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      Distance and position estimation in visible light systems with RGB LEDs

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      Author(s)
      Demirel, I.
      Gezici, Sinan
      Date
      2022-01-17
      Source Title
      Digital Signal Processing
      Print ISSN
      1051-2004
      Electronic ISSN
      1095-4333
      Publisher
      Elsevier
      Volume
      123
      Pages
      1 - 14
      Language
      English
      Type
      Article
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      Abstract
      In this paper, distance and position estimation problems are investigated for visible light positioning (VLP) systems with red-green-blue (RGB) light emitting diodes (LEDs). The accuracy limits on distance and position estimation are calculated in terms of the Cramér-Rao lower bound (CRLB) for three different scenarios. Scenario 1 and Scenario 2 correspond to synchronous and asynchronous systems, respectively, with known channel attenuation formulas at the receiver. In Scenario 3, a synchronous system is considered but channel attenuation formulas are not known at the receiver. The derived CRLB expressions reveal the relations among distance/position estimation accuracies in the considered scenarios and lead to intuitive explanations for the benefits of using RGB LEDs. In addition, maximum likelihood (ML) estimators are derived in all scenarios, and it is shown that they can achieve close performance to the CRLBs in some cases for sufficiently high source optical powers. © 2022 Elsevier Inc.
      Keywords
      Cramér-Rao lower bound
      LED
      Maximum likelihood estimation
      Positioning
      RGB
      Visible light
      Permalink
      http://hdl.handle.net/11693/111538
      Published Version (Please cite this version)
      https://dx.doi.org/10.1016/j.dsp.2022.103423
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      • Department of Electrical and Electronics Engineering 4011
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