| MIMO-OFDM系统中一种改进的盲信道估计算法 |
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| 引用本文： | 李国民,刘鑫,康晓非,廖桂生.MIMO-OFDM系统中一种改进的盲信道估计算法[J].应用科学学报,2016,34(3):286-292. |
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| 作者姓名： | 李国民 刘鑫 康晓非 廖桂生 |
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| 作者单位： | 1. 西安电子科技大学 雷达信号处理重点实验室, 西安 710071;
2. 西安科技大学 通信与信息工程学院, 西安 710054 |
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| 基金项目： | 国家自然科学基金(No.61231017)资助 |
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| 摘 要： | 针对MIMO-OFDM系统中线性预编码信道估计算法需要多次计算模糊度矩阵的问题,提出一种改进的盲信道估计算法.该算法首先对各天线上所接收信号的互相关矩阵进行处理,使信道估计矩阵的模糊度矩阵统一,再利用统一的模糊度矩阵通过迭代方法实现系统的信道估计.仿真结果表明,改进算法的估计精度在低信噪比时仅有较小损失,而在高信噪比时与现有的线性预编码算法接近,且具有较好的收敛性.与现有的线性预编码信道估计算法相比,改进算法显著降低了计算复杂度.
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| 关 键 词： | 多输入多输出 盲信道估计 正交频分复用 预编码 |
| 收稿时间： | 2014-07-25 |
| 修稿时间： | 2016-03-01 |
Improved Blind Channel Estimation for MIMO-OFDM Systems |
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| LI Guo-min,LIU Xin,KANG Xiao-fei,LIAO Gui-sheng.Improved Blind Channel Estimation for MIMO-OFDM Systems[J].Journal of Applied Sciences,2016,34(3):286-292. |
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| Authors: | LI Guo-min LIU Xin KANG Xiao-fei LIAO Gui-sheng |
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| Institution: | 1. Key Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China;
2. College of Communication and Information Engineering, Xi'an University of Science and Technology, Xi'an 710054, China |
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| Abstract: | Channel estimation for MIMO-OFDM systems by linear precoding requires repeated calculation of ambiguity matrices. To solve the problem, a blind channel estimation algorithm is proposed. It unifies different channel ambiguity matrices by processing crosscorrelation matrices of received signal, and then estimates the channel using an iterative method. Simulation results show that the proposed algorithm has good mean square error performance and convergence, and less computational complexity compared with existing channel estimation methods based on linear precoding. |
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| Keywords: | multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) precoding blind channel estimation |
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