Harmonic Analysis and Applications

June 4-8, 2018


"Generalized localization operators: Cohen's class and trace class operators"

Luef, Franz

We study generalized localization operators from the perspective of quantum harmonic analysis which allows us to extend known results from the rank-one case to trace class operators. The idea of localizing a signal to a domain in phase space is approached from various directions such as bounds on the spreading function, probability densities associated to generalized localization operators, positive operator valued measures, positive correspondence rules and variants of Tauberian theorems for operator translates. Our results include a rigorous treatment of multiwindow-STFT filters and a characterization of generalized localization operators as positive correspondence rules. Furthermore we provide a description of the Cohen class in terms of Werner's convolution of operators and deduce consequences on positive Cohen class distributions, an uncertainty principle, uniqueness and phase retrieval for general elements of Cohen's class. This is joint work with Eirik Skrettingland.

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