| 时变条件下MIMO-OFDM系统中的信道估计算法 |
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| 引用本文： | 张晓瀛,黄勤飞,魏急波. 时变条件下MIMO-OFDM系统中的信道估计算法[J]. 电路与系统学报, 2009, 14(5) |
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| 作者姓名： | 张晓瀛 黄勤飞 魏急波 |
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| 作者单位： | 国防科技大学,电子科学与工程学院二系,湖南,长沙,410073 |
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| 摘 要： | 本文设计了时变多径衰落条件下MIMO-OFDM系统中一种新的信道估计算法.该算法结合递归EM算法和Kalman预测对时变信道进行跟踪.借助软球形译码器(List Sphere Decoder,LSD)产生的搜索列表,递归EM算法序贯遍历搜索列表中可能的符号组合来估计各个子载波上的信道频率响应;基于获得的信道频率响应估计,Kalman预测器利用衰落信道的时域二阶统计特性进一步跟踪信道时变.仿真结果表明:本文设计的算法可以有效跟踪信道时变,性能优于传统的软输入Kalman滤波算法.
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| 关 键 词： | EM算法(expectation-maximization) 软球形译码(list sphere decoder,LSD) |
Time-varying channel estimation for MIMO-OFDM systems |
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| ZHANG Xiao-ying,HUANG Qin-fei,WEI Ji-bo. Time-varying channel estimation for MIMO-OFDM systems[J]. Journal of Circuits and Systems, 2009, 14(5) |
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| Authors: | ZHANG Xiao-ying HUANG Qin-fei WEI Ji-bo |
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| Affiliation: | ZHANG Xiao-ying,HUANG Qin-fei,WEI Ji-bo(Institute of Electronic , Engineering,National Univ.of defense Technology,Changsha 410073,China) |
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| Abstract: | In this paper,a new channel estimation algorithm is proposed for MIMO-OFDM systems over the time-varying multipath fading channel.The recursive expectation-maximization(EM) algorithm and Kalman predictor are combined to track the time-varying channel.With the aid of the candidate list from list sphere decoder(LSD),the channel frequency response of each subcarrier is estimated by the recursive EM algorithm which uses sequential processing over all the significant symbol combinations in the limited candidate ... |
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| Keywords: | MIMO-OFDM |
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