Rotated time-frequency lattices are sets of stable sampling for continuous wavelet systems
Abstract
We provide an example for the generating matrix $A$ of a two-dimensional lattice $\Gamma = A\mathbb{Z}^2$, such that the following holds: For any sufficiently smooth and localized mother wavelet $\psi$, there is a constant $\beta(A,\psi)>0$, such that $\beta\Gamma\cap (\mathbb{R}\times\mathbb{R}^+)$ is a set of stable sampling for the wavelet system generated by $\psi$, for all $0<\beta\leq \beta(A,\psi)$. The result and choice of the generating matrix are loosely inspired by the studies of low discrepancy sequences and uniform distribution modulo $1$. In particular, we estimate the number of lattice points contained in any axis parallel rectangle of fixed area. This estimate is combined with a recent sampling result for continuous wavelet systems, obtained via the oscillation method of general coorbit theory.
- Publication:
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arXiv e-prints
- Pub Date:
- July 2023
- DOI:
- arXiv:
- arXiv:2307.13481
- Bibcode:
- 2023arXiv230713481H
- Keywords:
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- Mathematics - Functional Analysis;
- 42C40 (Primary);
- 42C15;
- 11K38 (Secondary)
- E-Print:
- 5 pages, presented at SampTA 2023 (14th International conference on Sampling Theory and Applications), corrected a typographical error over the published version