Multi-Resolution Hilbert Approach to Multidimensional Gauss-Markov Processes

Thibaud Taillefumier 1 Jonathan Touboul 2
2 NEUROMATHCOMP
CRISAM - Inria Sophia Antipolis - Méditerranée , INRIA Rocquencourt, ENS Paris - École normale supérieure - Paris, UNS - Université Nice Sophia Antipolis, CNRS - Centre National de la Recherche Scientifique : UMR8548
Abstract : The study of multidimensional stochastic processes involves complex computations in intricate functional spaces. In particular, the diffusion processes, which include the practically important Gauss-Markov processes, are ordinarily defined through the theory of stochastic integration. Here, inspired by the L\'{e}vy-Cieselski construction of the Wiener process, we propose an alternative representation of multidimensional Gauss-Markov processes as expansions on well-chosen Schauder bases, with independent random coefficients of normal law with zero mean and unitary variance. We thereby offer a natural multi-resolution description of Gauss-Markov processes as limits of the finite-dimensional partial sums of the expansion, that are strongly almost-surely convergent. Moreover, such finite-dimensional random processes constitute an optimal approximation of the process, in the sense of minimizing the associated Dirichlet energy under interpolating constraints. This approach allows simpler treatment in many applied and theoretical fields and we provide a short overview of applications we are currently developing.
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Submitted on : Thursday, July 18, 2013 - 4:00:02 PM
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Thibaud Taillefumier, Jonathan Touboul. Multi-Resolution Hilbert Approach to Multidimensional Gauss-Markov Processes. International Journal of Stochastic Analysis, Hindawi, 2011, ⟨10.1155/2011/247329⟩. ⟨hal-00846144⟩

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