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A new form of Gabor Wigner Transform by adaptive thresholding in Gabor Transform and Wigner Distribution and the power of signal synthesis techniques to enhance the strengths of GWT

Ajab M., Taj I. A., Shafi I., Stankovic S.

Metrology and Measurement Systems

2013

Vol. 20, nr 1

99-106

In this paper, a modified form of the Gabor Wigner Transform (GWT) has been proposed. It is based on adaptive thresholding in the Gabor Transform (GT) and Wigner Distribution (WD). The modified GWT combines the advantages of both GT and WD and proves itself as a powerful tool for analyzing multi-component signals. Performance analyses of the proposed distribution are tested on the examples, show high resolution and crossterms suppression. To exploit the strengths of GWT, the signal synthesis technique is used to extract amplitude varying auto-components of a multi-component signal. The proposed technique improves the readability of GWT and proves advantages of combined effects of these signal processing techniques.

Comparative analysis of variants of Gabor-Wigner Transform for crossterm reduction

Ajab M., Taj I. A., Khan N. A.

Metrology and Measurement Systems

2012

Vol. 19, nr 3

499-508

Gabor Wigner Transform (GWT) is a composition of two time-frequency planes (Gabor Transform (GT) and Wigner Distribution (WD)), and hence GWT takes the advantages of both transforms (high resolution of WD and cross-terms free GT). In multi-component signal analysis where GWT fails to extract auto-components, the marriage of signal processing and image processing techniques proved their potential to extract autocomponents. The proposed algorithm maintained the resolution of auto-components. This work also shows that the Fractional Fourier Transform (FRFT) domain is a powerful tool for signal analysis. Performance analysis of modified fractional GWT reveals that it provides a solution of cross-terms of WD and blurring of GT.