Browsing by Keywords "Estimation"

Now showing items 1-20 of 70

    • Adaptive tracking of narrowband HF channel response 

      Arikan, F.; Arıkan, Orhan (Wiley-Blackwell Publishing, 2003)
      Estimation of channel impulse response constitutes a first step in computation of scattering function, channel equalization, elimination of multipath, and optimum detection and identification of transmitted signals through ...

    • Anchor placement in TOA based wireless localization networks via convex relaxation 

      Öztürk, Cuneyd; Gezici, Sinan (IEEE, 2021-09-06)
      A wireless source localization network consisting of synchronized target and anchor nodes is considered. An anchor placement problem is formulated to minimize the Cramér-Rao lower bound (CRLB) on estimation of target node ...

    • Average distance estimation in randomly deployed wireless sensor networks (WSNs): an analytical study 

      Sevgi, Cüneyt (Inderscience Enterprises, 2019)
      A wireless sensor network (WSN) is an energy-scarce network in which the energy is primarily dissipated by the nodes during data transmission to the base station (BS). The location of the BS dramatically affects the energy ...

    • 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 ...

    • Capacity bounds for an ultra-wideband channel model 

      Arıkan, Erdal (IEEE, 2004-10)
      There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model specified by the same group. The analysis ...

    • 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 ...

    • Comparison of the CAF-DF and sage algorithms in multipath channel parameter estimation 

      Güldoğan, M. Burak; Arıkan, Orhan (IEEE, 2008-07)
      In this paper, performance of the recently proposed Cross Ambiguity Function - Direction Finding (CAF-DF) technique is compared with the Space Alternating Generalized Expectation Maximization (SAGE) technique. The CAF-DF, ...

    • Compressive sampling and adaptive multipath estimation 

      Pilancı, Mert; Arıkan, Orhan (IEEE, 2010)
      In many signal processing problems such as channel estimation and equalization, the problem reduces to a linear system of equations. In this proceeding we formulate and investigate linear equations systems with sparse ...

    • Cooperative visible light positioning systems 

      Erdem, Osman (Bilkent University, 2017-12)
      Light emitting diode (LED) based visible light positioning (VLP) systems o er an alternative approach to commonly used radio frequency (RF) based positioning systems. In the literature, VLP studies are performed only for ...

    • Counting surrounding nodes using DS-SS signals and de Bruijn sequences in blind environment 

      Warty, C.; Seçer, Görkem; Yu, R.W.; Spinsante, S. (IEEE, 2013-03)
      In recent years the technological development has encouraged several applications based on node to node communications without any fixed infrastructure. This paper presents preliminary evaluation of popular estimating ...

    • CRLB based optimal noise enhanced parameter estimation using quantized observations 

      Balkan, G. O.; Gezici, Sinan (IEEE, 2010-02-22)
      In this letter, optimal additive noise is characterized for parameter estimation based on quantized observations. First, optimal probability distribution of noise that should be added to observations is formulated in terms ...

    • Çokyollu kanal parametre kestirimi için yeni bir dizilim sinyal işleme tekniği 

      Güldoǧan, Mehmet Burak; Arıkan, Orhan (IEEE, 2007-06)
      Bu bildiride, çarpraz belirsizlik işlevinin kullanıldığı yeni bir dizilim sinyal işleme tekniği önerilmektedir. Geliştirilen teknik bir algılayıcı dizilimine gelen sinyallerden herbirinin geliş yönünü (GY), zaman gecikmesini ...

    • Differentiation and localization of target primitives using infrared sensors 

      Aytaç, Tayfun; Barshan, Billur (IEEE, 2002-09-10)
      This study investigates the use of low-cost infrared sensors in the differentiation and localization of commonly encountered target primitives in indoor environments, such as planes, corners, edges, and cylinders. The ...

    • Direct and two-step positioning in visible light systems 

      Keskin, Musa Furkan; Gezici, Sinan; Arıkan, Orhan (IEEE, 2018)
      Visible light positioning (VLP) systems based on light emitting diodes can facilitate high accuracy localization services for indoor scenarios. In this paper, direct and two-step positioning approaches are investigated for ...

    • Direct positioning in synchronous and asynchronous visible light systems 

      Keskin, Musa Furkan; Gezici, Sinan; Arıkan, Orhan (IEEE, 2018)
      In this paper, direct positioning approaches are investigated for both synchronous and asynchronous visible light systems. First, the maximum likelihood estimator (MLE) and the Cramér-Rao lower bound (CRLB) are derived for ...

    • Distributed MIMO radar signal processing 

      Ercan, Mahmut Kemal (Bilkent University, 2022-07)
      Radar systems are remote sensing tools that generate electromagnetic waves and extract information by receiving altered versions of these waves. Nowadays, many radar types are being used in specific areas such as weather ...

    • A distributed positioning algorithm for cooperative active and passive sensors 

      Gholami, M.R.; Gezici, Sinan; Rydström, M.; Ström, E.G. (IEEE, 2010)
      The problem of positioning a target node is studied for wireless sensor networks with cooperative active and passive sensors. Two-way time-of-arrival and time-difference-of-arrival measurements made by both active and ...

    • Eavesdropper and jammer selection in wireless source localization networks 

      Öztürk, Cüneyd; Gezici, Sinan (IEEE, 2021-07-26)
      We consider a wireless source localization network in which a target node emits localization signals that are used by anchor nodes to estimate the target node position. In addition to target and anchor nodes, there can ...

    • Eavesdropper selection strategies in wireless source localization networks 

      Öztürk, Cüneyd; Gezici, Sinan (IEEE, 2020)
      We consider a wireless source localization network in which eavesdropper nodes aim to estimate the position of a target node. We formulate the problem of selecting a set of N E positions out of N possible positions for ...