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异步DS-CDMA系统中基于线性预测的直接盲均衡

Direct Blind Equalization in Asynchronous DS-CDMA Systems Based on Linear Prediction Approach
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摘要 应用了最近提出的针对直接序列扩频码分多址 ( DS- CDMA)系统反向链路 (异步传输模式 )的线性预测方法 ,通过对接收信号进行线性变换 ,在所需用户扩频码已知的情况下 ,得到其信道列矢量子空间 ,然后在此基础上进行 MMSE均衡器和迫零均衡器的设计 ,以达到同时消除 MAI和 ICI的目的。应用直接盲均衡处理 ,能够避免信道估计可能的误差对多用户检测性能所产生的影响。仿真结果表明 ,算法的准确性和鲁棒性得到明显提高 ,并且有较好的对抗远近效应的能力。 In this paper, a linear prediction based approach is presented for blind equalization of asynchronous DS-CDMA systems operating in a multi-path environment. The recently proposed linear prediction approach is exploited firstly to estimate the column vector subspace of the channel with only the spreading code of the desired user assumed to be known. Then direct blind zero-forcing and MMSE equalizer are designed. This avoids the channel estimation error and the resulting methods are therefore more accurate, more robust and are also near-far resistant.
出处 《解放军理工大学学报(自然科学版)》 EI 2003年第3期6-10,共5页 Journal of PLA University of Science and Technology(Natural Science Edition)
基金 国家 8 63计划资助项目 ( 2 0 0 1AA12 3 0 14 ) .
关键词 DS—CDMA 线性预测 信道估计 迫零均衡 MMSE均衡 DS-CDMA linear prediction channel estimation zero-forcing equalization MMSE equalization
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参考文献4

  • 1WANG X D,POOR H V.Blind multiuser detection:a subspace approach[].IEEE Transactions on Information Theory.1998
  • 2MURAT T,XU G H.Blind multiuser channel estimation in asynchronous CDMA systems[].IEEE Transactions on Signal Processing.1997
  • 3ZHAO Q,TONG L.Adaptive blind channel estimation by least squares smoothing[].IEEE Transactions on Signal Processing.1998
  • 4FAN H,LI X.Linear prediction approach for joint blind equalization and blind multiuser detection in CDMA systems[].IEEE Transactions on Signal Processing.2000

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