Stochastic Approximation and Its Applications

Stochastic Approximation and Its Applications (Nonconvex Optimization and Its Applications, 64) 2002nd Edition
by Han-Fu Chen (Author)
Publisher: Springer; 2002nd edition (August 31, 2002)
Language: English
Hardcover: 375 pages
ISBN-10: 1402008066
ISBN-13: 9781402008061
Estimating unknown parameters based on observation data conta- ing information about the parameters is ubiquitous in diverse areas of both theory and application. For example, in system identification the unknown system coefficients are estimated on the basis of input-output data of the control system; in adaptive control systems the adaptive control gain should be defined based on observation data in such a way that the gain asymptotically tends to the optimal one; in blind ch- nel identification the channel coefficients are estimated using the output data obtained at the receiver; in signal processing the optimal weighting matrix is estimated on the basis of observations; in pattern classifi- tion the parameters specifying the partition hyperplane are searched by learning, and more examples may be added to this list. All these parameter estimation problems can be transformed to a root-seeking problem for an unknown function. To see this, let - note the observation at time i. e. , the information available about the unknown parameters at time It can be assumed that the parameter under estimation denoted by is a root of some unknown function This is not a restriction, because, for example, may serve as such a function.

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