
Estimation of some nonlinear ARX (NARX) models is studied. First the model structures are discussed and their numerical tractability examined. Three NARX models axe proposed. Parameter estimation is solved for the three models. A relaxation iteration scheme is proposed by using the model structures in which the error is bilinear-in-parameters. The convergence and consistency of the method are established. Simulation study will be used to illustrate the method.
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