| 基于训练序列的发射分集OFDM系统的子空间跟踪信道估计 |
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| 引用本文： | 徐信,蔡跃明,徐友云.基于训练序列的发射分集OFDM系统的子空间跟踪信道估计[J].应用科学学报,2004,22(4):453-458. |
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| 作者姓名： | 徐信 蔡跃明 徐友云 |
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| 作者单位： | 1. 解放军理工大学,通信工程学院,江苏,南京,210007;济南军区,通信网络技术管理中心,山东,济南,250002
2. 解放军理工大学,通信工程学院,江苏,南京,210007 |
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| 基金项目： | 国家863计划(2003AA12331007)，江苏省自然科学基金(BK2003015)资助项目 |
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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．
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| 关 键 词： | 信道估计 OFDM系统 发射分集 子空间跟踪 训练序列 冲激响应 空时分组编码 系统性能 时延 仿真 |
| 文章编号： | 0255-8297(2004)04-0453-06 |
Subspace-Tracking Channel Estimation for Training-Sequence-Based OFDM Systems with Transmitter Diversity |
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| XU Xin.Subspace-Tracking Channel Estimation for Training-Sequence-Based OFDM Systems with Transmitter Diversity[J].Journal of Applied Sciences,2004,22(4):453-458. |
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| Authors: | XU Xin |
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| 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. |
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| Keywords: | OFDM training sequence channel estimation subspace tracking |
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