| 一种有效的MIMO-OFDM系统时变信道估计算法 |
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| 引用本文： | 张宇,张乃通.一种有效的MIMO-OFDM系统时变信道估计算法[J].哈尔滨工业大学学报,2009,41(3):18-21. |
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| 作者姓名： | 张宇 张乃通 |
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| 作者单位： | 哈尔滨工业大学,电子与信息技术研究院,哈尔滨,150001
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金 |
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| 摘 要： | 为了在快速时变环境下减小多普勒效应对系统性能的影响,提出了一种适用于快速时变环境下M I-MO-OFDM系统的两步信道估计方法.第1步运用最小二乘算法及内插算法对非导频处传输的数据进行初始估计;第2步运用第1步得到的数据估计值结合提出的降低信道估计矩阵维数的方法,从而获得精确的信道参数.仿真结果表明,与其简化估计算法和最小二乘(Least Square)估计算法相比,提出的方法有效的降低了信道估计的误码率及最小均方误差,并且具有较低的复杂度,可很好地满足快速时变信道环境的要求.
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| 关 键 词： | 快速时变信道 多数入多数出-正交频分复用 信道估计 |
An efficient channel estimation method for MIMO-OFDM systems |
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| ZHANG Yu,ZHANG Naitong.An efficient channel estimation method for MIMO-OFDM systems[J].Journal of Harbin Institute of Technology,2009,41(3):18-21. |
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| Authors: | ZHANG Yu ZHANG Naitong |
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| Affiliation: | (School of Electronics and Information Technology,Harbin Institute of Technology,Harbin 150001,China) |
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| Abstract: | In order to decrease the influence of Doppler frequency on the performance of MIMO-OFDM channel estimation,a two-step channel estimation method is proposed in this paper.The least square(LS) algorithm and channel interpolation were used to estimate the channel at data subcarriers data symbols in the first step and these values were used to obtain final channel values by the proposed channel estimation scheme in the second step.Simulation results show that the performance of the two-step channel estimation method greatly outperforms that of the LS channel estimation algorithm and the simplified scheme.In addition,this algorithm largely decreases the computational complexity and adapts to fast time-varying channels. |
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| Keywords: | fast time-varying channel MIMO-OFDM channel estimation |
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