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采用比特干扰抵消的低复杂度多用户空时迭代接收机

杜 娜 徐大专
  

  1. 南京航空航天大学 信息科学与技术学院, 江苏 南京 210016
  • 收稿日期:2007-09-17 修回日期:2008-02-26 出版日期:2008-05-31 发布日期:2008-05-31

Low Complexity Iterative Receiver with Bit-Level Cancellation and Detection for Multiuser Space-Time Coding Systems

DU Na, XU Da-zhuan   

  1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  • Received:2007-09-17 Revised:2008-02-26 Online:2008-05-31 Published:2008-05-31

被引次数

1

摘要： 提出一种联合Turbo-BLAST的多用户空时编码方案。在接收端，传统的多用户接收机一般都采用基于符号干扰抵消(signal-level cancellation，SLC )的方案，复杂度较高。该文提出一种基于比特级干扰抵消(bit-level cancellation BLC )的低复杂度迭代接收机方案。该方案在检测部分将M-QAM调制符号分解成一系列BPSK符号的线性组合，采用比特级的干扰抵消。理论分析和仿真结果表明，新所提出的方案将迭代接收机检测模块的软检测和软解调部分简化为一个单一的检测部分, 很大程度上降低了计算复杂度。同时在发送端采用贝尔实验室的BLAST分层空时结构，有效的提高了频谱效率。

关键词: 空时编码, Turbo-BLAST, 迭代接收机, 软干扰抵消, 比特级干扰抵消

Abstract: A multiuser space-time coding system combined with the Turbo-BLAST scheme is presented. Since the conventional iterative receiver with symbol-level cancellation (SLC) has high computation complexity, a low complexity iterative receiver scheme with bit-level cancellation (BLC) and detection is proposed which can perform bit-level cancellation by decomposing an M-QAM constellation into a linear combination of binary constellations. Theoretical analysis and simulation results show that the proposed scheme has lower complexity compared with the conventional receiver without introducing performance degradation, while the spectral efficiency is improved due to the BLAST structure used at the transmitter.

Key words:

space-time coding, Turbo-BLAST, iterative receiver, soft interference cancellation, bit-level cancellation