Acta Scientiarum Naturalium Universitatis Pekinensis

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Doubly Selective Channel Estimation Based on Fractional Basis Expansion Model

LIU Yingnan1 , JIANG Wei1 , YAO Chunguang2 , WANG Wujun1 , LIANG Qinglin1    

  1. 1 School of Electronics Engineering and Computer Science, Peking University, Beijing 100871; 2 Electronic Science and Engineer College, National University of Defense Technology, Changsha 410073;
  • Received:2007-04-16 Online:2008-01-20 Published:2008-01-20

基于分数倍基扩展模型的双选信道估计方法

刘英男1,蒋伟1,姚春光2,王武军1,梁庆林1   

  1. 1 北京大学信息科学与技术学院,北京100871;2 国防科技大学电子科学与工程学院,长沙410073;

Abstract: By analyzing the relationship between basis expansion model (BEM) and Doppler spectrum, the authors propose a scheme based on fractional BEM for the estimation of doubly selective channel parameters. When the receiver detects the maximum frequency of Doppler-spread, the frequency of BEM is modified by a factor of 1/K, and improved mean-square error of channel can be obtained.

Key words: channel estimation, doubly selective channel, basis expansion model (BEM), mean-square error

摘要: 通过分析复指数基扩展模型(BEM)与多普勒扩展频谱之间的关系,提出一种基于分数倍基扩展模型的双选信道估计方法。当接收机能够获得最大多普勒频率值时(可以通过自身运动速度等计算或者作相应估计),通过相应调整BEM基频率为原来的1/K倍,信道估计的均方误差性能得到明显改善。另外,还提出了重叠利用训练符号的改进算法,研究表明改进算法可以进一步提高信道估计的质量。

关键词: 信道估计, 双选信道, 基扩展模型, 均方误差

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