Browsing Ústav telekomunikací by Title

Now showing items 1-20 of 128

  • Activation Process of ONU in EPON/GPON/XG-PON/NG-PON2 Networks 

    Horváth, Tomáš; Münster, Petr; Oujezský, Václav; Vojtěch, Josef (MDPI, 2018-10-16)
    This article presents a numerical implementation of the activation process for gigabit and 10 gigabit next generation and Ethernet passive optical networks. The specifications are completely different because GPON, XG-PON, ...

  • An Additional Approach to Model Current Followers and Amplifiers with Electronically Controllable Parameters from Commercially Available ICs 

    Šotner, Roman; Kartci, Aslihan; Jeřábek, Jan; Herencsár, Norbert; Dostál, Tomáš; Vrba, Kamil (Versita, 2012-11-22)
    Several behavioral models of current active elements for experimental purposes are introduced in this paper. These models are based on commercially available devices. They are suitable for experimental tests of current- ...

  • Adjustable Multiphase Sinusoidal Oscillator with Fractional–Order Elements 

    Dvořák, Jan; Kubánek, David; Koton, Jaroslav; Jeřábek, Jan; Smékal, David (IEEE, 2019-10-30)
    This paper presents a fractional–order multiphase oscillator with adjustable FO (Frequency of Oscillation). The oscillator utilizes the following components: CCTA (Current Conveyor Transconductance Amplifier), OTA (Operational ...

  • Analogue Implementation of a Fractional-Order PI^{\lambda} Controller for DC Motor Speed Control 

    Herencsár, Norbert; Kartci, Aslihan; Koton, Jaroslav; Šotner, Roman; Alagoz, Baris Baykant; Yeroglu, Celaleddin (IEEE, 2019-06-12)
    In this paper, an approach to design a fractional-order integral operator s(lambda) where -1 < lambda <0, using an analogue technique, is presented. The integrator with a constant phase angle -80.1 degree (i.e. order lambda ...

  • Analysis and Verification of Identical-Order Mixed Matrix Fractional-Order Capacitor Networks 

    Kartci, Aslihan; Agambayev, Agamyrat; Herencsár, Norbert; Salama, Khaled Nabil (IEEE, 2018-07-02)
    In the open literature while capacitors are introduced with -90 degrees phase angle, here we described our fabricated polymer composite, mixed matrix, as a fractional-order capacitor (FoC). The effect on phase and ...

  • Analytical TCP Model for Millimeter-Wave 5G NR Systems in Dynamic Human Body Blockage Environment 

    Moltchanov, Dmitri; Ometov, Aleksandr; Kustarev, Pavel; Evsutin, Oleg; Hošek, Jiří; Koucheryavy, Yevgeni (MDPI, 2020-07-12)
    Dynamic blockage of radio propagation paths between the user equipment (UE) and the 5G New Radio (NR) Base Station (BS) induces abrupt rate fluctuations that may lead to sub-optimal performance of the Transmission Control ...

  • Application for GPON Frame Analysis 

    Holík, Martin; Horváth, Tomáš; Oujezský, Václav (MDPI, 2019-06-21)
    This article presents a design of a database model used to gather and analyze data frames transmitted over gigabit passive optical network (GPON) in the downstream direction. An issue with this kind of system is the ...

  • Applications of novel behavioral implementation of a controllable generalized current conveyor 

    Šotner, Roman; Langhammer, Lukáš; Petržela, Jiří; Domanský, Ondřej; Dostál, Tomáš (IEEE, 2018-04-20)
    This contribution presents a novel modification of a behavioral model for a generalized current conveyor of second generation based on commercially available active devices. This model is suitable for preliminary tests of ...

  • Balanced-Output CCCFOA and Its Utilization in Grounded Inductance Simulator with Various Orders 

    Herencsár, Norbert (IEEE, 2018-07-04)
    In this paper, a new realization of current-controlled current feedback operational amplifier with balanced voltage outputs (BO-CCCFOA) is presented. A resistorless grounded lossless positive inductance simulator (PIS) ...

  • Behavioral model for emulation of ZC-CG-VDCC 

    Jeřábek, Jan; Šotner, Roman; Herencsár, Norbert; Vrba, Kamil; Dostál, Tomáš (The Institute of Electronics, Information and Communication Engineers (IEICE), 2016-01-29)
    This paper presents a proposal and an experimental analysis of behavioral emulator of so-called z-copy controlled-gain voltage differencing current conveyor (ZC-CG-VDCC) based on commercially available devices. Most of ...

  • Blockchain Evaluation Approaches: State-of-the-Art and Future Perspective 

    Smetanin, Sergey; Ometov, Aleksandr; Komarov, Mikhail; Mašek, Pavel; Koucheryavy, Yevgeni (MDPI, 2020-06-13)
    The present increase of attention toward blockchain-based systems is currently reaching a tipping point with the corporate focus shifting from exploring the technology potential to creating Distributed Ledger Technology ...

  • Botnet C&C Traffic and Flow Lifespans Using Survival Analysis 

    Oujezský, Václav; Horváth, Tomáš; Škorpil, Vladislav (International Science and Engineering Society, o.s., 2017-03-27)
    This paper addresses the issue of detecting unwanted traffic in data networks, namely the detection of botnet networks. In this paper, we focused on a time behavioral analysis, more specifically said – lifespans of a ...

  • Changes in Phonation and Their Relations with Progress of Parkinson’s Disease 

    Galáž, Zoltán; Mekyska, Jiří; Zvončák, Vojtěch; Mucha, Ján; Kiska, Tomáš; Smékal, Zdeněk; Eliášová, Ilona; Mráčková, Martina; Košťálová, Miroslava; Rektorová, Irena; Faúndez Zanuy, Marcos; Alonso-Hernandez, Jesus; Gomez-Vilda, Pedro (MDPI, 2019-01-22)
    Hypokinetic dysarthria, which is associated with Parkinson’s disease (PD), affects several speech dimensions, including phonation. Although the scientific community has dealt with a quantitative analysis of phonation in ...

  • A CMOS Multiplied Input Differential Difference Amplifier: A New Active Device and Its Applications 

    Šotner, Roman; Jeřábek, Jan; Prokop, Roman; Kledrowetz, Vilém; Polák, Josef (MDPI AG, 2017-01-26)
    This paper presents a newly developed active device, referred to as a multiplied input differential difference amplifier (MIDDA), which allows operations of summation/subtraction and multiplication of input signals. It was ...

  • CMOS-based active RC sinusoidal oscillator with four-phase quadrature outputs and single-resistance-controlled (SRC) tuning laws 

    Lahiri, Abhirup; Herencsár, Norbert (Elsevier, 2012-09-07)
    This paper proposes a very compact CMOS realization of active RC sinusoidal oscillator capable of generating four quadrature voltage outputs. The oscillator is based on the cascade of lossless and lossy integrators in loop. ...

  • Compact MOS-RC Voltage-Mode Fractional-Order Oscillator Design 

    Kartci, Aslihan; Herencsár, Norbert; Koton, Jaroslav; Psychalinos, Costas (IEEE, 2017-09-04)
    A new voltage-mode fractional-order oscillator, employing in total 12 Metal-Oxide-Semiconductor (MOS) transistors, is introduced in this paper. The proposed circuit is composed of two operational transconductance amplifiers, ...

  • Comparative Study of Discrete Component Realizations of Fractional-Order Capacitor and Inductor Active Emulators 

    Tsirimokou, Georgia; Kartci, Aslihan; Koton, Jaroslav; Herencsár, Norbert; Psychalinos, Costas (World Scientific, 2018-02-06)
    Due to the absence of commercially available fractional-order capacitors and inductors, their implementation can be performed using fractional-order differentiators and integrators, respectively, combined with a ...

  • Comparative Study of Distributed Estimation Precision by Average Consensus Weight Models 

    Kenyeres, Martin; Kenyeres, Jozef (Croatian Communications and Information Society, 2017-12-21)
    Distributed algorithms for an aggregate function estimation are an important complement of many real-life applications based on wireless sensor networks. Achieving a high precision of an estimation in a shorter time can ...

  • Comparative Study of Op-Amp-based Integrators Suitable for Fractional-Order Controller Design 

    Herencsár, Norbert; Kartci, Aslihan; Yildiz, Hacer A.; Šotner, Roman; Dvořák, Jan; Kubánek, David; Jeřábek, Jan; Koton, Jaroslav (IEEE, 2019-07-01)
    In this paper, a fractional-order capacitor (FOC) of an order = 0.89 (i.e. constant phase angle –80.1 degree) was emulated via Valsa RC network with five branches. The network component values were optimized using modified ...

  • Comparison of Bit Error Rate of Line Codes in NG-PON2 

    Horváth, Tomáš; Fujdiak, Radek; Čučka, Milan; Mišurec, Jiří; Mangová, Marie (IJATES, 2016-05-31)
    This article focuses on simulation and comparison of line codes NRZ (Non Return to Zero), RZ (Return to Zero) and Miller’s code for NG-PON2 (Next-Generation Passive Optical Network Stage 2) using.