| 引用本文: | 石峰,胡登鹏,王晨,等.OFDM系统中基于补零DFT信道插值算法的研究.[J].国防科技大学学报,2010,32(5):98-104.[点击复制] |
| SHI Feng,HU Dengpeng,WANG Chen,et al.A Study of Channel Interpolation for OFDM Systems Based on Zero-padding DFT[J].Journal of National University of Defense Technology,2010,32(5):98-104[点击复制] |
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| OFDM系统中基于补零DFT信道插值算法的研究 |
| 石峰1,2, 胡登鹏1, 王晨2, 张尔扬1 |
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(1.国防科技大学 电子科学与工程学院，湖南 长沙 410073;2.空军工程大学 工程学院，陕西 西安 710038)
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| 摘要: |
| 针对OFDM系统中基于补零DFT实现信道插值的算法，对传统的时域方法和变换域方法进行了分析，并提出了一种新的补零方法。首先通过理论分析指出传统的基于补零DFT实现信道插值算法中，时域方法和变换域方法是等效的；通过对信道插值算法中冲激响应估计序列进行补零的分析，指出补零操作是为了重构出冲激响应的N点采样序列(N表示总子载波数)，并针对传统补零方法在一定条件下产生的重构误差，提出了一种新的补零方法。仿真结果表明以上理论分析是正确的，新补零方法可以减小一定条件下的重构误差，增强信道插值算法对信道延迟分布的鲁棒性，有效提高系统的性能。 |
| 关键词: 信道估计 DFT 插值 OFDM 补零 |
| DOI： |
| 投稿日期：2010-04-16 |
| 基金项目: |
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| A Study of Channel Interpolation for OFDM Systems Based on Zero-padding DFT |
| SHI Feng1,2, HU Dengpeng1, WANG Chen2, ZHANG Eryang1 |
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(1.College of Electronic Science and Engineering, National Univ. of Defense Technology, Changsha 410073, China;2.Engineering Institute, Air Force Engineering University, Xi'an 710038, China)
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| Abstract: |
| Channel interpolation methods based on zero-padding DFT for OFDM systems were investigated. Two conventional interpolation schemes for channel estimation were analyzed. Analysis shows that the two methods are equivalent, and zero padding can be used to reconstruct the channel impulse response samples of length N, where N is the number of total subcarriers. The reconstruction error of conventional zero-padding methods was discussed, and a new zero-padding method was proposed. Simulation results show that the above analysis is correct, and the reconstruction error of channel impulse response is decreased by the proposed method in some channel conditions. Furthermore, the channel interpolation with the proposed zero-padding method is robust to the distribution of path delay, and the performance of system is enhanced. |
| Keywords: channel estimation DFT(Discrete Fourier Transform) OFDM(Orthogonal Frequency Division Multiplexing) interpolation zero padding |
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