非最小相位系统的高性能均衡器

doi:10.13190/jbupt.200903.65.wangjl

北京邮电大学学报 ›› 2009, Vol. 32 ›› Issue (3): 65-68.doi: 10.13190/jbupt.200903.65.wangjl

非最小相位系统的高性能均衡器

王杰令杨宏刘祖军易克初

西安电子科技大学ISN国家重点实验室西安电子科技大学

收稿日期:2008-09-02 修回日期:2009-04-13 出版日期:2009-06-28 发布日期:2009-06-28
通讯作者: 王杰令

An Equalizer Applied for Nonminimum Phase System with High Performance

Wang Jie-Ling Hong Yang Zujun Liu

Received:2008-09-02 Revised:2009-04-13 Online:2009-06-28 Published:2009-06-28
Contact: Wang Jie-Ling

摘要/Abstract

摘要：

在单位圆上存在零点的深衰落信道条件下，常规的均衡器很难有效工作，本文针对这种非最小相位系统，提出了一种新颖的合并均衡算法。将接收信号分别通过带有判决反馈结构的IIR均衡器和时间反向IIR均衡器滤波，对二者的输出结果合并之后再解调判决。由于时间正、反向判决反馈IIR均衡器对同一符号的滤波是在互不相关的背景噪声下进行，合并之后可以明显地提高信噪比，从而有效抑制单向判决反馈IIR均衡器中的误差传播现象。计算机仿真试验结果表明，针对单位圆上存在一个零点的非最小相位系统，新算法可以取得良好的性能并能超过线性滤波均衡的理想性能界。

关键词: 非最小相位, 判决反馈, IIR滤波, 误码率

Abstract:

Conventional equalizers could hardly work effectively in the severe fading channel with zeros on the unit circle. A novel combing technique is presented in this paper aiming at the equalization of such nonminimum phase channels. The received signal is equalized separately by the IIR equalizer and time-reversal (TR) IIR equalizer with decision feedback (DF) architecture, and then the output signals from the two equalizers are combined together before demodulation. Since IIR and TR-IIR equalizers deal with the same symbol under independent noise background, the signal-to-noise ratio (SNR) can be increased evidently after combining, and the error propagation effect in the DF-IIR equalizer can be effectively depressed. It is evaluated through computer simulation to verify the advantages of the new scheme which can surpass the perfect performance of filter equalization methods.

Key words: Nonminimum Phase, Decision Feedback, IIR Filter, Bit Error Rate

王杰令杨宏刘祖军易克初. 非最小相位系统的高性能均衡器[J]. 北京邮电大学学报, 2009, 32(3): 65-68.

Wang Jie-Ling Hong Yang Zujun Liu. An Equalizer Applied for Nonminimum Phase System with High Performance[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2009, 32(3): 65-68.

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非最小相位系统的高性能均衡器

An Equalizer Applied for Nonminimum Phase System with High Performance

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