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    Wyświetlanie 1-5 z 5
    Tytuł:
    Analytical Models for Distribution of the Envelope and Phase of Linearly Modulated Signals in AWGN Channel
    Autorzy:
    Moazzeni, T
    Jiang, Y.
    Selvaraj, H.
    Chen, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/226459.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital modulation
    linear modulation
    probability density function
    phase
    AWGN
    Opis:
    In this paper, analytical expressions for the distribution of the envelope and phase of linearly modulated signals such as BPSK, M-PSK, and M-QAM in AWGN are presented. We perform numerical simulations for different orders of signal constellations. The results show that the proposed theoretical models are in excellent agreement with the estimated distributions from various numerical experiments.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 1; 79-82
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of all-optical logic XOR gate based on linear optical amplifier cross-gain modulation
    Autorzy:
    Li, X
    Jin, J
    Li, H
    Zhang, Q
    Powiązania:
    https://bibliotekanauki.pl/articles/174514.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    linear optical amplifier
    cross-gain modulation
    XOR gate
    Opis:
    All-optical logic is the key to future high speed and large capacity optical transmission, the realization of optical packet switching and optical computing, and it has a very profound influence on the development of future optical communication. A linear optical amplifier as a new type of semiconductor optical amplifier, which has a good gain characteristic, has better signal performance than a traditional semiconductor optical amplifier in the wavelength conversion. This article presents a numerical simulation model of all-optical logic XOR gate and its logic operation based on cross-gain modulation of linear optical amplifier, and has also completed some of the basic logic operations, including AND, OR, NOT operations.
    Źródło:
    Optica Applicata; 2015, 45, 4; 447-457
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The simple analysis method of nonlinear frequency distortions in FMCW radar
    Autorzy:
    Kulpa, K. S.
    Wojtkiewicz, A.
    Nałęcz, M.
    Misiurewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/309080.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    radar
    nonlinear frequency distortions
    linear frequency modulation
    Opis:
    The paper presents a simple method for estimating nonlinear frequency distortions of linear frequency modulated (LFM) signals used in FMCW radars. This method, derived from the polynomial model of the nonlinear FM signal phase, is based on finding the maximum of two-dimensional chirp-like transform of the IF video signal. The IF signal is obtained by mixing transmitted FM signal with its delayed copy. Using suggested transform we show that the presented method is able to detect and classify signal distortions.
    Źródło:
    Journal of Telecommunications and Information Technology; 2001, 4; 26-29
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaotic convection of viscoelastic fluid in porous medium under G-jitter
    Autorzy:
    Bhadauria, B. S.
    Singh, A.
    Singh, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265559.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    teoria nieliniowa
    grawitacja
    konwekcja
    non-linear theory
    gravity modulation
    chaotic convection
    Opis:
    The present article aims at investigating the effect of gravity modulation on chaotic convection of a viscoelastic fluid in porous media. For this, the problem is reduced into Lorenz system (non-autonomous) by employing the truncated Galerkin expansion method. The system shows transitions from periodic to chaotic behavior on increasing the scaled Rayleigh number R. The amplitude of modulation advances the chaotic nature in the system while the frequency of modulation has a tendency to delay the chaotic behavior which is in good agreement with the results due to [1]. The behavior of the scaled relaxation and retardation parameter on the system is also studied. The phase portrait and time domain diagrams of the Lorenz system for suitable parameter values have been used to analyze the system.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 37-51
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation of PID on PIC24F series microcontroller for speed control of a DC motor using MPLAB and Proteus
    Autorzy:
    Aslam, S.
    Hannan, S.
    Sajjad, U.
    Zafar, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/102984.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    proportional integral derivative controller
    pulse width modulation (PWM)
    linear quadratic regulator
    peripheral interface controller
    MPLAB
    proteus
    duty cycle
    Opis:
    Speed control of a DC motor is critical in most industrial systems where accuracy and protection are of essence. This paper presents simulations of Proportional Integral Derivative Controller (PID) on a 16-bit PIC 24F series microcontroller for speed control of a DC motor in the presence of load torque. The PID gains have been tuned by Linear Quadratic Regulator (LQR) technique and then it is implemented on a microcontroller using MPLAB, and finally simulated for speed control of a DC motor in Proteus Virtual System Modeling (VSM) software. Proteus has built in feature to add load torque to a DC motor so simulation results have been presented in three cases speed of DC motor is controlled without load torque, with 25% load torque and with 50% load torque. In all three cases PID effectively controls the speed of DC motor with minimum steady state error.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 31; 40-50
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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