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应用科学学报 ›› 2004, Vol. 22 ›› Issue (4): 453-458.

• 论文 • 上一篇    下一篇

基于训练序列的发射分集OFDM系统的子空间跟踪信道估计

徐信1,2, 蔡跃明1, 徐友云1   

  1. 1 解放军理工大学通信工程学院 江苏南京 210007;
    2 济南军区通信网络技术管理中心 山东济南 250002
  • 收稿日期:2003-07-13 修回日期:2003-11-10 出版日期:2004-12-31 发布日期:2004-12-31
  • 作者简介:徐信(1970-),男,河北新乐人,工程师;硕士生;蔡跃明(1961-),男,福建永泰人,教授,博导.
  • 基金资助:
    国家863计划(2003AA12331007);江苏省自然科学基金(BK2003015)资助项目

Subspace-Tracking Channel Estimation for Training-Sequence-Based OFDM Systems with Transmitter Diversity

XU Xin1,2, CAI Yue-ming1, XU You-yun1   

  1. 1. Institute of Communications Engineering, PLAUST, Nanjing 210007, China;
    2. Network Technology Management Center of Communications, Jinan Military Area, Jinan 250002, China
  • Received:2003-07-13 Revised:2003-11-10 Online:2004-12-31 Published:2004-12-31

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摘要： 针对基于训练序列的发射分集OFDM系统提出了两种信道响应的时延子空间和幅度跟踪信道估计方法:第一种方法直接对信道的时域冲激响应进行跟踪;第二种方法对信道时域冲激响应的离散傅里叶变换(DFT)进行跟踪,进一步提高了信道估计性能.结合维纳内插滤波技术对两发一收空时分组编码的发射分集OFDM系统进行了仿真,通过对信道估计结果进行子空间跟踪,显著提高了系统性能.

关键词: 信道估计, 子空间跟踪, 正交频分复用, 训练序列

Abstract: In training-sequence-based OFDM systems, a training sequence is inserted in the specific location of each slot in order to estimate the channel impulse response in the time-domain and carry out equalization in the frequency-domain. In this paper, we propose two training-sequence-based channel estimation approaches for OFDM systems with transmitter diversity by tracking the delay-subspace and the amplitudes of the CIR or its DFT. Combined with Wiener interpolation filtering technique simulations of an OFDM system with two-transmit-antennas-and-one-receive-antenna space-time block coding show the advantages of the approaches.

Key words: OFDM, training sequence, subspace tracking, channel estimation

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