| 基于DFT滤波器组实现zoom—FFT算法分析 |
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| 引用本文： | 李玉柏.基于DFT滤波器组实现zoom—FFT算法分析[J].信号处理,2000(Z1). |
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| 作者姓名： | 李玉柏 |
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| 作者单位： | 电子科技大学通信学院 |
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| 摘 要： | 本文介绍了一种基于ＤＦＴ滤波器组实现ｚｏｏｍ—ＦＦＴ算法，该算法是利用ＤＦＴ滤波器组将待分析的信号带宽分解成多个子带，经过子带选择，再进行ＦＦＴ运算。分析表明：该算法运算效率高，能实现运算量和运算精度的折衷；与Ｙｉｐ级连ｚｏｏｍ—ＦＦＴ算法比较，该算法有更大的适应性，Ｙｉｐ无修正级边ｚｏｏｍ一ＦＦＴ算法是该算法的一种特例，利用基于 ＤＦＴ滤波器组实现 ｚｐｐｍ一ＦＦＴ算法可推导出 Ｙｉｐ无修正级边 ｚｏｏｍ一ＦＦＴ算法的通用修正公式；与复调制ｚｏｏｍ一ＦＦＴ算法比较，在保证同样精度的情况下，该算法运算量为复调制ｚｏｏｍ－ＦＦＴ算法运算量的１／Ｍ（Ｍ为子带细化倍数）．
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| 关 键 词： | zoom-FFT DFT滤波器组 频率分辨率 |
The Algorithm Analysis of Zoom-FFT Implementation based on DFT Filter banks |
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| Li,Yubai.The Algorithm Analysis of Zoom-FFT Implementation based on DFT Filter banks[J].Signal Processing,2000(Z1). |
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| Authors: | Li Yubai |
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| Affiliation: | The University of electronic Science and technology |
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| Abstract: | A zoom-FFT implementation based on DFT filter banks is introduced In this algorithm the sig- nal bandwidth is decomposed into many sub-bands by DFT filter banks FFT is used to calculate the local spec- trum after sub-band selecting ,After analyzing and comparison it is clear this algorithm is effective and prac- tical to realize the trade-off between complexity and more adaptive than Yip cascaded zoom-FFT algorithm While reserve the same calculation precision,the complexity of this algorithm is only about 1/M (M is the zoom--tims)of normal complex modulation zoom-FFT |
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| Keywords: | zoom-FFT DFT Filter Frequency ResolutiH |
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