Frames and Oversampling Formulas for Band Limited Functions

Details Frames and Oversampling Formulas for Band Limited Functions Frames and Oversampling Formulas for Band Limited Functions

2008-08-10

arxiv.org/abs/0808.1412v2

Mathematics

Functional Analysis

28 pages, 9 figures; corrected typos

Scientific paper

In this article we obtain families of frames for the space B_\omega of functions with band in [-\omega,\omega] by using the theory of shift-invariant spaces. Our results are based on the Gramian analysis of A. Ron and Z. Shen and a variant, due to Bownik, of their characterization of families of functions whose shifts form frames or Riesz bases. We give necessary and sufficient conditions for the translates of a finite number of functions (generators) to be a frame or a Riesz basis for B_\omega. We also give explicit formulas for the dual generators and we apply them to Hilbert transform sampling and derivative sampling. Finally, we provide numerical experiments which support the theory.

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