domain channel estimation algorithms in the non-sample-spaced multipath fading channel. Simulation results show the decreasing of channel estimation MSE and the improvement of BER performance by the proposed algorithm.

关 键 词：正交频分复用 信道估计 加窗 

分 类 号：TN929.5[电子电信—通信与信息系统]