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| A Method to Suppress Cross-Terms of Wigner-Ville Distribution Using ASTFT Spectrum |
| Cheng Fa-bin① Tang Bao-ping① Zhong You-ming② |
| ①(College of Mechanical Engineering, Chongqing University, Chongqing 400030, China) ②(Computer and Information College, Chongqing Jiaotong University, Chongqing 400074, China) |
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Abstract The rules of correlation between auto-terms and cross-terms of Wigner-Ville Distribution(WVD) are obtained by analyzing the WVD and a new method to suppress cross-terms of WVD using Adaptive Short-Time Fourier Transform (ASTFT) spectrum is put forward. Firstly, the signal ASTFT spectrum which can determine the signal component positions in the time-frequency plane is obtained. Then, window function, ASTFT spectrum, is selected to process the signal WVD. Thus the cross-term interference can be effectively restrained, and it retains the much finer characteristics of WVD, such as high resolution jointly in time and frequency and energy centralizing. The examples indicate that a better resolution and more effective suppression of cross-term interference is obtained in the end.
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Received: 02 April 2007
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Corresponding Authors:
Cheng Fa-bin
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2008, Vol. 30 
