Functions in Sampling Spaces

Details Functions in Sampling Spaces Functions in Sampling Spaces

2005-05-09

arxiv.org/abs/math/0505147v2

Mathematics

Classical Analysis and ODEs

20 pages, to appear in "The Journal of Sampling Theory in Signal and Image Processing", typos corrected

Scientific paper

Sampling theory in spaces other than the space of band-limited functions has recently received considerable attention. This is in part because the band-limitedness assumption is not very realistic in many applications. In addition, band-limited functions have very slow decay which translates in poor reconstruction. In this article we study the sampling problem in general shift invariant spaces. We characterize the functions in these spaces and provide necessary and sufficient conditions for a function in $L^2(\R)$ to belong to a sampling space. Furthermore we obtain decompositions of a sampling space in sampling subspaces. These decompositions are related with determining sets. Some examples are provided.

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