Mehran University Research Journal Of Engineering &
Technology (HEC Recognized In Category "X")
Publishing Since 1982.



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Comparative Analysis of Low Amplitude Multi-Component Time -Varying Signal

Keywords: Time Frequency Representation, Linear Time Frequency Representation, Quadratic Time Frequency Representation, Gabor Wigner Transform, Wigner Distribution

Mehran University Research Journal of Engineering & Technology

Volume 29 ,  Issue 4

WAQAS   MEHMOOD,FAYYAZ AHMED  CHAUDHRY,AHMED KHALIL  KHAN

Abstract

Non stationary signals deals with linear and quadratic time frequency representation. For multicomponent signal, quadratic time frequency representation gives high readability and ideal energy concentration in t-f plan but they suffer from cross-terms due to its quadratic nature. Similarly, a linear time frequency representation gives free cross-terms but offers low readability in t-f plane. Based on these facts it is necessary to combine linear and quadratic time frequency representation which gives high readability and free cross-terms in t-f plane. A combination of linear and quadratic t-f representation is used for the analysis of low amplitude multi-component signal in t-f plane. This paper presents a comparison of some most widely used t-f representation based on performance measure. As a result of thorough comparisons, the reason behind combining linear and quadratic t-f representation to obtained a new t-f representation, which reduce cross-terms and offers high readability in t-f plane