Document Details

Document Type : Article In Journal 
Document Title :
Evolutionary Spectrum and Bispectrum Estimation of a Nonstationary Process
تقدرير الطيف التطوري والطيف الثنائي لإشارة غير مستقرة
 
Subject : Electrical and Computer Engineering 
Document Language : English 
Abstract : The modeling of a non-stationary process is a problem of great interest and has many applications in diverse fields in signal processing. In this paper, an algorithm for estimating the shiftvariant (SV) parameters of a non-stationary process, using orthogonal projection, is proposed. These parameters can be used for estimating the evolutionary spectrum (ES), a time-frequency distribution, of a non-stationary process. The ES is then estimated with an order based on the dimensionality of the expanding orthogonal polynomials (OPs). In the proposed method the process is decomposed to its basic elements by projecting it, recursively, onto elementary OPs. Simulations are presented when the process has either single or multiple SV parameters. We have also shown that if the output of the SV system is corrupted by stationary/nonstationary noise with symmetric distribution, the noise can be removed using the evolutionary bispectrum (EB), and simulation is given to show the powerful of the EB. 
ISSN : 1319-1047 
Journal Name : Engineering Sciences Journal 
Volume : 17 
Issue Number : 1 
Publishing Year : 1427 AH
2006 AD 
Number Of Pages : 20 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبدالله إبراهيم الشوشانAbdullah I. Al-ShoshanResearcher  

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