Bayesian Volterra system identification using reversible jump MCMC algorithm

Oktay Karakus, Ercan E. Kuruoglu, Mustafa A. Altinkaya

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

Volterra systems have had significant success in modelling nonlinear systems in various real-world applications. However, it is generally assumed that the nonlinearity degree of the system is known beforehand. In this paper, we contribute to the literature on Volterra system identification (VSI) with a numerical Bayesian approach which identifies model coefficients and the nonlinearity degree concurrently. Although this numerical Bayesian method, namely reversible jump Markov chain Monte Carlo (RJMCMC) algorithm has been used with success in various model selection problems, our use is in a novel context in the sense that both memory size and nonlinearity degree are estimated. The aforementioned study ensures an anomalous approach to RJMCMC and provides a new understanding on its flexible use which enables trans-structural transitions between different classes of models in addition to transdimensional transitions for which it is classically used. We study the performance of the method on synthetically generated data including OFDM communications over a nonlinear channel.
Original languageEnglish
Pages (from-to)125-136
Number of pages12
JournalSignal Processing
Volume141
Early online date31 May 2017
DOIs
Publication statusPublished - 1 Dec 2017

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