Now showing items 62-81 of 89

    • On channel estimation for spatial modulated systems over time-varying channels 

      Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (Academic Press Inc Elsevier Science, 525 B St, Ste 1900, San Diego, Ca 92101-4495 USA, 2015-02)
      Spatial Modulation (SM) has been proposed recently for multiple-input multiple-output (MIMO) systems to cope with the interchannel interference and to reduce the detection complexity as compared to the conventional MIMO ...
    • Performance Improvement for Correlated 4x4 MIMO-OFDM Systems by Generalized Prefix Approach 

      Acar, Yusuf; Cooklev, Todor; Doğan, Hakan; Yıldız, Hakan (IEEE, 345 E 47Th St, New York, Ny 10017 Usa, 2013)
      Antenna correlation limits the multiplexing gain achieved by practical MIMO-OFDM systems and degrades the performance significantly. Recently, investigations are focused to reduce the antenna correlation by the designing ...
    • Pilot symbol aided channel estimation for spatial modulation-OFDM systems and its performance analysis with different types of interpolations 

      Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (Springer, 233 Spring St, New York, Ny 10013 USA, 2017-06)
      Spatial modulation orthogonal frequency division multiplexing (SM-OFDM) system has been recently proposed as an alternative for multiple-input multiple-output (MIMO)-OFDM systems to increase spectral efficiency by keeping ...
    • Pilot symbol assisted channel estimation for 4x4 space time block coded spatial modulation systems 

      Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (IEEE, 345 E 47th St, New York, Ny 10017 USA, 2015)
      Recently, spatial modulation (SM) and space-time block coding (STBC) are combined to take advantage of the benefits of both while avoiding their drawbacks for multiple-input and multiple-output (MIMO) systems. The pioneering ...
    • Posterior Cramer-Rao Lower Bounds for Dual Kalman estimation 

      Saatçı, Esra; Akan, Aydın (Academic Press inc Elsevier Science, 525 B St, Ste 1900, San Diego, Ca 92101-4495 USA, 2012-01)
      We present the Posterior Cramer-Rao Lower Bounds (PCRLB) for the dual Kalman filter estimation where the parameters are assumed to be time-invariant and stationary random variables. Relations between the PCRLB, the states, ...
    • Power converters as natural gyrators 

      Ehsani, Mehrdad; Husain, Iqbal; Bilgiç, Mehmet Oruç (IEEE, 1993-12)
      The authors investigate the open-loop gyrator behavior of a class of DC-DC converters that are characterized by double bridges. If the switching frequency of the double bridge converter is high enough with respect to its ...
    • Radiation Characteristics Of A Coaxial Waveguide With Opposing Dielectric Filled Grooves 

      Hacıvelioğlu, Feray; Uzgören, Gökhan; Büyükaksoy, Alinur (Inst Engineering Technology-Iet, Michael Faraday House Six Hills Way Stevenage, Hertford Sg1 2Ay, England, 2010-01)
      The purpose of the present study is to provide a rigorous analysis to the coaxial waveguide with two opposing grooves in the outer and inner cylinders with different depths and filled with different dielectric materials. ...
    • Real-time Frame Buffer Implementation based on External Memory using FPGA 

      Davutoğlu, Doğancan (Elsevier, 2018-05)
      In this paper, design of a real-time video frame buffer with an external memory interface is proposed. In addition, simulation and implementation processes of the design is described. The mentioned system is able to buffer ...
    • Receiver Design for Dual-Mode Index Modulation Aided OFDM 

      Acar, Yusuf; Aldırmaz Çolak, Sultan (2019-04-12)
      Nowadays, variants of Spatial Modulation (SM) are studied by a lot of researchers in order to increase Spectral Efficiency (SE) more. One of the important variants of SM is known as Orthogonal Frequency Division Multiplexing ...
    • Relationship Between Emotional Intelligence and Foreign Language Learning 

      Tekin, Abdulkadir; Yıldırım, Halil; Yıldırım, Osman (Int Scientific Conference SGEM, 14, Kilment Ohridsky BLVD, Sofia, 1797, Bulgaria, 2008)
      The increasing number of recent researches indicates that emotional intelligence is more important than IQ in many fields. In literature, many quantitative findings indicate that there is a significant relationship between ...
    • RESPIRATORY PARAMETER ESTIMATION IN LINEAR LUNG MODELS 

      Saatçı, Esra; Akan, Aydın (IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA, 2008)
      If the respiratory system Is represented as a one compartment model composed of linear electrical elements, the Minimum Variance Unbiased Estimation (MVUE) Is the optimum statistical method to estimate the model parameters. ...
    • Respiratory Parameter Estimation In Non-İnvasive Ventilation Based On Generalized Gaussian Noise Models 

      Saatçı, Esra; Akan, Aydın (Elsevier Science Bv, Po Box 211, 1000 Ae Amsterdam, Netherlands, 2010-02)
      Modeling of respiratory system under non-invasive ventilation by using measured respiratory signals is of great interest in respiratory mechanics research area. Statistical processing techniques in the time-domain may be ...
    • Simulation of a C-Dump Switched Reluctance Motor Drive 

      Özbulur, Veysel; Bilgiç, Mehmet Oruç (1995)
    • Spline Based Channel Estimation for STBC-SM Systems over Fast-Varying Rician Fading Channels 

      Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (IEEE, 345 E 47Th St, New York, Ny 10017 USA, 2015-05-16)
      In the STBC-SM systems, the information is carried both by STBC symbols and indices of the transmit antennas from which these symbols are transmitted. Channel estimation is a critical process at the receiver during the ...
    • TEM Wave Scattering by a Step Discontinuity on the Outer Wall of a Coaxial Waveguide 

      Akşimşek, Sinan; Çınar, Gökhan; Nilsson, Börje; Nordebo, Sven (2013-08)
      In this paper, the propagation of TEM waves along a coaxial waveguide with a step discontinuity on its outer wall is investigated rigorously by applying the direct Fourier transform and reducing the problem into the solution ...
    • Texture Analysis Based Iris Recognition 

      Gürkan, Güray; Akan, Aydın (2006-01)
      In this paper, we present a new method for personal identification, based on iris patterns. The method composed of iris image acquisition, image preprocessing, feature extraction and finally decision stages. Normalized ...
    • The effect of emotional intelligence on job satisfaction: a case study in education 

      Özer, Aslıhan; Dede, Nazan; Yıldırım, Osman (Int Scientific Conference SGEM, 14, Kilment Ohridsky Blvd, Sofia, 1797, Bulgaria, 2008)
      The importance of understanding Emotional intelligence (EI) skills has gravitated form the business management to training activities. The increasing number of recent researches oil this relatively new subject have been ...
    • The impact of social intelligence on academic achievement 

      Bal, Pervin; Yıldırım, Osman; Yıldırım, Halil (Int Scientific Conference SGEM, 14, Kilment Ohridsky Blvd, Sofia, 1797, Bulgaria, 2008)
      In the research, The Resilience Scale for Adults (RSA-scale) proposed by Hjemdal, Friborg, Martinussen, and Rosenvinge was used to assess students' social intelligence. RSA-scale is consisted of 45 items including live ...
    • Three- dimensional circular various weave patterns in woven preform structures 

      Bilişik, Kadir; Şahbaz Karaduman, Nesrin; Bilişik, Nedim Erman; Bilişik, Havva Esra (Sage Publications Ltd, 1 Olivers Yard, 55 City Road, London Ec1Y 1Sp, England, 2014-04)
      The aim of this study was to develop three-dimensional (3D) fully interlaced representative circular woven preform structures and to understand the effects of weave pattern and number of layers on 3D circular woven structures. ...
    • Three-Dimensional Fully Interlaced Woven Preforms for Composites 

      Bilişik, Nedim Erman; Bilişik, Havva Esra; Bilişik, Abdulkadir; Şahbaz Karaduman, Nesrin (Sage Publications Ltd, 1 Olivers Yard, 55 City Road, London Ec1Y 1Sp, England, 2013-11)
      The aim of this study was to develop three-dimensional (3D) fully interlaced and semi-interlaced representative woven preform structures and to understand the effects of weave pattern and number of layers on 3D woven ...