Uniform erasure robustness conjecture for random Gabor frames

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Let (g,Λ)(g,\Lambda) be a Gabor frame with gg uniformly distributed on the unit sphere SM−1\mathbb{S}^{M-1}, and let Λ⊂ZM×ZM\Lambda\subset\mathbb{Z}_M\times\mathbb{Z}_M. For p∈[0,1]p\in[0,1], define

Δ(p)=min⁡Λ′⊂Λ,∣Λ′∣≥(1−p)∣Λ∣σmin⁡2(ΦΛ′∗).\Delta(p)=\min_{\substack{\Lambda'\subset\Lambda,\\ |\Lambda'|\geq(1-p)|\Lambda|}}\sigma_{\min}^2(\Phi_{\Lambda'}^*).

Uniform erasure-robustness conjecture. Suppose that ∣Λ∣=O(Mlog⁡αM)|\Lambda|=O(M\log^\alpha M), where α≥0\alpha\geq0 is to be specified. Then, for every p∈(0,1)p\in(0,1), Δ(p)≥C\Delta(p)\geq C with high probability, where C>0C>0 depends only on pp. Numerical experiments suggest that this lower bound is dimension-independent and would establish robustness of the Gabor frame under a fixed proportion of erasures; the permissible exponent α\alpha remains to be determined.

References

Primary source

Palina Salanevich, “Extreme Singular Values of Random Time-Frequency Structured Matrices”, arXiv:1902.01062 (2019).

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