English

应用科学学报

• 通信工程 • 上一篇    下一篇

采用两级检测的MIMO OFDM空频变换方案

周霁婷1，2, 杨秀梅1，2, 熊勇1，2   

  1. 1. 中国科学院 上海微系统与信息技术研究所，上海 200050；
    2. 上海无线通信研究中心，上海 200050

  • 收稿日期:2008-04-27 修回日期:2008-06-16 出版日期:2008-09-27 发布日期:2008-09-27
  • 通信作者: 周霁婷

Space-Frequency Transformation with Two-Stage Detector in MIMO OFDM Systems

ZHOU Ji-ting1，2, YANG Xiu-mei1，2, XIONG Yong1，2

  

  1. 1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy Sciences, Shanghai 200050, China; 
    2. Shanghai Research Center for Wireless Communications (SHRCWC), Shanghai 200050, China

  • Received:2008-04-27 Revised:2008-06-16 Online:2008-09-27 Published:2008-09-27
  • Contact: ZHOU Ji-ting

被引次数

2

摘要：

提出一种能够较好抑制无线通信中多天线间干扰的空频变换方案，将方案应用于MIMO OFDM Turbo收发机中.在发射端，对每个发射天线使用预先设计好的模式进行符号映射.在接收端，利用该预先设计的发射映射模式，通过两级检测接收机的迭代过程进行检测和译码判决.其中第1级检测包括MMSE检测及干扰抑制，第2级检测包括BCJR(Bahl Cocke Jelinek Raviv)或SOMA(soft output M-algorithm)（M-算法）检测.在每次迭代中，软信息在检测器和译码器之间交换，多个数据流间的干扰被抑制.仿真结果显示，对于4发4收的多天线系统，该方案性能优于D-STTD CC.经过2次及3次迭代时，其性能优于D-STTD Turbo方案.

关键词:

多输入多输出, 正交频分复用, Turbo收发机, 两级检测

Abstract:

In this paper, a novel space-frequency transform scheme with good performance to suppress the co-antenna interference (CAI) in wireless communication is presented. The scheme is implemented in a MIMO OFDM Turbo transceiver. At the transmitter, we use a pre-designed symbol-mapping pattern for each transmitting antenna. At the receiver, according to the pre-designed transmitter structure, a two-stage detector receiver, including MMSE detection and interference subtracted step in stage one and BCJR (Bahl Cocke Jelinek Raviv) or SOMA (soft output M-algorithm) (M-algorithm) in stage two, performs two successive decisions through an iterative process. In each iteration process, soft information is exchanged between the detector and the decoder, and interference among multiple streams is subtracted. Simulation results show that the proposed scheme with BCJR achieves better performance over D-STTD CC coding. It also outperforms D-STTD Turbo coding after two and three iterations in 4×4 MIMO systems.

Key words:

MIMO, OFDM, Turbo transceiver, two-stage detector

中图分类号: