Modelling and studying the effect of graph errors in graph signal processing

Jari Miettinen, Sergiy A. Vorobyov, Esa Ollila*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The first step for any graph signal processing (GSP) procedure is to learn the graph signal representation, i.e., to capture the dependence structure of the data into an adjacency matrix. Indeed, the adjacency matrix is typically not known a priori and has to be learned. However, it is learned with errors. A little attention has been paid to modelling such errors in the adjacency matrix, and studying their effects on GSP methods. However, modelling errors in the adjacency matrix will enable both to study the graph error effects in GSP and to develop robust GSP algorithms. In this paper, we therefore introduce practically justifiable graph error models. We also study, both analytically when possible and numerically, the graph error effect on the performance of GSP methods in different types of problems such as filtering of graph signals and independent component analysis of graph signals (graph decorrelation). (c) 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

Original languageEnglish
Article number108256
Number of pages8
JournalSignal Processing
Volume189
DOIs
Publication statusPublished - Dec 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Erdös-Rényi graphs
  • Error effect
  • Graph signal processing
  • Minimum distance index
  • Shift matrix

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