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Published in: Designs, Codes and Cryptography 7/2019

09-10-2018

Equiangular tight frames from group divisible designs

Authors: Matthew Fickus, John Jasper

Published in: Designs, Codes and Cryptography | Issue 7/2019

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Abstract

An equiangular tight frame (ETF) is a type of optimal packing of lines in a real or complex Hilbert space. In the complex case, the existence of an ETF of a given size remains an open problem in many cases. In this paper, we observe that many of the known constructions of ETFs are of one of two types. We further provide a new method for combining a given ETF of one of these two types with an appropriate group divisible design (GDD) in order to produce a larger ETF of the same type. By applying this method to known families of ETFs and GDDs, we obtain several new infinite families of ETFs. The real instances of these ETFs correspond to several new infinite families of strongly regular graphs. Our approach was inspired by a seminal paper of Davis and Jedwab which both unified and generalized McFarland and Spence difference sets. Our main result is a combinatorial analog of their algebraic results.
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Metadata
Title
Equiangular tight frames from group divisible designs
Authors
Matthew Fickus
John Jasper
Publication date
09-10-2018
Publisher
Springer US
Published in
Designs, Codes and Cryptography / Issue 7/2019
Print ISSN: 0925-1022
Electronic ISSN: 1573-7586
DOI
https://doi.org/10.1007/s10623-018-0569-z

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