一种基于判决反馈的半盲信道估计方法

无线移动通信MIMO－OFDM系统中，为了减小对导频的依赖性，针对平坦瑞利衰落信道提出了一种基于判决反馈的半盲信道估计方法。该方法使用LS算法结合导频对信道进行初始估计，然后利用初始的信道估计结果得到下一个OFDM符号对应的天线发送信号，最后利用自适应滤波稳态跟踪特性对后面的信道进行跟踪，并将恢复出的信号反馈到滤波器输入端作为后续估计的输入。仿真结果表明，该半盲信道估计方法在平坦瑞利衰落信道下，相比于基于导频的LS信道估计方法具有更好的稳态性能。...

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Bibliographic Details
Published in电子技术应用 Vol. 39; no. 8; pp. 117 - 119
Main Author 陈国军 周游 巴斌
Format Journal Article
LanguageChinese
Published 解放军信息工程大学,河南郑州,450052 2013
Subjects
LS算法
MIMO－OFDM系统
半盲信道估计
自适应滤波器
MIMO-OFDM systems
adaptive filter
semi-blind channel estimation
LS算法
LS
自适应滤波器
半盲信道估计
MIMO-OFDM系统
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ISSN0258-7998

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Summary:无线移动通信MIMO－OFDM系统中，为了减小对导频的依赖性，针对平坦瑞利衰落信道提出了一种基于判决反馈的半盲信道估计方法。该方法使用LS算法结合导频对信道进行初始估计，然后利用初始的信道估计结果得到下一个OFDM符号对应的天线发送信号，最后利用自适应滤波稳态跟踪特性对后面的信道进行跟踪，并将恢复出的信号反馈到滤波器输入端作为后续估计的输入。仿真结果表明，该半盲信道估计方法在平坦瑞利衰落信道下，相比于基于导频的LS信道估计方法具有更好的稳态性能。
Bibliography:Aimed at the flat Rayleigh fading channel, a semi-blind channel estimation algorithm based on decision feedback was proposed to lower the dependency on pilot carrier in wireless mobile communication systems using MIMO-OFDM. The proposed algorithm initially estimated the channel state using LS algorithm with pilot carrier, then the antenna transmitting signal correspond ing to next OFDM signal was derived from the initial channel estimation. Finally, an adaptive filter with steady-state tracking char acteristics was used to trace the following channel state and the recovered signal was used as the input for next estimation. Simula tion results show that the proposed semi-blind estimation algorithm has better steady-state performance than pilot-based LS algo rithm in flat Rayleigh fading channel.
MIMO-OFDM systems; semi-blind channel estimation; LS; adaptive filter
Chen Guojun, Zhou You, Ba Bin （The PLA Information Engineering University, Zhengzhou 450002, China）
11-2305/TN
ISSN:0258-7998