应用科学学报 ›› 2010, Vol. 28 ›› Issue (6): 561-566.doi: 10.3969/j.issn.0255-8297.2010.06.002

• 通信工程 • 上一篇    下一篇

STBC-OFDM系统自适应加权并行多用户检测

林静, 甘良才   

  1. 武汉大学电子信息学院,武汉430079
  • 收稿日期:2010-06-29 修回日期:2010-11-01 出版日期:2010-11-26 发布日期:2010-11-25
  • 作者简介:林静,博士生,研究方向:移动通信中的信道估计、多用户检测以及自适应技术,E-mail: ada0837@126.com;甘良才,教授,博导,研究方向:自适应数字通信、扩频、跳频通信、个人通信、移动通信与软件无线电,E-mail: lc_gan@hotmail.com
  • 基金资助:

    国家自然科学基金(No.61072041, No.60496310) 资助

Parallel Multi-user Detection with Adaptive Weighting for STBC-OFDM Systems

LIN Jing, GAN Liang-cai   

  1. School of Electronics and Information Science, Wuhan University, Wuhan 430079, China
  • Received:2010-06-29 Revised:2010-11-01 Online:2010-11-26 Published:2010-11-25

摘要:

针对多用户空时块码正交频分复用系统,提出了基于Turbo 码的自适应加权并行多用户检测方法. 该方法利用自适应加权多用户检测进行多用户信号分离,并将所获得的软比特信息作为Turbo 码的先验信息进行译码,将译码所得的外信息作为下次迭代中自适应加权多用户检测中权值的先验信息. 数值仿真结果表明:采用该方法的空时块码正交频分复用系统收敛较快,与自适应部分并行多用户系统、实验加权多用户系统、传统并行干扰抵消多用户系统进行比较,分别可获得1.8 dB, 2.5 dB 和3 dB 的增益.

关键词: STBC-OFDM系统, 多用户检测, 自适应加权

Abstract:

By exchanging information between Turbo decoding and multi-user detector, an iterative algorithm for adaptive weighting parallel multi-user detection is proposed. The method is applied to space time block coded orthogonal frequency division multiplexing (STBC-OFDM) systems. Multi-user signals are separated using the algorithm, and the obtained soft bit information is used as the prior information for Turbo decoding. The extrinsic information obtained in Turbo decoding is then used as a priori information for weighting coefficients in the next iteration of adaptive weighting multi-user detection. Simulation results show that the proposed method converges rapidly in space time block coded OFDM systems. Compared with adaptive partial parallel multi-user detection, trail-and-error multi-user detection, and the conventional parallel interference cancellation multi-user detection, the proposed technique offers gains of 1.8 dB, 2.5 dB and 3.0 dB respectively.

Key words:  STBC-OFDM system, multi-user detection, adaptive weighting

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