| MIMO-OFDM系统基于DFT的LS信道估计算法 |
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| 引用本文： | 沈丰,王辉.MIMO-OFDM系统基于DFT的LS信道估计算法[J].通信技术,2011(9):13-14,17. |
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| 作者姓名： | 沈丰 王辉 |
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| 作者单位： | 南京工业大学电子与信息工程学院; |
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| 摘 要： | 精确的信道估计是提高多输入多输出正交频分复用（MIMO-OFDM,Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing）系统性能的关键,针对现有的信道估计算法的不足,提出了一种基于DFT的最小二乘（LS,Least Square）信道估计算法,利用噪声方差设定一个门限进行阈值,进一步消除噪声干扰,充分利用了时变无线信道中时域和频域的相关性,改善了信道估计的性能。为验证其有效性进行了仿真。仿真结果表明,在慢时变信道环境下,改进方法可以进一步提高信道估计的精度,同时保持了较低的复杂度。
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| 关 键 词： | 多输入多输出 正交频分复用 信道估计 离散傅里叶变换 |
DFT-based LS Channel Estimation Algorithm for MIMO-OFDM Systems |
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| SHEN Feng,WANG Hui.DFT-based LS Channel Estimation Algorithm for MIMO-OFDM Systems[J].Communications Technology,2011(9):13-14,17. |
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| Authors: | SHEN Feng WANG Hui |
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| Affiliation: | SHEN Feng,WANG Hui(College of Electronics and Information Engineering,Nanjing University of Technology,Nanjing Jiangsu 211816,China) |
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| Abstract: | Accurate channel estimation in multiple input multiple output orthogonal frequency division multiplexing(MIMO-OFDM)systems is the key to improvement of the system performance.For deficiency of the existing channel estimation algorithms,a DFT-based LS channel estimation algorithm is proposed,which with the estimation of the noise power variance,could achieve a threshold and thus remove the noise further.This algorithm by taking full advantage of correlation between time domain and frequency domain in time va... |
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| Keywords: | MIMO OFDM channel estimation DFT |
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