Abstract
A frame in an n-dimensional Hilbert space H n is a possibly redundant collection of vectors {f i } i∈I that span the space. A tight frame is a generalization of an orthonormal basis. A frame {f i } i∈I is said to be scalable if there exist nonnegative scalars {c i } i∈I such that {c i f i } i∈I is a tight frame. In this paper we study the combinatorial structure of frames and their decomposition into tight or scalable subsets by using partially-ordered sets (posets). We define the factor poset of a frame {f i } i∈I to be a collection of subsets of I ordered by inclusion so that nonempty J⊆I is in the factor poset iff {f j } j∈J is a tight frame for H n . We study various properties of factor posets and address the inverse factor poset problem, which inquires when there exists a frame whose factor poset is some given poset P. We then turn our attention to scalable frames and present partial results regarding when a frame can be scaled to have a given factor poset; in doing so we present a bridge between erasure resilience (as studied via prime tight frames) and scalability.
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Communicated by: Yang Wang
Research supported by NSF-REU Grant DMS 11-56890.
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Chan, A.ZY., Copenhaver, M.S., Narayan, S.K. et al. On structural decompositions of finite frames. Adv Comput Math 42, 721–756 (2016). https://doi.org/10.1007/s10444-015-9440-1
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DOI: https://doi.org/10.1007/s10444-015-9440-1