| 应用拓展时域信号法抑制DFT频谱泄漏 |
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| 引用本文： | 张晓光,王艳芬,王刚,刘卫东.应用拓展时域信号法抑制DFT频谱泄漏[J].实验科学与技术,2012,10(5):18-20. |
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| 作者姓名： | 张晓光 王艳芬 王刚 刘卫东 |
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| 作者单位： | 中国矿业大学信息与电气工程学院,江苏徐州,221116 |
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| 基金项目： | 2011年江苏省高校教改课题资助（2011JSJG273）; 2010年中国矿业大学青年教改课题资助（201021） |
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| 摘 要： | 该文直观地分析了DFT频谱泄漏产生的机理,指出采样频率与信号频率的比值为无理数时频谱泄漏不可避免,只能尽量减少。同时提出一种拓展时域信号的DFT频谱泄漏抑制方法,Matlab仿真结果表明:与海宁窗加权的DFT比较,该方法抑制频谱泄漏的效果较好。
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| 关 键 词： | 离散傅里叶变换 频谱泄漏 时域信号拓展 仿真 |
DFT Spectral Leakage Suppression Based on Signal Extension in Time Domain |
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| ZHANG Xiao-guang,WANG Yan-fen,WANG Gang,LIU Wei-dong.DFT Spectral Leakage Suppression Based on Signal Extension in Time Domain[J].Experiment Science & Technology,2012,10(5):18-20. |
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| Authors: | ZHANG Xiao-guang WANG Yan-fen WANG Gang LIU Wei-dong |
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| Institution: | (School of Information and Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,China) |
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| Abstract: | The producing mechanism of DFT spectral leakage is analyzed intuitively in this paper.The conclusion that the spectral leakage is inevitable and can only be reduced as much as possible when the sampling frequency and signal frequency ratio is irrational.Also symmetric expansion of signal in time-domain is proposed for reducing the DFT spectrum leakage,Matlab simulation results show that this method is better against spectral leakage compared with the weighted DFT Haining window. |
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| Keywords: | DFT spectral leakage symmetric extension simulation |
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