Abstract
Least-squares linear functional reconstruction and extrapolation of a random field defining the random input of a linear system represented by an integral equation is considered. This problem is solved for a class of random fields with reproducing kernel Hilbert space norm equivalent to the norm of a Sobolev space of an appropriate fractional order. More specifically, functional reconstruction and extrapolation formulae are derived from generalized wavelet-based orthogonal expansions of the input and output random fields in the class considered (see Angulo and Ruiz-Medina, 1999, for the ordinary case). In the Gaussian and ordinary case, the results derived also provide sample-path functional reconstruction and extrapolation formulae. Simulation studies are carried out for systems defined in terms of fractional integration of fractional Brownian motion.
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This work has been supported in part by projects BFM2000-1465 and BFM-2002-01836 of the DGI, Spain.
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Fernández-Pascual, R., Ruiz-Medina, M.D. & Angulo, J.M. Wavelet-based functional reconstruction and extrapolation of fractional random fields. Test 13, 417–444 (2004). https://doi.org/10.1007/BF02595780
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DOI: https://doi.org/10.1007/BF02595780