Güncel Gönderiler

  • 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 ...
  • Channel estimation for spatial modulation orthogonal frequency division multiplexing systems 

    Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (IEEE, 345 E 47th St, New York, Ny 10017 USA, 2015-10-14)
    A combination of spatial modulation and orthogonal frequency division multiplexing (SM-OFDM) has been recently proposed for multicarrier systems while assuming the perfect channel state information (P-CSI) available at the ...
  • Fundamental Frequency Estimation for Monophonical Turkish Music by using VMD 

    Öztürk Şimşek, Berrak; Akan, Aydın; Bozkurt, Barış (IEEE, 345 E 47Th St, New York, Ny 10017 USA, 2015-05-16)
    In this study, a new method is presented for the fundamental frequency estimation of Turkish makam music recordings by using Variational Mode Decomposition (VMD). VMD is a method to decompose an input signal into an ensemble ...
  • 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 ...
  • 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 ...
  • Channel Estimation for SM Systems over Time-Varying Rayleigh Fading Channels 

    Acar, Yusuf; Doğan, Hakan; Panayırcı, Erdal (IEEE, 345 E 47Th St, New York, Ny 10017 Usa, 2014)
    This paper is concerned with the challenging and timely problem of channel estimation for spatial modulated systems in the presence of time varying channels. Recently, estimation of channel state information for SM systems ...
  • 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 ...
  • Wireless 3-Axis Accelerometer System for Measurement of Structural Displacement 

    Gürkan, Koray; Gürkan, Güray; Dindar, Ahmet Anıl; Akpınar, Burak; Gülal, Vahap Engin (IEEE, 345 E 47Th St, New York, Ny 10017 Usa, 2013)
    In this study, we present the design of a 3-axis acceleration measurement system that is capable of UTC (Coordinated Universal Time) time-stamping captured from a Global Positioning System (GPS) receiver module. With this ...
  • A New Method for Doppler Centroid Estimation Based on Block Processing 

    Kartal, Mesut; Tunçay, Pelin (IEEE, 345 E 47Th St, New York, Ny 10017 Usa, 2013)
    Doppler centroid frequency is an important parameter for Synthetic Aperture Radar signal processing, which is used to design a proper matched filter in azimuth domain. Doppler centroid is estimated from the received data. ...
  • High-Performance Mimo Ofdm Wireless Systems With Generalized Prefix 

    Acar, Yusuf; Yıldız, Hakan; Cooklev, Todor; Doğan, Hakan (IEEE, 345 E 47Th St, New York, Ny 10017 Usa, 2013)
    Consumers require increasing data rates and therefore it is important to develop techniques that increase the spectrum efficiency. MIMO OFDM is a fundamental technology for high data rate wireless systems. Correlation among ...
  • 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 ...
  • 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, ...
  • Bayesian Compressive Sensing for Ultra-Wideband Channel Models 

    Özgör, Mehmet; Erküçük, Serhat; Çırpan, Hakan Ali (Ieee, 345 E 47Th St, New York, Ny 10017 Usa, 2012-07-03)
    Considering the sparse structure of ultra-wideband (UWB) channels, compressive sensing (CS) is suitable for UWB channel estimation. Among various implementations of CS, the inclusion of Bayesian framework has shown potential ...
  • Estimation Of The Respiratory System Parameters 

    Sert, Görkem; Saatçı, Esra; Gürkan, Güray; Akan, Aydın (European Assoc Signal Speech & Image Processing-Eurasip, Po Box 74251, Kessariani, 151 10, Greece, 2011)
    In clinical respiratory studies, resistance and the lung compliance are two important respiratory parameters that are often measured by physicians. In this work, Respiratory signals (mask pressure, airway flow, and lung ...
  • 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. ...
  • Inverse Modeling of Respiratory System during Noninvasive Ventilation by Maximum Likelihood Estimation 

    Saatçı, Esra; Akan, Aydın (Hindawi Publishing Corporation, 410 Park Avenue, 15Th Floor, #287 Pmb, New York, Ny 10022 Usa, 2010)
    We propose a procedure to estimate the model parameters of presented nonlinear Resistance-Capacitance (RC) and the widely used linear Resistance-Inductance-Capacitance (RIC) models of the respiratory system by Maximum ...
  • Application of Stockwell Coherence To Prediction Of Alertness Under Anaesthesia 

    Gürkan, Güray; Akan, Aydın; Demiralp, Tamer (Brno Univ Technology Vut Press, Purkynova 118, Brno 61200, Czech Republic, 2010)
    In this paper, we represent an application of Stockwell Coherence to scalp EEG signals under anesthesia. By the analysis of overlapping, stationary data segments, we obtained the time-varying Stockwell coherence, which ...
  • 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 ...
  • Dual Kalman Filter based State-Parameter Estimation in Linear Lung Models 

    Akan, Aydın; Saatçı, Esra (Springer, 233 Spring Street, New York, Ny 10013, United States, 2009)
    Time-domain approach to inverse modeling of respiratory system requires estimation of the parameters from the noisy observation. In this work, states and parameters of the linear lung models are estimated simultaneously ...
  • Generalized Gauss Distribution Noise Model for Respiratory Parameter Estimation 

    Saatçı, Esra; Akan, Aydın (Ieee, 345 E 47Th St, New York, Ny 10017 Usa, 2009)
    In this studs, measurement noise is modelled as a Generalized Gauss Distribution and a new method is presented to estimate the model parameters. The estimator algorithm consists of the Kurtosis method, Kalman iterarions ...

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