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    Wyświetlanie 1-15 z 15
    Tytuł:
    Using Least Mean p-Power Algorithm to Correct Channel Distortion in MC-CDMA Systems
    Autorzy:
    Zidane, M.
    Safi, S.
    Sabri, M.
    Frikel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308275.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    adaptive equalization
    adaptive identification
    BER
    BRAN C
    LMP
    MC-CDMA system
    ZF
    Opis:
    This work focuses on adaptive Broadband Radio Access Network (BRAN) channel identification and on downlink Multi-Carrier Code Division Multiple Access (MCCDMA) equalization. We use the normalized BRAN C channel model for 4G mobile communications, distinguishing between indoor and outdoor scenarios. On the one hand, BRAN C channel parameters are identified using the Least Mean p-Power (LMP) algorithm. On the other, we consider these coefficients in the context of adaptive equalization. We provide an overview and a mathematic formulation of MC-CDMA systems. According to these fundamental concepts, the equalizer technique is investigated analytically to compensate for channel distortion in terms of the bit error rate (BER). The numerical simulation results, for various signal-to-noise ratios and different p threshold, show that the presented algorithm is able to simulate the BRAN C channel measured with different accuracy levels. Furthermore, as far as the adaptive equalization problem is concerned, the results obtained using the zero-forcing equalizer demonstrate that the algorithm is adequate for some particular cases of threshold p.
    Źródło:
    Journal of Telecommunications and Information Technology; 2018, 3; 23-30
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pole - Placement Adaptive Control for a Plant with Unknown Structure and Parameters - a Simulation Study
    Autorzy:
    Horla, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/384688.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    adaptive control
    identification
    Opis:
    Adaptive pole-placement control for the plant with unknown orders and coefficients of its model is presented in the paper, in an on-line approach. In order to adapt to the plant, the considered controller changes its structure and parameters, along with the identification process. In order to combine structural and parametric identification, the approach presented in [5] has been used, with the simulation runs performed for continuous plant and a discrete-time controller and identification algorithms.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 1; 28-32
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive Automatic System of Controlling Acceleration Characteristics of Electromechanical Converters with an Observing Identification Tool
    Autorzy:
    Kalabayeva, Aidana
    Wójcik, Waldemar
    Kashaganova, Gulzhan
    Togzhanova, Kulzhan
    Sarybayeva, Zhaksygu
    Powiązania:
    https://bibliotekanauki.pl/articles/27311924.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    electromechanical converters
    adaptive system
    control systems
    identification
    Opis:
    The operating modes of the automatic control system for electromechanical converters for synchronization of rotor speeds have been developed and investigated. The proposed automatic speed control system allows adjusting the slave engine to the master one in a wide range from 0 to 6000 rpm. To improve the synchronization accuracy an adaptive algorithm is proposed that allows to increase the synchronization accuracy by 3-4 times. The proposed model of an adaptive automatic control system with an observing identification tool makes it possible to minimize the error in the asynchrony of the rotation of the rotors of two electromechanical converters.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 615--620
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Novel Kernel Algorithm for Finite Impulse Response Channel Identification
    Autorzy:
    Fateh, Rachid
    Darif, Anouar
    Boumezzough, Ahmed
    Safi, Said
    Frikel, Miloud
    Powiązania:
    https://bibliotekanauki.pl/articles/24200741.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    finite impulse response
    kernel adaptive filtering
    kernel recursive projection identification
    nonlinear system identification
    Opis:
    Over the last few years, kernel adaptive filters have gained in importance as the kernel trick started to be used in classic linear adaptive filters in order to address various regression and time-series prediction issues in nonlinear environments.In this paper, we study a recursive method for identifying finite impulse response (FIR) nonlinear systems based on binary-value observation systems. We also apply the kernel trick to the recursive projection (RP) algorithm, yielding a novel recursive algorithm based on a positive definite kernel. For purposes, our approach is compared with the recursive projection (RP) algorithm in the process of identifying the parameters of two channels, with the first of them being a frequency-selective fading channel, called a broadband radio access network (BRAN B) channel, and the other being a a theoretical frequency-selective channel, known as the Macchi channel. Monte Carlo simulation results are presented to show the performance of the proposed algorithm.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 84--93
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability Conditions for the Leaky LMS Algorithm Based on Control Theory Analysis
    Autorzy:
    Bismor, D.
    Pawelczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177088.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adaptive filtering
    leaky LMS
    stability
    negative step size
    identification
    adaptive line enhancer
    active noise control
    Opis:
    The Least Mean Square (LMS) algorithm and its variants are currently the most frequently used adaptation algorithms; therefore, it is desirable to understand them thoroughly from both theoretical and practical points of view. One of the main aspects studied in the literature is the influence of the step size on stability or convergence of LMS-based algorithms. Different publications provide different stability upper bounds, but a lower bound is always set to zero. However, they are mostly based on statistical analysis. In this paper we show, by means of control theoretic analysis confirmed by simulations, that for the leaky LMS algorithm, a small negative step size is allowed. Moreover, the control theoretic approach alows to minimize the number of assumptions necessary to prove the new condition. Thus, although a positive step size is fully justified for practical applications since it reduces the mean-square error, knowledge about an allowed small negative step size is important from a cognitive point of view.
    Źródło:
    Archives of Acoustics; 2016, 41, 4; 731-739
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the method of the nonparametric identification of nonlinear dynamic control objects for the crushed vulcanization modification
    Autorzy:
    Fursa, O.
    Gyrenko, A.
    Cheremysinova, A.
    Sheikus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/411013.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    control object
    identification
    adaptive control system
    crushed vulcanized rubber
    modification
    Opis:
    Solving a problem of building the automatic control system of the industrial rubber article technological process by means of modeling software is one of the essential parts of providing the technological effectiveness. The work concerns the problem of application of the method of the nonparametric identification of a nonlinear dynamic control object for the process of modification of crushed vulcanized rubber. This process is an explicit nonlinear and nonstationary system of control parameters. The application of this method allows to obtain reliable information on an object without difficult computation, and the reliability of the method is corroborated graphically and with the computation. Depending on the degree of complexity of an object this method can be deterministic or probabilistic, can describe only time development, only spatial development or time-spatial development of an object. The influence of the process type on the identification results was analyzed in the work. Therefore, the task of increasing the quickness of information selection about the object is still a topical problem for the non-parametric identification. Conclusions about a possibility of activation of the identification procedure were made. The elaborated algorithm allows to apply it for other technological processes with self-adjusting systems when the condition of quasi-stationarity is fulfilled.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 4; 17-22
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On-line process identification using the Modulating Functions Method and non-asymptotic state estimation
    Autorzy:
    Byrski, Witold
    Drapała, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2175109.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    system identification
    modulating functions method
    state observers
    signal processing
    adaptive algorithms
    Opis:
    The paper presents an iterative identification method dedicated for industrial processes. The method consists of two steps. In the first step, a MISO system is identified with the Modulating Functions Method to obtain sub-models with a common denominator. In the second step, the obtained subsystems are re-identified. This procedure enables to obtain the set of models with different denominators of the transfer functions. The algorithm was used for on-line identification of a glass conditioning process. Identification window is divided into intervals, in which the models can be updated based on recent process data, with the use of the integral state observer. Results of the performed simulations for the identified models are compared with the historical process data.
    Źródło:
    Archives of Control Sciences; 2022, 32, 3; 535--555
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of the Oscillation Period of Chemical Reactors by Chaotic Sampling of the Conversion Degree
    Autorzy:
    Lawnik, M.
    Berezowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185723.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reaktor chemiczny
    adaptacyjne próbkowania
    identyfikacja sygnału
    chemical reactor
    adaptive sampling
    signal identification
    Opis:
    To stabilise the periodic operation of a chemical reactor the oscillation period should be determined precisely in real time. The method discussed in the paper is based on adaptive sampling of the state variable with the use of chaotic mapping to itself. It enables precise determination of the oscillation period in real time and could be used for a proper control system, that can successfully control the process of chemical reaction and maintain the oscillation period at a set level. The method was applied to a tank reactor and tubular reactor with recycle.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 3; 387-393
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LMS Algorithm Step Size Adjustment for Fast Convergence
    Autorzy:
    Bismor, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177252.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    adaptive algorithms
    least mean squares
    active noise control
    system identification
    Opis:
    In the areas of acoustic research or applications that deal with not-precisely-known or variable condi- tions, a method of adaptation to the uncertainness or changes is usually necessary. When searching for an adaptation algorithm, it is hard to overlook the least mean squares (LMS) algorithm. Its simplicity, speed of computation, and robustness has won it a wide area of applications: from telecommunication, through acoustics and vibration, to seismology. The algorithm, however, still lacks a full theoretical analysis. This is probabely the cause of its main drawback: the need of a careful choice of the step size – which is the reason why so many variable step size flavors of the LMS algorithm has been developed. This paper contributes to both the above mentioned characteristics of the LMS algorithm. First, it shows a derivation of a new necessary condition for the LMS algorithm convergence. The condition, although weak, proved useful in developing a new variable step size LMS algorithm which appeared to be quite different from the algorithms known from the literature. Moreover, the algorithm proved to be effective in both simulations and laboratory experiments, covering two possible applications: adaptive line enhancement and active noise control.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 31-40
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptacyjny układ stabilizacji kursu statku
    An Adaptive System of Ship Course Stabilization
    Autorzy:
    Zwierzewicz, Z.
    Borkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/359765.pdf
    Data publikacji:
    2004
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    sterowanie adaptacyjne
    identyfikacja modelu
    regulator optymalny LQR
    EXPLO-SHIP 2004
    adaptive control
    model identification
    LQR controller
    Opis:
    Zaprojektowano adaptacyjny układ stabilizacji kursu statku, opierając się na mode-lu Nomoto. Jako algorytm sterowania przyjęto regulator optymalny LQR, natomiast identyfikacji modelu dokonano na podstawie "ciągłą wersję" metody najmniejszych kwadratów. Jakość działania systemu sprawdzono symulacyjnie, używając jako modelu rzeczywistego statku nieliniowego modelu de Witt-Oppe'go.
    The paper presents a design of an adaptive system of ship course stabilization based on Nomoto's model. As a control algorithm the LQR control was adopted,whereas the model identification is performed on the basis of 'continuous version' of the least-squares algorithm. The performance of the system operation was simulated using a de Witt-Oppe nonlinear model as a real ship model.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2004, 2 (74); 431-442
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fuzzy adaptive control of a class of MISO nonlinear systems
    Autorzy:
    Lagrat, I.
    Ouakka, H.
    Boutnhidi, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/971004.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    identyfikacja
    sterowanie adaptacyjne
    układ nieliniowy
    MISO systems
    identification
    fuzzy clustering
    Takagi-Sugeno fuzzy model
    adaptive control
    nonlinear system
    Opis:
    This paper presents a fuzzy adaptive control of a class of MISO nonlinear systems. The dynamic behaviour of each MISO systems is composed of a nonlinear term, interactions effect between the inputs, and disturbances. In these circumstances, adaptive control becomes very difficult to implement and not always an evident task. Thus, the MISO system is approximated by the Takagi-Sugeno fuzzy model. The advantage of this approximation is beneficial in the sense that it allows for converting the nonlinear problem into a linear one. In this respect, the coupling, nonlinearity and unmodeled dynamics are easily compensated. The identification and the control are conducted at the level of each local linear model based on fuzzy approach. The computational load and the complexity of nonlinear approach are reduced and permit wide applicability. The validity and the performance are tested numerically.
    Źródło:
    Control and Cybernetics; 2008, 37, 1; 177-190
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Specific emitter identification using geometric features of frequency drift curve
    Autorzy:
    Zhao, Y.
    Wui, L.
    Zhang, J.
    Li, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/200575.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    specific emitter identification
    geometric features
    frequency drift
    adaptive fractional spectrogram
    support vector machine
    emiter
    cechy geometryczne
    dryf częstotliwości
    spektrogram
    Opis:
    Specific emitter identification (SEI) is a technique for recognizing different emitters of the same type which have the same modulation parameters. Using only the classic modulation parameters for recognition, one cannot distinguish different emitters of a same type. To solve the problem, new features urgently need to be developed for recognition. This paper focuses on the common phenomenon of frequency drift, defines geometric features of frequency drift curve and, finally, proposes a practical algorithm of specific emitter identification using the geometric features. The proposed algorithm consists of three processes: instantaneous frequency estimation based on the adaptive fractional spectrogram, feature extraction of frequency drift curve based on geometric methods for describing a curve and recognition process based on support vector machine. Simulation results show that the identification rate is generally more than 98% above –5 dB of signal to noise ratio (SNR), and real data experiment verifies the practical performance of the proposed algorithm.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 99-108
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive control through on-line optimization. The MPCI paradigm and variants
    Autorzy:
    Nikolaou, M.
    Eker, S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/908314.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie adaptacyjne
    sterowanie predykcyjne
    wzbudzanie trwałe
    adaptive control
    model predictive control
    closed-loop identification
    persistent excitation
    linear matrix inequalities
    semidefinite programming
    Opis:
    A new variant of Model Predictive Control and Identification (MPCI) is proposed. The on-line objective is not to minimize the sum of square errors, but to maximize on-line the sum of the lower bounds on the minimum eigenvalues of the information matrices over finite horizons. In that way, inputs to the controlled process are allowed to excite the process highly enough to generate as much modelling information as possible, while the process goes off-spec as little as possible. Constraints can be loosened or tightened according to the need for identification. The effectiveness of the proposed new methodology is illustrated through a number of simulations.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 1; 25-52
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie regulatora typu MPC do sterowania procesem suszenia konwekcyjnego
    Using of the MPC type controller for convection rying process control
    Autorzy:
    Tomkiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/290820.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    wilgotność
    ziarno
    sterowanie adaptacyjne
    suszenie
    identyfikacja
    regulator MPC
    Model Predictive Control
    grain
    adaptive control
    drying
    identification
    humidity
    MPC controller
    model predictive control
    Opis:
    W artykule zostały zaprezentowane badania związane z zastosowaniem regulatora MPC (Model Predictive Control) do sterowania procesem suszenia konwekcyjnego. Związek pomiędzy natężeniem wypływu materiału suszonego a wilgotnością zboża i innymi mierzonymi parametrami jest określony za pomocą hybrydowego modelu składającego się z równania różniczkowego cząstkowego i sieci neuronowej. Sieć neuronowa zapewnia uwzględnienie nieliniowości związanych z dynamiką procesu suszenia. Wagi sieci estymowane są w czasie rzeczywistym przy użyciu algorytmu rozszerzonego filtru Kalmana. Pozwala to na samoczynne adaptowanie się modelu do zmieniających się warunków procesu oraz rodzaju suszonego materiału.
    The article presents studies on the application of the MPC (Model Predictive Control) controller to operate convection drying process. The relationship between outflow rate of dried material and corn moisture content and other measured parameters is determined using a hybrid model consisting of partial differential equation and a neural network. The neural network ensures taking into consideration nonlinearities connected with drying process dynamics. Network weights are estimated in real time using extended algorithm of the Kalman filter. This allows the model to adapt automatically to changing process conditions and dried material type.
    Źródło:
    Inżynieria Rolnicza; 2008, R. 12, nr 5(103), 5(103); 345-352
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model identification and update under operation of active noise control systems
    Identyfikacja i uaktualnianie modeli w trakcie pracy układów aktywnego tłumienia hałasu
    Autorzy:
    Figwer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/151819.pdf
    Data publikacji:
    2003
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    układy aktywnego tłumienia hałasu
    tłumienie hałasu
    identyfikacja modeli
    uaktualnianie modeli
    active noise control
    system identification
    adaptive systems
    frequency response
    fast Fourier transform
    Opis:
    In the paper, a new look at on-line electro-acoustic plant model identification and update for feedforward active noise control (ANC) systems under their operation is presented. The problem of on-line electro-acoustic plant model identification under active ANC system is discussed as a closed-loop identification problem with a low signal-to-noise ratio. The feedback is introduced by an adaptation algorithm. Additionally it may be also implied by an acoustic interaction between a control loudspeaker and reference microphone. In ANC literature concerning on-line electro-acoustic plant modelling it is proposed to identify electro-acoustic plant models together with the feedback. It leads to biased and inconsistent identification results. In the paper, an approach to this problem that gives results converging asymptotically to true electro-acoustic plant models is presented.
    W pracy zaprezentowano nowe spojrzenie na problem identyfikacji on-line modeli torów elektroakustycznych w adaptacyjnych kompensacyjnych układach aktywnego tłumienia hałasu (ATH). Problem ten dyskutowany jest jako problem identyfikacji obiektu pracującego w układzie ze sprzężeniem zwrotnym przy niskim stosunku sygnału do szumu. Sprzężenie to wprowadzane jest w układach ATH poprzez algorytm adaptacji. Może być ono również wynikiem akustycznej interakcji głośnika sterującego z mikrofonem błędu. W literaturze poświęconej aktywnemu tłumieniu hałasu proponuje się, by w trakcie pracy układów ATH identyfikować modele torów elektroakustycznych wraz ze wspomnianym sprzężeniem zwrotnym. Otrzymane w ten sposób oceny parametrów modeli torów elektroakustycznych są obciążone. W artykule zaproponowano nową metodę identyfikacji tych modeli. Metoda ta pozwala uzyskać asymptotycznie nieobciążone i zgodne oceny parametrów modeli torów elektroakustycznych.
    Źródło:
    Pomiary Automatyka Kontrola; 2003, R. 49, nr 11, 11; 22-25
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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