An IV-QR Algorithm for Neuro-Fuzzy Multivariable Online Identification

Authors:
G. Serra;C. Bottura
Affiliations:
Dept. of Machines, Components & Intelligent Syst., State Univ. of Campinas;-
Venue:
IEEE Transactions on Fuzzy Systems
Year:
2007

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Abstract

In this paper, a new algorithm for neuro-fuzzy identification of multivariable discrete-time nonlinear dynamic systems, more specifically applied to consequent parameters estimation of the neuro-fuzzy inference system, is proposed based on a decomposed form as a set of coupled multiple input and single output (MISO) Takagi-Sugeno (TS) neuro-fuzzy networks. An on-line scheme is formulated for modeling a nonlinear autoregressive with exogenous input (NARX) recurrent neuro-fuzzy structure from input-output samples of a multivariable nonlinear dynamic system in a noisy environment. The adaptive weighted instrumental variable (WIV) algorithm by QR factorization based on the numerically robust orthogonal Householder transformation is developed to modify the consequent parameters of the TS multivariable neuro-fuzzy network