Browsing by Author "Keskin, M. F."

Now showing items 1-8 of 8

    • Comparative theoretical analysis of distance estimation in visible light positioning systems 

      Keskin, M. F.; Gezici, Sinan (Institute of Electrical and Electronics Engineers Inc., 2016)
      In this paper, theoretical limits and estimators are studied for synchronous and asynchronous visible light positioning (VLP) systems. Specifically, the Cramér-Rao lower bounds (CRLBs) and maximum likelihood estimators are ...

    • Cooperative positioning in wireless networks 

      Gholami, M. R.; Keskin, M. F.; Gezici, Sinan; Jansson, M. (John Wiley & Sons, 2016)
      In this article, we study cooperative positioning in wireless networks in which target nodes at unknown locations locally collaborate with each other to find their locations. We review different models available for ...

    • Improved lower bounds for ranging in synchronous visible light positioning systems 

      Keskin, M. F.; Gonendik, E.; Gezici, Sinan (Institute of Electrical and Electronics Engineers Inc., 2016)
      In this study, the Ziv-Zakai bound (ZZB) is derived for synchronous visible light positioning (VLP) systems. The proposed ZZB extracts ranging information from the prior information, the time delay parameter, and the channel ...

    • Localization via visible light systems 

      Keskin, M. F.; Sezer, A. D.; Gezici, Sinan (Institute of Electrical and Electronics Engineers, 2018)
      Visible light communication (VLC) is an emerging paradigm that enables multiple functionalities to be accomplished concurrently, including illumination, high-speed data communications, and localization. Based on the VLC ...

    • Maximization of average number of correctly received symbols over multiple channels in the presence of idle periods 

      Keskin, M. F.; Kurt, M. N.; Tutay, M. E.; Gezici, Sinan; Arıkan, Orhan (Elsevier Inc., 2016)
      In this study, optimal channel switching (time sharing) strategies are investigated under average power and cost constraints for maximizing the average number of correctly received symbols between a transmitter and a ...

    • On the Impact of hardware impairments on RIS-aided localization 

      Öztürk, Cüneyd; Keskin, M. F.; Wymeersch, H.; Gezici, Sinan (IEEE, 2022-05)
      We investigate a reconfigurable intelligent surface (RIS)-aided near-field localization system with single-antenna user equipment (UE) and base station (BS) under hardware impairments by considering a practical phase-dependent ...

    • Optimal power allocation for jammer nodes in wireless localization systems 

      Bayram, S.; Keskin, M. F.; Gezici, Sinan; Arıkan, Orhan (Institute of Electrical and Electronics Engineers Inc., 2017)
      In this paper, optimal power allocation strategies are investigated for jammer nodes in a wireless localization system. Building upon the concept of the restricted Bayesian approach, a generalized optimization strategy, ...

    • Power-efficient positioning for visible light systems via chance constrained optimization 

      Yazar, Onurcan; Keskin, M. F.; Gezici, Sinan (IEEE, 2020)
      The problem of minimizing total power consumption in light-emitting diode transmitters is investigated for achieving power efficient localization in a visible light communication and positioning system. A robust power ...