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    Wyświetlanie 1-12 z 12
    Tytuł:
    Pilot Based MMSE Channel Estimation for Spatial Modulated OFDM Systems
    Autorzy:
    Soman, Anetha Mary
    Nakkeeran, R.
    Shinu, Mathew John
    Powiązania:
    https://bibliotekanauki.pl/articles/2055222.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MIMO
    multicarrier modulation
    spatial modulation
    channel estimation
    channel model
    interpolation
    Opis:
    Due to the multifold growth in demands of multimedia services and mobile data, the request for increased channel capacity in mobile and wireless communication has been quickly increasing. Developing a wireless system with more spectral efficiency under varying channel condition is a key challenge to provide more bit rates with limited spectrum. Multiple Input Multiple Output(MIMO) system with Orthogonal Frequency Division Multiplexing (OFDM) gives higher gain by using the direct and the reflected signals, thus facilitating the transmission at high data rate. An integration of Spatial Modulation (SM) with OFDM (SM OFDM) is a newly evolved transmission technique and has been suggested as a replacement for MIMO -OFDM transmission. In practical scenarios, channel estimation is significant for detecting transmitted data coherently. This paper proposes pilot based, Minimum Mean Square Error (MMSE) channel estimation for the SM OFDM communication system. We have focused on analyzing Symbol Error Rate (SER) and Mean Square error (MSE) under Rayleigh channel employing International Telecommunication Union (ITU) specified Vehicular model of Pilot based MMSE channel estimator using windowed Discrete Fourier Transform (DFT) and MMSE weighting function. Simulation output shows that proposed estimator’s SER performance lies close to that of the MMSE optimal estimator in minimizing aliasing error and suppressing channel noise by using frequency domain data windowing and time domain weighting function. Usage of the Hanning window eliminates error floor and has a compact side lobe level compared to Hamming window and Rectangular window. Hanning window has a larger MSE at low Signal to Noise Ratio (SNR) values and decreases with high SNR values. It is concluded that data windowing technique can minimize the side lobe level and accordingly minimize channel estimation error when interpolation is done. MMSE weighting suppresses channel noise and improves estimation performance. Since Inverse Discrete Fourier Transform(IDFT)/DFT transforms can be implemented with fast algorithms Inverse Fast Fourier Transform( IFFT)/Fast Fourier Transform(FFT) computational complexity can be remarkably reduced.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 685--691
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model reduction using Harris hawk algorithm and moment matching
    Autorzy:
    Sharma, Aswant Kumar
    Sambariya, Dhanesh Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/1955205.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Harris hawk optimization
    ISE
    MIMO
    moment matching
    model order reduction
    SISO
    optymalizacja Harris hawk
    dopasowanie momentu
    redukcja rzędu modelu
    Opis:
    Physical machine systems are represented in the form of differential equations. These differential equations may be of the higher order and difficult to analyses. Therefore, it is necessary to convert the higher-order to lower order which replicates approximately similar properties of the higher-order system (HOS). This article presents a novel approach to reducing the higher-order model. The approach is based on the hunting demeanor of the hawk and escaping of the prey. The proposed method unifies the Harris hawk algorithm and the moment matching technique. The method is applied on single input single output (SISO), multi-input multi-output (MIMO) linear time–invariant (LTI) systems. The proposed method is justified by examining the result. The results are compared using the step response characteristics and response error indices. The response indices are integral square error, integral absolute error, integral time absolute error. The step response characteristics such as rise time, peak, peak time, settling time of the proposed reduced order follows 97%–100% of the original system characteristics.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 959-978
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient model of heat pump cycle
    Autorzy:
    Matysko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/95327.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    heat pump
    transient model
    refrigeration cycle
    MIMO controller
    pompa ciepła
    model przejściowy
    obieg chłodniczy
    sterowanie MIMO
    Opis:
    This paper introduce a transient model of the propane heat pump cycle. The heat pump cycle model includes: a compressor model, a condenser model in lumped parameters, an evaporator model in lumped parameters, an expansion valve model, a heat source model (cooling chamber), a PID control system for heat recovery from superheated refrigerant vapour. The model allows estimate inertia of the heat pump cycle with the system of the heat recovery from superheated propane vapor. The presented theoretical model can determine unsteady and steady state conditions of the different subsystems in the heat pump cycle (condenser, evaporator, compressor). The article presents the results of calculations and determines the time of reaching steady states of the key systems of the heat pump system. The article also presents (in a graphical form) the behavior of the system where the setting was changed after reaching the steady state after 2000s from 50kW to 40kW at the thermal load of the additional heat recovery exchanger.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2018, 2, 2; 139-146
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ship Course Following and Course Keeping in Restricted Waters Based on Model Predictive Control
    Autorzy:
    Liu, H.
    Ma, N.
    Gu, X. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116264.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Movement, Multiple-Input Multiple-Output (MIMO)
    Very Large Crude Carrier (VLCC)
    Model Predictive Control (MPC)
    Linear Quadratic Regulator (LQR)
    course
    restricted waters
    safety at sea
    Opis:
    Ship navigation safety in restricted water areas is of great concern to crew members, because ships sailing in close proximity to banks are significantly affected by the so-called ship-bank interaction. The purpose of this paper is to apply the optimal control theory to help helmsmen adjust ships’ course and maintain the target course in restricted waters. To achieve this objective, the motion of a very large crude carrier (VLCC) close to a bank is modeled with the linear equations of manoeuvring and the influence of bank effect on the ship hydrodynamic force is considered in the model. State-space framework is cast in a Multiple-Input Multiple-Output (MIMO) system, where the offset-free model predictive control (MPC) is designed for course following and the linear quadratic regulator (LQR) is used for course keeping. Simulation results show that the control methods effectively work in ship course following and course keeping with varying ship-bank distances and water depths. The advantage of adopting speed variation as the second control input is obvious.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 305-312
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interference in Multi-beam Antenna System of 5G Network
    Autorzy:
    Kelner, Jan M.
    Ziółkowski, Cezary
    Powiązania:
    https://bibliotekanauki.pl/articles/226986.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    systems and networks
    interference
    multi-elliptical propagation model
    multi-beam antenna system
    simulation studies
    massive MIMO
    Opis:
    Massive multiple-input-multiple-output (MIMO) and beamforming are key technologies, which significantly influence on increasing effectiveness of emerging fifth-generation (5G) wireless communication systems, especially mobile-cellular networks. In this case, the increasing effectiveness is understood mainly as the growth of network capacity resulting from better diversification of radio resources due to their spatial multiplexing in macro- and micro-cells. However, using the narrow beams in lieu of the hitherto used cell-sector brings occurring interference between the neighboring beams in the massive-MIMO antenna system, especially, when they utilize the same frequency channel. An analysis of this effect is the aim of this paper. In this case, it is based on simulation studies, where a multi-elliptical propagation model and standard 3GPP model are used. We present the impact of direction and width of the neighboring beams of 5G new radio gNodeB base station equipped with the multi-beam antenna system on the interference level between these beams. The simulations are carried out for line-of-sight (LOS) and non-LOS conditions of a typical urban environment.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 1; 17-23
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameter estimation of MIMO two-dimensional ARMAX model based on IGLS method
    Autorzy:
    Hayati, Zohreh
    Shafieirad, Mohsen
    Zamani, Iman
    Amiri Mehra, Amir Hossein
    Abbasi, Zohreh
    Powiązania:
    https://bibliotekanauki.pl/articles/2183469.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    ARMAX model
    discrete 2D systems
    iterative identification
    MIMO system
    parameter estimation
    Opis:
    This paper presents an iterative method for the unbiased identification of linearMultiple-InputMultiple-Output (MIMO) discrete two-dimensional (2D) systems. The system discussed here has Auto-Regressive Moving-Average model with exogenous inputs (ARMAX model). The proposed algorithm functions on the basis of the traditional Iterative Generalized Least Squares (IGLS) method. In summary, this paper proposes a two-dimensional Multiple-Input Multiple-Output Iterative Generalized Least Squares (2DMIGLS) algorithm to estimate the unknown parameters of the ARMAX model. Finally, simulation results show the efficiency and accuracy of the presented algorithm in estimating the unknown parameters of the model in the presence of colored noise.
    Źródło:
    Control and Cybernetics; 2021, 50, 3; 303--322
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction control systems in marine applications
    Autorzy:
    Gierusz, W.
    Miller, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117282.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    control system
    marine applications
    ship motion
    automatic system
    Model Predictive Control (MPC)
    multiple input
    Multiple Output (MIMO)
    Model Predictive Heuristic Control (MPHC)
    Generalized Predictive Control (GPC)
    Opis:
    The paper presents one of the modern control methods used for steering of the ship motion. The different automatic systems used to navigate the vessels are described at the beginning. Next, prediction control methodology is presented and multidimensional MPC regulator applied to steering of the training ship is shown as a technical product. Tests results from the real-time experiments with the mentioned controller are presented at the end of the article.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 361-366
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On possibility of applying the MFC idea to control the MIMO processes
    O możliwości zastosowania układu MFC do sterowania procesami o wielu wejściach i wielu wyjściach
    Autorzy:
    Dworak, P.
    Pietrusewicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/155139.pdf
    Data publikacji:
    2006
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dynamiczne odsprzęganie
    regulacja odporna
    regulacja typu model-following
    układy MIMO
    wielowymiarowe układy sterowania
    dynamic decoupling
    robust control
    MIMO (multi-input multi-output)
    multivariable control systems
    Opis:
    The paper presents results of comparative analysis of the control system introducing dynamic decoupling and the robust two-degrees of freedom control system with the use of the decoupled model of the MIMO process. The model loop of the MFC is designed with the use of dynamic decoupling algorithm. The correcting controller in the secondary loop uses the control law based on the knowledge of difference between the model and the process outputs. It is a static diagonal matrix. Presented comparative results from the tracking processes of yaw angle and position of the drillship point the possibility to introduce the MFC scheme into the control system of such process. Model and the main control loop are derived for the nominal case. The results obtained for the other working conditions shows the advantages of proposed here solution.
    Artykuł prezentuje wyniki analizy porównawczej układu regulacji dla obiektów o wielu wejściach i wielu wyjściach MIMO, zaprojektowanego z użyciem algorytmu dynamicznego odsprzęgania, oraz odpornego układu regulacji MFC; zakłada się przy tym, że w pętli głównej regulator wyznaczony jest w drodze syntezy z użyciem dynamicznego odsprzęgania dla nominalnego modelu liniowego, wyznaczonego dla wybranego punktu pracy obiektu, natomiast regulator korekcyjny, bazujący na informacji na temat różnicy pomiędzy wyjściami modelu i procesu ma postać diagonalnej macierzy wzmocnień. Przedstawione porównanie procesu regulacji pozycji i kąta kursowego statku wiertniczego dla omawianych rozwiązań wskazuje na możliwość wykorzystania układu MFC do sterowania tego typu procesem. Model oraz główna pętla sterowania obliczane są dla nominalnego kąta kursowego, natomiast wyniki uzyskane dla innej wartości tegoż kąta wykazują, że proponowane w pracy rozwiązanie zachowuje dobre właściwości dla znaczącej perturbacji kąta kursowego statku.
    Źródło:
    Pomiary Automatyka Kontrola; 2006, R. 52, nr 11, 11; 25-29
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multivariable Adaptive Controller for the Nonlinear MIMO Model of a Container Ship
    Autorzy:
    Brasel, M.
    Dworak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/117137.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Multi-Input
    Multi-Output (MIMO)
    MIMO System
    MIMO Model
    Container Ship
    Adaptive Controller
    MATLAB
    Nonlinear Model
    Algorithm
    Opis:
    The paper presents an adaptive multivariable control system for a Multi-Input, Multi-Output (MIMO) nonlinear dynamic process. The problems under study are exemplified by a synthesis of a course angle and forward speed control system for the nonlinear four-Degrees-of-Freedom (4-DoF) mathematical model of a single-screw, high-speed container ship. The paper presents the complexity of the assumed model to be analyzed and a synthesis method for the multivariable adaptive modal controller. Due to a strongly nonlinear nature of the ship movements equations a multivariable adaptive controller is tuned in relation to changeable hydrodynamic operating conditions of the ship. In accordance with the given operating conditions controller parameters are chosen on the basis of four measured auxiliary signals. The system synthesis is carried out by linearization of the nonlinear model of the ship at its nominal operating points in the steady-state and by means of a pole placement control method. The final part of the paper includes results of simulation tests of the proposed control system carried out in the MATLAB/Simulink environment along with conclusions and final remarks.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 41-47
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and experimentation of a self-tuning PID control applied to the 3DOF helicopter
    Autorzy:
    Boubakir, A
    Labiod, S.
    Boudjema, F.
    Plestan, F
    Powiązania:
    https://bibliotekanauki.pl/articles/229575.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3-DOF helicopter
    PID control
    adaptive control
    MIMO nonlinear systems
    model-free control
    Opis:
    The paper presents design and experimental validation of a stable self-tuning PID controller for three degrees of freedom (3-DOF) helicopter. At first, it is proposed a self-tuned proportional-integral-derivative (PID) controller for a class of uncertain second order multiinput multi-output nonlinear dynamic systems to which the 3-DOF helicopter dynamic model belongs. Within this scheme, the PID controller is employed to approximate unknown ideal controller that can achieve control objectives. PID controller gains are the adjustable parameters and they are updated online with a stable adaptation mechanism designed to minimize the error between the unknown ideal controller and the used by PID controller. The stability analysis of the closed-loop system is performed using Lyapunov approach. It is proven that all signals in the closed-loop system are uniformly ultimately bounded. The proposed approach can be regarded as a simple and effective model-free control since the mathematical model of the system is assumed unknown. Experimental results are presented to verify the effectiveness of the proposed controller.
    Źródło:
    Archives of Control Sciences; 2013, 23, 3; 311-331
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the theory of λ-matrices based MIMO control system design
    Autorzy:
    Bekhiti, B.
    Dahimene, A.
    Nail, B.
    Hariche, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/206362.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    block roots
    λ-matrices
    decoupling
    MIMO PID compensator
    model matching
    Opis:
    In this paper we have described a new design algorithm for the whole set of latent-structure assignments via the approaches of block structure of λ-matrices placement. The procedure that has been developed is based on decoupling of the interactions between control loops in a multivariable plant. The procedure is performed using matrix polynomial solvent reconstruction for the decoupling purposes. However, for the design of the trajectory tracking controller, each input-output pair is treated respectively by designing SISO controllers. A second procedure is the MIMO PID compensator design via the model-matching method. This latter algorithm has been developed in order to avoid the internal or the hidden instability, which may occur in the first method, due to the block zeros - block poles cancellation.
    Źródło:
    Control and Cybernetics; 2015, 44, 4; 421-442
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beta Fuzzy Logic Systems: Approximation Properties in the mimo Case
    Autorzy:
    Alimi, A. M.
    Hassine, R.
    Selmi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/908193.pdf
    Data publikacji:
    2003
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    informatyka
    beta function
    universal approximation property
    best approximation property
    interpolation property
    Sugeno fuzzy model
    MIMO systems
    Opis:
    Many researches have been interested in the approximation properties of Fuzzy Logic Systems (FLS), which, like neural networks, can be seen as approximation schemes. Almost all of them tackled the Mamdani fuzzy model, which was shown to have many interesting approximation features. However, only in few cases the Sugeno fuzzy model was considered. In this paper, we are interested in the zero-order Multi-Input-Multi-Output (MIMO) Sugeno fuzzy model with Beta membership functions. This leads to Beta Fuzzy Logic Systems (BFLS). We show that BFLSs are universal approximators. We also prove that they possess the best approximation property and the interpolation characteristic.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2003, 13, 2; 225-238
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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