| 基于DFT的信道估计插值算法改进 |
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| 引用本文： | 文汝红.基于DFT的信道估计插值算法改进[J].宜春学院学报,2012,34(4):10-12. |
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| 作者姓名： | 文汝红 |
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| 作者单位： | 宜春学院物理科学与工程技术学院,江西宜春,336000 |
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| 基金项目： | 江西省教育厅课题(JXJG-08-14-25) |
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| 摘 要： | 在采用导频的正交频分复用(OFDM)系统中,常采用离散傅里叶变换(DFT)插值的方法来实现信道估计。针对DFT算法中虚子载波的缺失而导致冲激响应有频谱泄漏的现象,对DFT算法进行了两种改进,一是采用维纳滤波插入法重建虚子载波的信道信息,二是通过优化有效导频的LS信道估计来减小噪声的影响,并提高系统的性能。通过仿真证明,改进算法明显优于传统DFT算法。
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| 关 键 词： | 离散傅里叶变换 信道估计 插值 维纳滤波 |
Optimization of DFT Interpolation |
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| WEN Ru-hong.Optimization of DFT Interpolation[J].Journal of Yichun University,2012,34(4):10-12. |
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| Authors: | WEN Ru-hong |
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| Institution: | WEN Ru-hong(Physics Science and Technology College,Yichun University,Yichun 336000,China) |
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| Abstract: | The DFT interpolation is an usual channel estimation for OFDM systems.On the basis of DFT,two algorithms was proposed for interpolation.One is based on Wiener filter through rebuilding channel information of virtual carriers;the other is based on optimizing Least-Square(LS) channel estimation.As compared with the DFT interpolation,the simulations showed that the proposed interpolator has better performance of MSE and it provides a performance similar to the MMSE channel estimation with significantly much lower computational complexity. |
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| Keywords: | DFT channel estimation interpolation wiener filter |
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