๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

On the Stability of Gabor Frames

โœ Scribed by Wenchang Sun; Xingwei Zhou


Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
106 KB
Volume
26
Category
Article
ISSN
0196-8858

No coin nor oath required. For personal study only.

โœฆ Synopsis


In this paper, we study the stability of Gabor frames ฯ• mb na m n โˆˆ Z . We show that ฯ• mb na m n โˆˆ Z remains a frame under a small perturbation of ฯ• m, or n. Our results improve some results from Favier and Zalik and are applicable to many frequently used Gabor frames. In particular, we study the case for which ฯ• is not compactly supported, and, for the particular case of the Gaussian function, we give explicit stability bounds.


๐Ÿ“œ SIMILAR VOLUMES


On Kadec's 1/4-Theorem and the Stability
โœ Wenchang Sun; Xingwei Zhou ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 51 KB

In Appl. Comput. Harmon. Anal. 2 (1995), 160-173, Favier and Zalik presented a multivariate version of Kadec's 1/4-theorem. But their result contains an additional condition B d (L) < 1. In this paper, we show that this condition may be deleted. In fact, we make a straightforward generalization of K

Density of Gabor Frames
โœ Ole Christensen; Baiqiao Deng; Christopher Heil ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 125 KB

A Gabor system is a set of time-frequency shifts S(g, ) = {e 2ฯ€ibx g(xa)} (a,b)โˆˆ of a function g โˆˆ L 2 (R d ). We prove that if a finite union of Gabor systems r k=1 S(g k , k ) forms a frame for L 2 (R d ) then the lower and upper Beurling densities of = r k=1 k satisfy D -( ) โ‰ฅ 1 and D + ( ) < โˆž.

Moment Problems and Stability Results fo
โœ Ole Christensen ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 160 KB

We show the existence of a "best approximation solution" to the set of equations f, f i = a i , i โˆˆ I, where {f i } iโˆˆI is a frame for a Hilbert space (H, โ€ข, โ€ข ) and {a i } iโˆˆI โˆˆ l 2 (I). We derive formulas showing how the solution changes if {a i } iโˆˆI or {f i } iโˆˆI is perturbed. We explain why the

Approximation of Dual Gabor Frames, Wind
โœ Thomas Strohmer ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 200 KB

We consider two problems involving Gabor frames that have recently received much attention. The first problem concerns the approximation of dual Gabor frames in L 2 (R) by finite-dimensional methods. Utilizing the duality relations for Gabor frames we derive a method to approximate the dual Gabor fr

Analysis of Multiwindow Gabor-Type Schem
โœ Meir Zibulski; Yehoshua Y. Zeevi ๐Ÿ“‚ Article ๐Ÿ“… 1997 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 412 KB

The Gabor scheme is generalized to incorporate several window functions as well as kernels other than the exponential. The properties of the sequence of representation functions are characterized by an approach based on the concept of frames. Utilizing the piecewise Zak transform (PZT), the frame op