Browsing by Keywords "Localization"

Now showing items 21-34 of 34

    • 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 ...

    • Observation of cavity structures in composite metamaterials 

      Caglayan, H.; Özbay, Ekmel (S P I E - International Society for Optical Engineering, 2010-07-29)
      We investigated the cavity structure by the deformation of a unit cell of a Composite Metamaterial (CMM) structure. We considered different cavity structures with different resonance frequencies and Q-factors. We observed ...

    • 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 jammer placement in wireless localization networks 

      Gezici, Sinan; Bayram, S.; Gholami, M. R.; Jansson, M. (IEEE, 2015-06-07)
      The optimal jammer placement problem is proposed for a wireless localization network, where the aim is to degrade the accuracy of locating target nodes as much as possible. In particular, the optimal location of a jammer ...

    • Optimal jammer placement in wireless localization systems 

      Gezici, Sinan; Bayram, S.; Kurt, M. N.; Gholami, M. R. (Institute of Electrical and Electronics Engineers Inc., 2016)
      In this study, the optimal jammer placement problem is proposed and analyzed for wireless localization systems. In particular, the optimal location of a jammer node is obtained by maximizing the minimum of the Cramér-Rao ...

    • Optimal jamming of wireless localization systems 

      Gezici, Sinan; Gholami, M.R.; Bayram, S.; Jansson, M. (IEEE, 2015-06)
      In this study, optimal jamming of wireless localization systems is investigated. Two optimal power allocation schemes are proposed for jammer nodes in the presence of total and peak power constraints. In the first scheme, ...

    • 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, ...

    • Position estimation in visible light systems in the presence of malicious LED transmitters 

      Kökdoğan, Furkan; Gezici, Sinan (IEEE, 2021-09-06)
      We focus on a visible light positioning system in which a receiver performs position estimation based on signals emitted from a number of light emitting diode (LED) transmitters. Each LED transmitter can be malicious and ...

    • Power allocation strategies for channel switching and wireless localization 

      Sezer, Ahmet Dündar (Bilkent University, 2018-08)
      Optimal power allocation is an important approach for enhancing performance of both communication and localization systems. In this dissertation, optimal channel switching problems are investigated for average capacity ...

    • Power control games between anchor and jammer nodes in wireless localization networks 

      Sezer, Ahmet Dündar; Gezici, Sinan (Institute of Electrical and Electronics Engineers, 2018)
      In this paper, a game theoretic framework is proposed for wireless localization networks that operate in the presence of jammer nodes. In particular, power control games between anchor and jammer nodes are designed for a ...

    • Range estimation using simple infrared sensors without prior knowledge of surface parameters 

      Yüzbaşıoğlu, Çağrı; Barshan, Billur (IEEE, 2004)
      This paper describes a new method for range estimation using low-cost infrared sensors. The intensity data obtained with infrared sensors depends highly on the surface properties and the configuration of the sensors and ...

    • Strictly localized states in the octagonal Ammann-Beenker quasicrystal 

      Oktel, Mehmet Özgür (American Physical Society, 2021-07-06)
      Ammann-Beenker lattice is a two-dimensional quasicrystal with eightfold symmetry, which can be described as a projection of a cut from a four-dimensional simple cubic lattice. We consider the vertex tight-binding model on ...

    • A study of localization metrics: evaluation of position errors in wireless sensor networks 

      Aksu, H.; Aksoy, D.; Korpeoglu, I. (Elsevier BV, 2011)
      For wireless sensor network applications that require location information for sensor nodes, locations of nodes can be estimated by a number of localization algorithms, which inevitably may introduce various types of errors ...

    • Visible light positioning in the presence of malicious LED transmitters 

      Kökdoğan, Furkan; Gezici, Sinan (IEEE, 2022-10-26)
      We consider a visible light positioning system in which a receiver performs position estimation based on signals emitted from a number of light emitting diode (LED) transmitters. Each LED transmitter can be malicious and ...