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MIMO-OFDM系统中的最优化训练序列设计

刘刚;郭漪;葛建华
  

  1. (西安电子科技大学 综合业务网理论及关键技术国家重点实验室,陕西 西安 710071)
  • 收稿日期:2007-11-09 修回日期:1900-01-01 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 刘刚

Optimal training design for MIMO-OFDM systems

LIU Gang;GUO Yi;GE Jian-hua
  

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi’an 710071, China)
  • Received:2007-11-09 Revised:1900-01-01 Online:2008-12-20 Published:2008-12-20
  • Contact: LIU Gang

摘要: 推导了MIMO-OFDM信道估计MSE最小准则下训练序列的最优化条件和最优化结构,提出了一种最优化训练序列.这一序列结合了CDM,FDM与TDM训练结构,保证了不同发射天线的导频符号在空、时、频三维空间上相互正交,从而有效地消除了天线间的信号干扰,降低了信道估计的复杂度.同时,它的导频结构灵活,可以根据信道环境、系统参数以及系统性能要求进行适当选取,因而具有广泛的适用性.

关键词: 多输入多输出-正交频分复用, 训练序列, 时分复用, 频分复用, 码分复用

Abstract: The problem of optimal training design for channel estimation in MIMO-OFDM systems is investigated. The optimality condition and training structure based on minimizing the channel estimation MSE is analyzed, and a new training sequence is presented. This sequence combines the optimal structures of frequency division multiplexing, time division multiplexing and code division multiplexing, and retains the orthogonality in the time domain, frequency domain and space domain, thus decreasing the effect of the multiple antennas interference and reducing the channel estimation complexity effectively. With a flexible structure, it can be transformed according to channel environment, system parameters, system performance, etc.

Key words: MIMO-OFDM, training sequence, time division multiplexing, frequency division multiplexing, code division multiplexing

中图分类号: 

  • TN929.5