加窗离散傅里叶变换性能分析和比对  

Performance analysis and comparison of windowed discrete Fourier transform

作　　者：汪伟[1] 谢皓臣[1] 梁光明[1] 刘东华[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《现代电子技术》2012年第3期115-118,共4页Modern Electronics Technique

摘　　要：离散傅里叶变换(DFT)是数字信号处理的常用方法,但通过加窗对信号进行时域截短会使频谱分析出现误差。不同窗函数对信号频谱产生的影响不同,对5种常用窗函数的特性进行了比较和适用性分析,通过仿真实验证明了针对不同信号特点和处理要求,应选择合适的窗函数,以减小频谱泄漏和栅栏效应对信号分析的影响。The common method for digital signal processing is discrete Fourier transform （DFT）. However, there is a certain error for spectrum analysis due to truncation of time field signal by window function. There are different effects for signal spectrum with different window functions. Comparison and suitability analysis for the characteristics of five common window functions are provided. Appropriate window function should be chosen based on the feature of signal and requirement of processing and goals to reduce the influence of spectrum leakage and fence effect to signal analysis. The conclusion is proved by simulation results.

关 键 词：数字信号处理 离散傅里叶变换 窗函数 频谱泄露 栅栏效应 频谱分析 

分 类 号：TN911-34[电子电信—通信与信息系统]