Now showing items 1-15 of 15

    • Analysis of the nonconcentric radome-enclosed cylindrical reflector antenna system, e-polarization case 

      Oğuzer, T.; Altintas, A. (Taylor & Francis, 2005)
      Two-dimensional (2-D) radiation of a directive complex line source is analyzed in the presence of a perfectly conducting (PEC) reflector antenna system and nonconcentrically located dielectric radome. Similar problem was ...
    • Digital Fourier optics 

      Ozaktas, H. M.; Miller, D. A. B. (Optical Society of America, 1996-03-10)
      Analog Fourier optical processing systems can perform important classes of signal processing operations in parallel, but suffer from limited accuracy. Digital–optical equivalents of such systems could be built that share ...
    • Efficient algorithm to extract components of a composite signal 

      Özdemir, A. K.; Arıkan, O. (IEEE (Institute of Electrical and Electronics Engineers), 2000)
      An efficient algorithm is proposed to extract components of a composite signal. The proposed approach has two stages of processing in which the time-frequency supports of the individual signal components are identified and ...
    • An efficient parallelization technique for high throughput FFT-ASIPs 

      Ishebabi H.; Ascheid G.; Meyr H.; Atak O.; Atalar, Abdullah; Arikan, E. (2006)
      Fast Fourier Transformation (FFT) and it's inverse (IFFT) are used in Orthogonal Frequency Division Multiplexing (OFDM) systems for data (de)modulation. The transformations are the kernel tasks in an OFDM implementation, ...
    • Equiripple FIR filter design by the FFT algorithm 

      Çetin, A. E.; Gerek, Ö. N.; Yardımcı, Y. (Institute of Electrical and Electronics Engineers, 1997-03)
      The fast Fourier transform (FFT) algorithm has been used in a variety of applications in signal and image processing. In this article, a simple procedure for designing finite-extent impulse response (FIR) discrete-time ...
    • Fast and accurate algorithm for the computation of complex linear canonical transforms 

      Koç A.; Ozaktas, H. M.; Hesselink, L. (Optical Society of America, 2010-08-05)
      A fast and accurate algorithm is developed for the numerical computation of the family of complex linear canonical transforms (CLCTs), which represent the input-output relationship of complex quadratic-phase systems. ...
    • Fast and accurate linear canonical transform algorithms 

      Özaktaş H.M.; Koç, A. (Institute of Electrical and Electronics Engineers Inc., 2015)
      Linear canonical transforms are encountered in many areas of science and engineering. Important transformations such as the fractional Fourier transform and the ordinary Fourier transform are special cases of this transform ...
    • Fast computation of the ambiguity function and the Wigner distribution on arbitrary line segments 

      Özdemir, A. K.; Arıkan, O. (IEEE, 2001)
      By using the fractional Fourier transformation of the time-domain signals, closed-form expressions for the projections of their auto or cross ambiguity functions are derived. Based on a similar formulation for the projections ...
    • High resolution time frequency representation with significantly reduced cross-terms 

      Özdemir, K. A.; Arıkan, O. (Institute of Electrical and Electronics Engineers, 2000)
      A novel algorithm is proposed for efficiently smoothing the slices of the Wigner distribution by exploiting the recently developed relation between the Radon transform of the ambiguity function and the fractional Fourier ...
    • High-speed characterization of solar-blind AlxGa 1-xN p-i-n photodiodes 

      Biyikli, N.; Kimukin, I.; Tut, T.; Kartaloglu, T.; Aytur, O.; Ozbay, E. (Institute of Physics, 2004)
      We report on the temporal pulse response measurements of solar-blind AlxGa1-xN-based heterojunction p-i-n photodiodes. High-speed characterization of the fabricated photodiodes was carried out at 267 nm. The bandwidth ...
    • Human activity classification using vibration and PIR sensors 

      Yazar, A.; Çetin, A. E.; Töreyin, B. U. (2012)
      Fall detection is an important problem for elderly people living independently and people in need of care. In this paper, a fall detection method using seismic and passive infrared (PIR) sensors is proposed. Fast Fourier ...
    • Multiple-resampling receiver design for OFDM over Doppler-distorted underwater acoustic channels 

      Tu, K.; Duman, T. M.; Stojanovic, M.; Proakis J. G. (2013)
      In this paper, we focus on orthogonal frequency-division multiplexing (OFDM) receiver designs for underwater acoustic (UWA) channels with user-and/or path-specific Doppler scaling distortions. The scenario is motivated by ...
    • New directional acoustic lens: V-groove lens 

      Bozkurt, A.; Yarahoglu, G.; Atalar, Abdullah; Koymen, H. (IEEE, 1993)
      A new directional acoustic lens is introduced. The geometry is very similar to the line-focus lens except the lens cavity, which is shaped as a groove with flat-bottom V cross section. The slanted planar edges of the groove ...
    • Sparse delay-Doppler image reconstruction under off-grid problem 

      Teke O.; Gurbuz, A.C.; Arikan, O. (IEEE Computer Society, 2014)
      Pulse-Doppler radar has been successfully applied to surveillance and tracking of both moving and stationary targets. For efficient processing of radar returns, delay-Doppler plane is discretized and FFT techniques are ...
    • Support vector networks for prediction of floor pressures in shallow cavity flows 

      Efe, M. Ö.; Debiasi, M.; Yan P.; Özbay, H.; Samimy, M. (2007)
      During the last decade, Support Vector Machines (SVM) have proved to be very successful tools for classification and regression problems. The representational performance of this type of networks is studied on a cavity ...