A LEARNING THEORY APPROACH TO SYSTEM IDENTIFICATION
M. Vidyasagar1 Rajeeva L. Karandikar2
1 Advanced Technology Centre, Tata Consultancy Services Khan Lateefkhan Estate, Fateh Maidan Road, Hyderabad 500 001, INDIA sagar@atc.tcs.co.in
2 Indian Statistical Institute, S.J.S. Sansawal Marg, New Delhi 110 016, INDIA rlk@isid.ac.in

In this paper, we present a new approach to system identification and stochastic adaptive control, by viewing these as problems in statistical learning theory. The main motivation for initiating such a program is that traditional stochastic identification methods provide asymptotic results, whereas statistical learning theory provides finite-time results. If system identification is to be combined with robust control theory to provide a sound mathematical basis for indirect adaptive control, it is essential to have finite-time estimates of the sort provided by statistical learning theory. As an illustration of this approach, a result is derived showing that in the case of input-output stable systems with fading memory, it is possible to adapt some standard arguments from statistical learning theory to provide finite-time estimates of the rate of convergence of the identified model to the true system.
Keywords: Identification, learning algorithms, stochastic control
Session slot T-Mo-A02: A learning approach to identification and control/Area code 3a : Modelling, Identification and Signal Processing

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