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Wyszukujesz frazę "linear array" wg kryterium: Temat


Wyświetlanie 1-9 z 9
Tytuł:
Estimation of Two Sinusoids in a Very Short Signal
Autorzy:
Rytel-Andrianik, R.
Powiązania:
https://bibliotekanauki.pl/articles/227357.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiple frequencies estimation
short linear array
Opis:
In the paper, the estimation of the parameters (frequency, amplitude, phase) of two complex-valued sinusoids embedded in a white gaussian circular additive noise is considered. In this context, it is answered what is the minimal necessary number of signal samples needed to reliably estimate all the parameters of both sinusoids. The Cramer-Rao bounds and maximum likelihood estimator are used in the analysis. The answer to the posed question is not straightforward. It is shown that three signal samples are enough only if the difference of phases between both sinusoids meets certain condition, otherwise estimation results are ambiguous. The use of four signal samples has the advantage that reliable estimates can be obtained irrespectively of this phase difference.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 2; 123-128
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimum design of non-uniform symmetrical linear antenna arrays using a novel modified invasive weeds optimization
Autorzy:
Kenane, E.
Djahli, F.
Powiązania:
https://bibliotekanauki.pl/articles/140370.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
invasive weeds optimization
non uniform linear array
optimization
synthesis
Opis:
This paper presents a new modified method for the synthesis of non-uniform linear antenna arrays. Based on the recently developed invasive weeds optimization technique (IWO), the modified invasive weeds optimization method (MIWO) uses the mutation process for the calculation of standard deviation (SD). Since the good choice of SD is particularly important in such algorithm, MIWO uses new values of this parameter to optimize the spacing between the array elements, which can improve the overall efficiency of the classical IWO method in terms of side lobe level (SLL) suppression and nulls control. Numerical examples are presented and compared to the existing array designs found in the literature, such as ant colony optimization (ACO), particle swarm optimization (PSO), and comprehensive learning PSO (CLPSO). Results show that MIWO method can be a good alternative in the design of non-uniform linear antenna array.
Źródło:
Archives of Electrical Engineering; 2016, 65, 1; 5-18
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear and Planar Array Pattern Nulling via Compressed Sensing
Autorzy:
Mohammed, Jafar Ramadhan
Thaher, Raad H.
Abdulqader, Ahmed Jameel
Powiązania:
https://bibliotekanauki.pl/articles/1839322.pdf
Data publikacji:
2021
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
compressed sensing
convex optimization
iterative re-weighted l1- norm minimization
linear array
planar array
Opis:
An optimization method based on compressed sensing is proposed for uniformly excited linear or planar antenna arrays to perturb excitation of the minimum number of array elements in such a way that the required number of nulls is obtained. First, the spares theory is relied upon to formulate the problem and then the convex optimization approach is adopted to find the optimum solution. The optimization process is further developed by using iterative re-weighted l1- norm minimization, helping select the least number of the sparse elements and impose the required constraints on the array radiation pattern. Furthermore, the nulls generated are wide enough to cancel a whole specific sidelobe. Simulation results demonstrate the effectiveness of the proposed method and the required nulls are placed with a minimum number of perturbed elements. Thus, in practical implementations of the proposed method, a highly limited number of attenuators and phase shifters is required compared to other, conventional methods.
Źródło:
Journal of Telecommunications and Information Technology; 2021, 3; 50-55
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unequally Spaced Antenna Array Synthesis Using Accelerating Gaussian Mutated Cat Swarm Optimization
Autorzy:
Kumar, Prasanna K.
Pappula, Lakshman
Madhav, B. T. P.
Prabhakar, V. S. V.
Powiązania:
https://bibliotekanauki.pl/articles/2058505.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
Gaussian mutation
cat swarm optimization
linear antenna array
PSLL
Opis:
Low peak sidelobe level (PSLL) and antenna arrays with high directivity are needed nowadays for reliable wireless communication systems. Controlling the PSLL is a major is sue in designing effective antenna array systems. In this paper, a nature inspired technique, namely accelerating Gaussian mutated cat swarm optimization (AGMCSO) that attributes global search abilities, is proposed to control PSLL in the radiation pattern. In AGM-SCO, Gaussian mutation with an acceleration parameter is used in the position-updated equa tion, which allows the algorithm to search in a systematic way to prevent premature convergence and to enhance the speed of convergence. Experiments concerning several benchmark multimodal problems have been conducted and the obtained results illustrate that AGMCSO shows excellent performance concerning evolutionary speed and accuracy. To validate the overall efficacy of the algorithm, a sensitivity analysis was per formed for different AGMCSO parameters. AGMCSO was researched on numerous linear, unequally spaced antenna ar rays and the results show that in terms of generating low PSLL with a narrow first null beamwidth (FNBW), AGMCSO out performs conventional algorithms.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 99--109
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Failure Correction of Flattop and Cosecant Squared Beam Patterns in Linear Antenna Arrays
Autorzy:
Patidar, H.
Mahanti, G. K.
Muralidharan, R.
Powiązania:
https://bibliotekanauki.pl/articles/308727.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cosecant squared pattern
failure correction
firefly algorithm
flattop beam pattern
linear array
side lobe level
Opis:
This paper deals with the synthesis of flattop and cosecant squared beam patterns using the firefly algorithm which is based on metaheuristics. This synthesis is followed by the correction of the radiation patterns when unfortunate malfunctioning of the individual elements in the array occurs. The necessary attention is given to the recovery process, with due emphasis on reduction of side lobe level, ripple and the reflection coefficient. Simulation in Matlab shows a successful employment of the firefly algorithm in producing voltage excitations of the good elements necessary for the recovered patterns. The performance of the firefly algorithm in failure correction is validated by duly comparing it with a standard benchmark.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 4; 25-30
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Suppressing Side-Lobes of Linear Phased Array of Micro-Strip Antennas with Simulation-Based Optimization
Autorzy:
Kozieł, S.
Ogurtsov, S.
Bekasiewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/220985.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
linear antenna array
micro-strip antenna array
phased antenna array
antenna optimization
antenna array optimization
simulation-based optimization
surrogate model
Opis:
A simulation-based optimization approach to design of phase excitation tapers for linear phased antenna arrays is presented. The design optimization process is accelerated by means of Surrogate-Based Optimization (SBO); it uses a coarse-mesh surrogate of the array element for adjusting the array’s active reflection coefficient responses and a fast surrogate of the antenna array radiation pattern. The primary optimization objective is to minimize side-lobes in the principal plane of the radiation pattern while scanning the main beam. The optimization outcome is a set of element phase excitation tapers versus the scan angle. The design objectives are evaluated at the high fidelity level of description using simulations of the discrete electromagnetic model of the entire array so that the effects of element coupling and other possible interaction within the array structure are accounted for. At the same time, the optimization process is fast due to SBO. Performance and numerical cost of the approach are demonstrated by optimizing a 16-element linear array of microstrip antennas. Experimental verification has been carried out for a manufactured prototype of the optimized array. It demonstrates good agreement between the radiation patterns obtained from simulations and from physical measurements (the latter constructed through superposition of the measured element patterns).
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 193-203
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction in the number of LUT elements for control units with code sharing
Autorzy:
Barkalov, A.
Titarenko, L.
Bieganowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/908135.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mikroprogramowany układ sterujący
współdzielenie kodów
układ programowalny
tablica przeglądowa
field programmable gate array (FPGA)
lookup table
design
Embedded Memory Block
compositional microprogram control unit (CMCU)
code sharing
operational linear chain
Opis:
Two methods are proposed targeted at reduction in the number of look-up table elements in logic circuits of compositional microprogram control units (CMCUs) with code sharing. The methods assume the application of field-programmable gate arrays for the implementation of the combinational part of the CMCU, whereas embedded-memory blocks are used for implementation of its control memory. Both methods are based on the existence of classes of pseudoequivalent operational linear chains in a microprogram to be implemented. Conditions for the application of the proposed methods and examples of design are shown. Results of conducted experiments are given.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2010, 20, 4; 751-761
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie liniowych rejestrów pierścieniowych do testowania połączeń w układach FPGA
On Application of Ring Linear Feedback Shift Registers to Testing of Interconnects in FPGAs
Autorzy:
Hławiczka, A.
Gucwa, K.
Garbolino, T.
Powiązania:
https://bibliotekanauki.pl/articles/156314.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
liniowy rejestr pierścieniowy
testowanie połączeń
lokalizacja uszkodzeń
identyfikacja uszkodzeń
sygnatura
słownik diagnostyczny
układ FPGA
ring linear feedback shift register
interconnect testing
fault localization
fault identification
signature
fault dictionary
field programmable gate array (FPGA)
Opis:
Praca poświęcona jest dedykowanemu konkretnej aplikacji testowaniu połączeń w układach FPGA. Na czas testowania komórki układu FPGA wchodzące w skład realizowanej aplikacji są przekształcane w elementy układu RL-BIST. Do budowy takiego układu został wybrany pierścieniowy rejestr LFSR, którego n pętli sprzężeń zwrotnych jest w trakcie testowania liniami testowanej magistrali połączeń. Na podstawie sygnatury otrzymanej w układzie RL-BIST stwierdza się czy testowana magistrala połączeń jest sprawna a w oparciu o słownik diagnostyczny można także zlokalizować uszkodzone połączenia oraz zidentyfikować typ uszkodzenia. Skuteczność zaproponowanej metody testowania połączeń w FPGA została poparta obszernymi wynikami eksperymentalnymi.
Due to rapidly growing complexity of FPGA circuits application-dependent techniques of their testing become more and more often exploited for manufacturing test instead of application'independent methods. In such the case not all but only a part of FPGA resources (i.e. CLBs and interconnects) is a subject of testing - the part that is to be used by the concrete target application. The work is devoted to application-dependent testing of interconnects in FPGA circuits. For the test period the CLBs being the parts of the application are reconfigured so they implement elements (i.e. XOR gates and D-type flip-flops) of a RL-BIST structure based on a ring linear feedback shift register (R-LFSR). FPGA interconnections under test (IUTs) or at least their part are feedback lines of the R-LFSR. The R-LFSR is first initialised with a randomly chosen seed and than run for several clock cycles. Next the final state of the R-LFSR - a signature - is red by an ATE (Automatic Test Equipment). The value of the signature determines whether IUTs are fault free or faulty. Moreover, on the basis of the signature and with the use of a fault dictionary one may localise faulty interconnections in the FPGA and identify types of faults. The FPGA is afterwards reconfigured so the other set of IUTs becomes feedback lines of the R-LFSR. The above procedure is repeated until all FPGA interconnections belonging to the target application are tested. Efficacy of the proposed approach to testing of FPGA interconnects is supported by experimental results.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 8, 8; 594-597
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mikroprogramowany układ sterujący z współdzieleniem kodów oraz mikroinstrukcjami sterującymi
Compositional microprogram control unit with code sharing and control microinstructions
Autorzy:
Barkalov, A.
Titarenko, L.
Bieganowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/154793.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mikroprogramowany układ sterujący
współdzielenie kodów
łańcuch bloków operacyjnych
tabela LUT
osadzony blok pamięci
compositional microprogram control unit (CMCU)
code sharing
operational linear chain
field programmable gate array (FPGA)
lookup table
design
Embedded Memory Block
Opis:
W artykule przedstawiona została metoda syntezy umożliwiająca zmniejszenie liczby tablic LUT potrzebnych do realizacji układu mikroprogramowanego z współdzieleniem kodów. Metoda jest przeznaczona dla układów FPGA z osadzonymi blokami pamięci. Część kombinacyjna układu mikroprogramowanego jest realizowana z użyciem tablic LUT, natomiast pamięć sterująca z użyciem osadzonych bloków pamięci. Redukcję liczby tablic LUT osiągnięto dzięki wykorzystaniu klas łańcuchów pseudorównoważnych. W artykule przedstawiono przykład zastosowania proponowanej metody oraz rezultaty eksperymentów.
The paper presents new research results of synthesis of Composi-tional Microprogram Control Unit (CMCU) with Codes Sharing. The method allows reduction of look-up table elements in the combina-tional part of the control unit. The method assumes application of field-programmable gate arrays for implementation of the combinational part, whereas embedded-memory blocks are used for implementation of its control memory. Programmable logic devices are nowadays widely used for implementation of Control Units (CU) [16, 18]. The problem of the CU optimisation is still actual in computer science and it solution permits to decrease the cost of the system [17]. The proposed method is oriented on reduction of hardware amount of CMCU addressing circuit by placing codes of classes of pseudoequivalent states in the control memory. These classes are formed by division of the set of Operational Linear Chains (OLC) into partitions which correspond to pseudoequivalent states of Moore FSM [4]. The research results show that application of the method to tested control algorithms gives on average 50% decrease in hardware amount when compared to CMCU based structure (Tab. 2). The results were obtained using Xilinx ISE. The models of control units were generated by the authors' software using the control algorithms from [15].
Źródło:
Pomiary Automatyka Kontrola; 2010, R. 56, nr 7, 7; 780-783
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-9 z 9

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