Now showing items 1-20 of 163

    • Accuracy limits of distance estimation in visible light systems with RGB LEDs 

      Demirel, İlker; Gezici, Sinan (IEEE, 2019-09)
      The distance estimation problem is investigated for visible light positioning (VLP) systems with red-green-blue (RGB) light emitting diodes (LEDs). The accuracy limits on distance estimation are calculated in terms of the ...
    • Accurate positioning in ultra-wideband systems 

      Soganci, H.; Gezici, Sinan (Institute of Electrical and Electronics Engineers, 2011)
      Accurate positioning systems can be realized via ultra-wideband signals due to their high time resolution. In this article, position estimation is studied for UWB systems. After a brief introduction to UWB signals and their ...
    • Adaptation of two types of processing gains for UWB impulse radio wireless sensor networks 

      Güvenç, I.; Arslan, H.; Gezici, Sinan; Kobayashi, H. (The Institution of Engineering and Technology, 2007)
      Ultrawideband impulse radio systems offer two kinds of processing gains that can be adapted based on the interference level in the system so that quality of service requirements are fulfilled. An adaptive assignment scheme ...
    • Adaptive measurement matrix design for compressed DoA estimation with sensor arrays 

      Özer, Berk; Lavrenko, A.; Gezici, Sinan; Römer, F.; Galdo, G. D.; Arıkan, Orhan (IEEE, 2015)
      In this work we consider the problem of measurement matrix design for compressed 3-D Direction of Arrival (DoA) estimation using a sensor array with analog combiner. Since generic measurement matrix designs often do not ...
    • Average capacity maximization via channel switching in the presence of additive white Gaussian noise channels and switching delays 

      Sezer, A. D.; Gezici, Sinan (Institute of Electrical and Electronics Engineers Inc., 2016)
      The optimal channel switching problem is studied for average capacity maximization in the presence of additive white Gaussian noise channels and channel switching delays. First, an optimization problem is formulated for ...
    • Average Fisher information maximisation in presence of cost-constrained measurements 

      Dulek, B.; Gezici, Sinan (The Institution of Engineering and Technology, 2011)
      An optimal estimation framework is considered in the presence of cost-constrained measurements. The aim is to maximise the average Fisher information under a constraint on the total cost of measurement devices. An optimisation ...
    • Average fisher information optimization for quantized measurements using additive independent noise 

      Balkan, Gokce Osman; Gezici, Sinan (IEEE, 2010)
      Adding noise to nonlinear systems can enhance their performance. Additive noise benefits are observed also in parameter estimation problems based on quantized observations. In this study, the purpose is to find the optimal ...
    • A Bayesian approach to respiration rate estimation via pulse-based ultra-wideband signals 

      Soǧancı, Hamza; Gezici, Sinan; Arıkan, Orhan (IEEE, 2009)
      In this paper, theoretical limits on estimation of respiration rates via pulse-based ultra-wideband (UWB) signals are studied in the presence of prior information about respiration related signal parameters. First, a ...
    • Binary signaling under subjective priors and costs as a game 

      Sarıtaş, S.; Gezici, Sinan; Yüksel, S. (Institute of Electrical and Electronics Engineers Inc., 2019)
      Many decentralized and networked control problems involve decision makers which have either misaligned criteria or subjective priors. In the context of such a setup, in this paper we consider binary signaling problems in ...
    • Birleşik sezim ve kestirim sistemlerinin gürültü ile geliştirilmesi 

      Akbay, Abdullah Başar; Gezici, Sinan (IEEE, 2014-04)
      Belirli koşullar altında, optimal olmayan bazı sezici ve kestiricilerin performansını girdilerine gürültü ekleyerek geliştirmek mümkündür. Bu çalışmada, birleşik bir sezim ve kestirim sisteminin gürültü eklenerek geliştirilmesi ...
    • Centralized and decentralized detection with cost-constrained measurements 

      Laz, E.; Gezici, Sinan (Elsevier B.V., 2017)
      Optimal detection performance of centralized and decentralized detection systems is investigated in the presence of cost constrained measurements. For the evaluation of detection performance, Bayesian, Neyman–Pearson and ...
    • Clutter detection algorithms for airborne pulse-Doppler radar 

      Güngör, Ahmet; Gezici, Sinan (IEEE, 2010)
      Clutter detection is an important stage of target detection. Clutter may not always appear around zero Doppler frequency when realistic terrain models and moving platforms are considered. Two algorithms developed for clutter ...
    • Coded-reference ultra-wideband systems 

      Gezici, Sinan (2008-09)
      Transmitted-reference (TR) and frequency-shifted reference (FSR) ultra-wideband (UWB) systems employ pairs of reference and data signals, which are shifted in the time and frequency domains, respectively, to facilitate ...
    • Cognitive and Cooperative Wireless Networks 

      Palazzo, S.; Dardari, D.; Dohler, M.; Gezici, Sinan; Giupponi, L.; Luise, M.; Pérez Romero, J.; Shamai, S.; Noguet, D.; Moy, C.; Asheid, G. (Springer-Verlag Italia s.r.l., 2012)
      The traditional approach of dealing with spectrum management in wireless communications has been the definition of a licensed user granted with exclusive exploitation rights for a specific frequency. While it is relatively ...
    • Cognitive-radio systems for spectrum, location, and environmental awareness 

      Celebi, H.; Güvenç, I.; Gezici, Sinan; Arslan, H. (IEEE, 2010)
      In order to perform reliable communications, a system needs to have sufficient information about its operational environment, such as spectral resources and propagation characteristics. Cognitive-radio technology has ...
    • 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 ...
    • Comparison of low complexity UWB range estimators based on experimental data 

      Soğancı, Hamza; Gezici, Sinan; Tan, A.S. (IEEE, 2012)
      In this paper, performances of low complexity time based range estimators that are employed for ultra wide-band (UWB) systems are compared using experimental data. These estimators are widely used in practical applications ...
    • A concave-convex procedure for TDOA based positioning 

      Gholami, M. R.; Gezici, Sinan; Strom, E. G. (IEEE, 2013)
      This letter investigates the time-difference-of-arrival based positioning problem in wireless sensor networks. We consider the least-mean absolute, i.e., the ℓ1 norm, minimization of the residual errors and formulate the ...
    • A confidence ellipsoid approach for measurement cost minimization under Gaussian noise 

      Dülek, Berkan; Gezici, Sinan (IEEE, 2012-06)
      The well-known problem of estimating an unknown deterministic parameter vector over a linear system subject to additive Gaussian noise is studied from the perspective of minimizing total sensor measurement cost under a ...
    • Convexity properties of detection probability for noncoherent detection of a modulated sinusoidal carrier 

      Öztürk, Cüneyd; Dülek, B.; Gezici, Sinan (Institute of Electrical and Electronics Engineers, 2018)
      In this correspondence paper, the problem of noncoherent detection of a sinusoidal carrier is considered in the presence of Gaussian noise. The convexity properties of the detection probability are characterized with respect ...