应用拓展时域信号法抑制DFT频谱泄漏

DFT Spectral Leakage Suppression Based on Signal Extension in Time Domain

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。

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.