On Inverses of the Dirac Comb

Jens V. Fischer and Rudolf L. Stens
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Jens V. Fischer: German Aerospace Center (DLR), Microwaves and Radar Institute, 82234 Wessling, Germany
Rudolf L. Stens: Lehrstuhl A für Mathematik, RWTH Aachen University, 52056 Aachen, Germany

Mathematics, 2019, vol. 7, issue 12, 1-14

Abstract: We determine tempered distributions which convolved with a Dirac comb yield unity and tempered distributions, which multiplied with a Dirac comb, yield a Dirac delta. Solutions of these equations have numerous applications. They allow the reversal of discretizations and periodizations applied to tempered distributions. One of the difficulties is the fact that Dirac combs cannot be multiplied or convolved with arbitrary functions or distributions. We use a theorem of Laurent Schwartz to overcome this difficulty and variants of Lighthill’s unitary functions to solve these equations. The theorem we prove states that double-sided (time/frequency) smooth partitions of unity are required to neutralize discretizations and periodizations on tempered distributions.

Keywords: tempered distribution; partition of unity; unitary function; Poisson summation formula; Heisenberg uncertainty principle; Paley-Wiener function; Whittaker-Kotel’nikov-Shannon (WKS) (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2019
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