Cross-Term Suppression in Time Order Distribution for AWGN Signal

Waqas Mahmood; Nabeel Ali Khan; Noor Muhammad Memon; Fayyaz Ahmed Chaudhry

doi:10.22581/muet1982.1702.08

Waqas Mahmood University of Engineering and Technology, Taxila.
Nabeel Ali Khan Foundation University, Islamabad.
Noor Muhammad Memon Quaid-e-Awam University of Engineering & Technology, Nawabshah
Fayyaz Ahmed Chaudhry COMSATS Institute of Information & Technology, Wah Campus

DOI: https://doi.org/10.22581/muet1982.1702.08

Keywords: Short Time Fourier Transform, Wigner Distribution, Time Frequency, Fractional Fourier Transform.

Abstract

A technique of cross-term suppression in WD (Wigner Distribution) for a multi-component signal that is embedded WGN (White Gaussian Noise) is proposed. In this technique, an optimized algorithm is developed for time-varying noisy signal and a CAD (Computer Aided Design) simulator is designed for Numerical simulations of synthetic signal. In proposed technique, signal components are localized in tf (time frequency) plane by STFT (Short Time Fourier Transform). Rectified STFT is computed and Spectral Kurtosis is used to separate a signal components from noise in t-f plane. The t-f plane is segmented and then signal components are filtered out by FFT (Fractional Fourier Transform). Finally, WD (free of cross terms) of isolated signal component is computed to obtain high resolution in t-f plane.