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应用科学学报 ›› 2009, Vol. 27 ›› Issue (2): 131-136.

• 通信工程 • 上一篇    下一篇

正交约束PARAFAC的DS-CDMA盲接收机

刘旭 许宗泽   

  1. 南京航空航天大学信息科学与技术学院，南京210016
  • 收稿日期:2008-11-24 修回日期:2009-01-09 出版日期:2009-04-01 发布日期:2009-04-01
  • 作者简介:刘旭，博士生，研究方向：通信信号处理，E-mail: liuxu@nuaa.edu.cn；许宗泽，教授，博导，研究方向：数字通信，E-mail: xzzem@yahoo.com
  • 基金资助:
    国防预研基金(No.402040101)资助项目

Orthogonal Constrained PARAFAC Blind Receiver for DS-CDMA Systems

  1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2008-11-24 Revised:2009-01-09 Online:2009-04-01 Published:2009-04-01

PDF

1728

被引次数

14

摘要：

根据平行因子（PARAFAC）模型，研究多用户DS-CDMA系统的盲检测算法. 利用DS-CDMA系统中扩频码正交或近似正交的性质，提出了一种基于正交约束PARAFAC（OC-PARAFAC）的DS-CDMA盲接收机，给出了正交约束情况下三线性分解的克拉美–罗界的解析表达式. 实验表明正交约束三线性最小二乘(OCTALS）算法在处理DS-CDMA信号时比传统的TALS算法具有更低的克拉美–罗界. 与传统的PARAFAC接收机相比，OC-PARAFAC接收机改善了误码率性能，具有更快的收敛速度.

关键词: 盲信号处理, 平行因子分析, 三线性交替最小二乘, 直接序列码分多址, 克拉美–罗界

Abstract:

A blind detection algorithm for multi-user DS-CDMA systems is presented based on the parallel factor (PARAFAC) model. A novel orthogonal constrained PARAFAC-based blind receiver is proposed, which utilizes
orthogonality or semi-orthogonality of spreading code in DS-CDMA system. The Cramer-Rao bound (CRB) of the
orthogonal constrained trilinear decomposition is analyzed. Simulation results show that the orthogonal constrained trilinear alternating least square (OCTALS) algorithm has a lower CRB than traditional trilinear alternating least square (TALS) algorithm in processing DS-CDMA received signals. Compared with the traditional PARAFAC receiver, the OC-PARAFAC receiver has a better BER performance and faster convergence.

Key words: blind signal processing, parallel factor analysis, trilinear alternating least square, DS-CDMA, Cramer-Rao bound

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