Analysis of multipath channel delay estimation using subspace fitting

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Abstract

The presence of rich scattering in indoor and urban radio propagation scenarios may cause a high arrival density of multipath components (MPCs). Often the MPCs arrive in clusters at the receiver, where MPCs within one cluster have similar angles and delays. The MPCs arriving within a single cluster are typically unresolvable in the delay domain. In this paper, we analyze the effects of unresolved MPCs on the bias of the delay estimation with a multiband subspace fitting algorithm. We treat the unresolved MPCs as a model error that results in perturbed subspace estimation. Starting from the first-order approximation of the perturbations, we derive the bias of the delay estimate of the line-of-sight (LOS) component. We show that it depends on the power and relative delay of the unresolved MPCs in the first cluster compared to the LOS component. Numerical experiments are included to show that the derived expression for the bias well describes the effects of unresolved MPCs on the delay estimation.
Original languageEnglish
Title of host publication2020 54nd Asilomar Conference on Signals, Systems, and Computers
Place of PublicationPiscataway, NJ
PublisherIEEE
Pages1070-1074
Number of pages5
ISBN (Electronic)978-0-7381-3126-9
ISBN (Print)978-1-6654-4707-2
DOIs
Publication statusPublished - 2021
Event54th Asilomar Conference on Signals, Systems, and Computers - Virtual/online event at Pacific Grove, United States
Duration: 1 Nov 20204 Nov 2020
Conference number: 54
https://www.asilomarsscconf.org/PastConferences.html

Conference

Conference54th Asilomar Conference on Signals, Systems, and Computers
Abbreviated titleACSSC 2020
CountryUnited States
CityVirtual/online event at Pacific Grove
Period1/11/204/11/20
Internet address

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care

Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • time-of-arrival
  • channel estimation
  • superresolution
  • subspace fitting
  • error analysis
  • bias
  • super-resolution

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