| Turbo编码MIMO-OFDM系统中的EM迭代信道估计 |
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| 引用本文： | 乔晓强,蔡跃明,徐信,徐友云.Turbo编码MIMO-OFDM系统中的EM迭代信道估计[J].电子与信息学报,2006,28(1):143-146. |
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| 作者姓名： | 乔晓强 蔡跃明 徐信 徐友云 |
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| 作者单位： | 解放军理工大学通信工程学院,南京,210007;解放军理工大学通信工程学院,南京,210007;解放军理工大学通信工程学院,南京,210007;解放军理工大学通信工程学院,南京,210007 |
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| 摘 要： | 该文对频率选择性衰落信道条件下的Turbo编码多入多出正交频分复用(MIMO-OFDM)系统的信道估计进行了研究，提出了一种将Turbo迭代译码与EM迭代信道估计相结合的方法。采用该方法的EM迭代信道估计性能得到了明显提高，且适合于非常恶劣的信道环境。另外，通过仿真可知，利用EM迭代信道估计算法的系统性能优于利用简化的最小二乘(LS)信道估计算法所获得的系统性能。
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| 关 键 词： | MIMO-OFDM Turbo迭代译码 EM迭代信道估计 最小二乘信道估计 |
| 文章编号： | 1009-5896（2006）01-0143-04 |
| 收稿时间： | 2004-07-07 |
| 修稿时间： | 2004-11-25 |
EM Iterative Channel Estimation for Turbo Coded MIMO-OFDM Systems |
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| Qiao Xiao-qiang,Cai Yue-ming,Xu Xin,Xu You-yun.EM Iterative Channel Estimation for Turbo Coded MIMO-OFDM Systems[J].Journal of Electronics & Information Technology,2006,28(1):143-146. |
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| Authors: | Qiao Xiao-qiang Cai Yue-ming Xu Xin Xu You-yun |
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| Affiliation: | Institute of Communication Engineering,PLA Univ. of Sci. &Tech., Nanjing 210007, China |
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| Abstract: | The channel estimation for Turbo coded Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems in frequency selective fading channels is studied. A method combining Turbo codes and iterative decoding with Expectation-Maximization (EM)-type iterative channel estimation algorithms is presented, which can improve the system performance greatly. The algorithms can also be applied to the very bad channel environments. Furthermore, from the simulation, the system performance with EM-type iterative channel estimation algorithms outperforms that with simplified LS channel estimation algorithms. |
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| Keywords: | MIMO-OFDM |
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