Explicit constructions and properties of generalized shift-invariant systems in L2(R)

Ole Christensen, Marzieh Hasannasabjaldehbakhani, Jakob Lemvig

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Generalized shift-invariant (GSI) systems, originally introduced by Hernández et al. and Ron and Shen, provide a common frame work for analysis of Gabor systems, wavelet systems, wave packet systems, and other types of structured function systems. In this paper we analyze three important aspects of such systems. First, in contrast to the known cases of Gabor frames and wavelet frames, we show that for a GSI system forming a frame, the Calderón sum is not necessarily bounded by the lower frame bound. We identify a technical condition implying that the Calderón sum is bounded by the lower frame bound and show that under a weak assumption the condition is equivalent with the local integrability condition introduced by Hernández et al. Second, we provide explicit and general constructions of frames and dual pairs of frames having the GSI-structure. In particular, the setup applies to wave packet systems and in contrast to the constructions in the literature, these constructions are not based on characteristic functions in the Fourier domain. Third, our results provide insight into the local integrability condition (LIC).
Original languageEnglish
JournalAdvances in Computational Mathematics
Issue number2
Pages (from-to)443–472
Publication statusPublished - 2016


  • Dual frames
  • Frame
  • Gabor system
  • Generalized shift invariant system
  • LIC
  • Local integrability condition
  • Wave packets
  • Wavelets


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