东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (3): 337-340.DOI: -

• 论著 • 上一篇    下一篇

基于子空间跟踪的线性共轭半盲多用户检测

孟艳;汪晋宽;宋昕;韩英华;   

  1. 东北大学信息科学与工程学院;东北大学信息科学与工程学院;东北大学信息科学与工程学院;东北大学信息科学与工程学院 辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004;辽宁沈阳110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-03-15 发布日期:2013-06-24
  • 通讯作者: Meng, Y.
  • 作者简介:-
  • 基金资助:
    河北省教育厅科学研究指导计划项目(Z2004103)

Linear conjugate semi-blind multiuser detection based on subspace tracking

Meng, Yan (1); Wang, Jin-Kuan (1); Song, Xin (1); Han, Ying-Hua (1)   

  1. (1) School of Information Science and Engineering, Northeastern University, Shenyang 110004, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-03-15 Published:2013-06-24
  • Contact: Meng, Y.
  • About author:-
  • Supported by:
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摘要： 考虑实际的MC-CDMA上行链路系统,在深入研究基于子空间的MMSE半盲多用户检测算法的基础上,针对原算法引入子空间误差导致检测性能下降的问题,提出MC-CDMA系统下一种基于子空间跟踪的线性共轭MMSE半盲多用户检测算法.将子空间方法和线性共轭的思想相结合,应用新定义的信号子空间设计了基于子空间方法的线性共轭MMSE检测器,采用OPAST子空间算法实现了信号子空间的自适应跟踪.仿真结果表明,与以往的基于子空间的MMSE半盲多用户检测相比,此算法有效地提高了信干噪比,降低了系统的误比特率.

关键词: 多载波CDMA, 子空间跟踪, 半盲多用户检测, 最小均方差(MMSE), 线性共轭

Abstract: With the subspace-based minimum-mean-square-error (MMSE) semi-blind multiuser detection investigated in-depth, a linear conjugate MMSE semi-blind multiuser detector based on subspace tracking algorithm is proposed against the performance degradation induced by signal subspace estimation errors in the conventional algorithm for multicarrier CDMA (MC-CDMA) uplink. Combining the subspace method with the idea of linear conjugate, a linear conjugate MMSE detector is designed on the basis of subspace method by a newly defined signal subspace. Moreover, the orthogonal projection approximation subspace tracking (OPAST) algorithm is used for adaptive subspace estimation. Simulation results showed that the proposed algorithm can improve the signal-to-interference-plus-noise-ratio (SINR) output and reduce the bit-error-rate (BER) performance effectively, compared with previous MMSE semi-blind multiuser detection algorithms.

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