Mathematics – Functional Analysis
Scientific paper
2006-11-21
International Journal of Wavelets, Multiresolution and Information Processing,, Vol.6, No. 2, March 2008, pp. 315-330
Mathematics
Functional Analysis
20 pages, one figure; preprint
Scientific paper
In this paper we deal with the connection of frames with the class of Hilbert Schmidt operators. First we give an easy criteria for operators being in this class using frames. It is the equivalent to the criteria using orthonormal bases. Then we construct Bessel sequences frames and Riesz bases for the class of Hilbert Schmidt operators using the tensor product of such sequences in the original Hilbert space. We investigate how the Hilbert Schmidt inner product of an arbitrary operator and such a rank one operator can be calculated in an efficient way. Finally we give an algorithm to find the best approximation, in the Hilbert Schmidt sense, of arbitrary matrices by operators called frame multipliers, which multiply the analysis coefficents by a fixed symbol followed by a synthesis.
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