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Optimal Gabor frame bounds for separable lattices and estimates for Jacobi theta functions

We study sharp frame bounds of Gabor frames with the standard Gaussian window and prove that the square lattice optimizes both the lower and the upper frame bound among all rectangular lattices. This proves a conjecture of Floch, Alard & Berrou (as reformulated by Strohmer & Beaver). The proof is based on refined log-convexity/concavity estimates for the Jacobi theta functions $θ_3$ and $θ_4$.

preprint2016arXivOpen access
Markus FaulhuberStefan Steinerberger
math.FA
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Markus FaulhuberStefan Steinerberger

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