Generalized bent functions and their properties |
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Authors: | PV Kumar RA Scholtz LR Welch |
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Institution: | Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089-0272 USA |
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Abstract: | Jet Jqm denote the set of m-tuples over the integers modulo q and set , . As an extension of Rothaus' notion of a bent function, a function f, f: Jqm → Jq1 is called bent if all the Fourier coefficients of wf have unit magnitude. An important feature of these functions is that their out-of-phase autocorrelation value is identically zero. The nature of the Fourier coefficients of a bent function is examined and a proof for the non-existence of bent functions over Jqm, m odd, is given for many values of q of the form q = 2 (mod 4). For every possible value of q and m (other than m odd and q = 2 (mod 4)), constructions of bent functions are provided. |
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