Parametric adaptive time-frequency representation based on time-sheared Gabor atoms
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- 作者：Shiwei Ma ; Xiaojin Zhu ; Guanghua Chen ; Jian Wang ; Jialin Cao
- 关键词：Time-frequency analysis ; Gabor atom ; Time-shear ; Adaptive signal decomposition ; Time-frequency distribution
- 刊名：Journal of Systems Engineering and Electronics
- 出版年：2007
- 出版时间：March 2007
- 年：2007
- 卷：18
- 期：1
- 页码：1-7
- 全文大小：585 K
文摘
A localized parametric time-sheared Gabor atom is derived by convolving a linear frequency modulated factor, modulating in frequency and translating in time to a dilated Gaussian function, which is the generalization of Gabor atom and is more delicate for matching most of the signals encountered in practice, especially for those having frequency dispersion characteristics. The time-frequency distribution of this atom concentrates in its time center and frequency center along energy curve, with the curve being oblique to a certain extent along the time axis. A novel parametric adaptive time-frequency distribution based on a set of the derived atoms is then proposed using a adaptive signal subspace decomposition method in frequency domain, which is non-negative time-frequency energy distribution and free of cross-term interference for multicomponent signals. The results of numerical simulation manifest the effectiveness of the approach in time-frequency representation and signal de-noising processing.