Abstract
We consider the problem of characterizing projective representations that admit frame vectors with the maximal span property, a property that allows for an algebraic recovering for the phase-retrieval problem. For a given multiplier \(\mu \) of a finite abelian group G, we show that the representation dimension of any irreducible \(\mu \)-projective representation of G is exactly the rank of the symmetric multiplier matrix associated with \(\mu \). With the help of this result we are able to prove that every irreducible \(\mu \)-projective representation of a finite abelian group G admits a frame vector with the maximal span property, and obtain a complete characterization for all such frame vectors. Consequently the complement of the set of all the maximal span frame vectors for any projective unitary representation of any finite abelian group is Zariski-closed. These generalize some of the recent results about phase-retrieval with Gabor (or STFT) measurements.
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Acknowledgements
The authors thank the referees very much for carefully reading the paper and for several elaborate and valuable suggestions. Deguang Han is partially supported by the NSF Grants DMS-1403400 and DMS-1712602, and Lan Li is partially supported by Natural Science Basic Research Plan in Shaanxi Province of China (No. 2017JM1046).
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Communicated by Peter G. Casazza.
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Li, L., Juste, T., Brennan, J. et al. Phase Retrievable Projective Representation Frames for Finite Abelian Groups. J Fourier Anal Appl 25, 86–100 (2019). https://doi.org/10.1007/s00041-017-9570-6
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DOI: https://doi.org/10.1007/s00041-017-9570-6