Nonlinear system modeling and identification using Volterra-PARAFAC models

Gérard Favier 1 Alain Y. Kibangou 2 Thomas Bouilloc 1
1 Laboratoire d'Informatique, Signaux, et Systèmes de Sophia-Antipolis (I3S) / Equipe SIGNAL
Laboratoire I3S - SIS - Signal, Images et Systèmes
2 NECS - Networked Controlled Systems
Inria Grenoble - Rhône-Alpes, GIPSA-DA - Département Automatique
Abstract : Discrete-time Volterra models are widely used in various application areas. Their usefulness is mainly because of their ability to approximate to an arbitrary precision any fading memory nonlinear system and to their property of linearity with respect to parameters, the kernels coefficients. The main drawback of these models is their parametric complexity implying the need to estimate a huge number of parameters. Considering Volterra kernels of order higher than two as symmetric tensors, we use a parallel factor (PARAFAC) decomposition of the kernels to derive Volterra-PARAFAC models that induce a substantial parametric complexity reduction. We show that these models are equivalent to a set of Wiener models in parallel. We also show that Volterra kernel expansions onto orthonormal basis functions (OBF) can be viewed as Tucker models that we shall call Volterra-OBF-Tucker models. Finally, we propose three adaptive algorithms for identifying Volterra-PARAFAC models when input-output signals are complex-valued: the extended complex Kalman filter, the complex least mean square (CLMS) algorithm and the normalized CLMS algorithm. Some simulation results illustrate the effectiveness of the proposed identification methods.
keyword : Volterra models tensor decompositions Volterra kernels CLMS algorithm extended KAlman filter nonlinear system identification nonlinear system modeling PARAFAC Wiener models
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Article dans une revue
International Journal of Adaptive Control and Signal Processing, Wiley, 2012, 26 (1), pp.30-53. 〈10.1002/acs.1272〉
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Gérard Favier, Alain Y. Kibangou, Thomas Bouilloc. Nonlinear system modeling and identification using Volterra-PARAFAC models. International Journal of Adaptive Control and Signal Processing, Wiley, 2012, 26 (1), pp.30-53. 〈10.1002/acs.1272〉. 〈hal-00642363〉

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