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      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Electrical and Electronics Engineering
      • Dept. of Electrical and Electronics Engineering - Master's degree
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      Optimal signal design for visible light positioning under power and illumination constraints

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      Author(s)
      Yazar, Onurcan
      Advisor
      Gezici, Sinan
      Date
      2021-11
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      The optimal design of transmit signals for light-emitting diodes (LEDs) in a visible light positioning (VLP) system is analyzed with the objectives of im-provements in localization accuracy and power efficiency. Specifically, the lo-calization performance maximization problem is addressed for asynchronous and synchronous VLP systems where certain system limitations including power con-sumption, illumination, and effective bandwidth are considered, and the localiza-tion performance is quantified using the Cram´er-Rao lower bound (CRLB). The formulated signal design problems are demonstrated to be convex optimization problems and some properties of the optimal signal design parameters are found. On the other hand, the signal design problem is also formulated for achieving the lowest possible power consumption while guaranteeing a certain localization ac-curacy. Then, the optimal signal design parameters resulted from the solution of these optimization problems are used to construct the optimal transmit signals in the LEDs. The advantages of the optimal signal design approach is demonstrated through the numerical experiments while also presenting a comparison with the state-of-the-art optimal power allocation method in the literature.
      Keywords
      Visible light positioning
      Power efficiency
      Cramer-Rao lower bound
      Convex optimization
      Transmit signal design
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      http://hdl.handle.net/11693/76694
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      • Dept. of Electrical and Electronics Engineering - Master's degree 655
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