• Title/Summary/Keyword: Parseval frames

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TIGHT MATRIX-GENERATED GABOR FRAMES IN $L^2(\mathbb{R}^d)$ WITH DESIRED TIME-FREQUENCY LOCALIZATION

  • Christensen, Ole;Kim, Rae-Young
    • Journal of applied mathematics & informatics
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    • v.26 no.5_6
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    • pp.1247-1256
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    • 2008
  • Based on two real and invertible $d{\times}d$ matrices Band C such that the norm $||C^T\;B||$ is sufficiently small, we provide a construction of tight Gabor frames $\{E_{Bm}T_{Cn}g\}_{m,n{\in}{\mathbb{Z}^d}$ with explicitly given and compactly supported generators. The generators can be chosen with arbitrary polynomial decay in the frequency domain.

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SHARPENING LOWER BOUND IN SOME INEQUALITIES FOR FRAMES IN HILBERT SPACES

  • Sultanzadeh, Fahimeh;Hassani, Mahmood;Omidvar, Mohsen Erfanian;Gol, Rajab Ali kamyabi
    • Korean Journal of Mathematics
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    • v.29 no.4
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    • pp.725-732
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    • 2021
  • This paper aims to present a new lower bound for some inequalities related to Frames in Hilbert space. Some refinements of the inequalities for general frames and alternate dual frames under suitable conditions are given. These results refine the remarkable results obtained by Balan et al. and Gavruta.