基于小波包变换的威格纳分布交叉项的抑制

Applying wavelet packet transform to the suppression of the interference term of Wigner Ville distribution

威格纳分布是一种重要的时频分析方法,但交叉干扰问题影响了它的推广应用.基于小波包分析,利用小波包对信号的威格纳时频分布进行分解,并利用分解系数重构时频图,使交叉项得到抑制和改善,实验结果表明此方法简单有效.

The Wigner Ville distribution （WVD） is an important mean of time - frequency analysis, but the cross - term interference in WVD has a great influence on its application. On the basis of the analysis of wavelet packet, this article offers a new met.hod to time frequency analysis. This method uses wavelet packet decomposing the WVD of the signal and reconstructing the time frequency diagram according to the decomposition coefficient. It can remove cross - term efficiently. Theoretical analysis and experimental results proved the validity of the method.