activity
20092026
most citedSampling Theorems for Shift-invariant Spaces, Gabor Frames, and Totally Positive Functions

81 citations · 338 across the 34 of their papers we have counts for

collaborators
Showing 2019Show all

2 papers · 1 filter

math.FA2019

Balian-Low type theorems on homogeneous groups

Karlheinz Gröchenig, José Luis Romero, David Rottensteiner +1

We prove strict necessary density conditions for coherent frames and Riesz sequences on homogeneous groups. Let be a connected, simply connected nilpotent Lie group with a dila…

math.FA2019

Invertibility of frame operators on Besov-type decomposition spaces

José Luis Romero, Jordy Timo van Velthoven, Felix Voigtlaender

We derive an extension of the Walnut-Daubechies criterion for the invertibility of frame operators. The criterion concerns general reproducing systems and Besov-type spaces. As an…