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    Wyświetlanie 1-32 z 32
    Tytuł:
    A High-Efficient Low-Voltage Rectifier for CMOS Technology
    Autorzy:
    Jendernalik, W.
    Jakusz, J.
    Blakiewicz, G.
    Kłosowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220356.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CMOS rectifier
    high frequency rectifier
    wireless power transmission
    Opis:
    A new configuration of rectifier suiting CMOS technology is presented. The rectifier consists of only two n-channel MOS transistors, two capacitors and two resistors; for this reason it is very favourable in manufacturing in CMOS technology. With these features the rectifier is easy to design and cheap in production. Despite its simplicity, the rectifier has relatively good characteristics, the voltage and power efficiency, and bandwidth greater than 89%, 87%, and 1 GHz, respectively. The performed simulations and measurements of a prototype circuit fully confirmed its correct operation and advantages.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 2; 261-268
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance Study of Solar Power Source for Wireless Systems
    Autorzy:
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/225988.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaics
    renewable energy
    solar irradiation
    wireless power systems
    Opis:
    Photovoltaic (PV) technology is an attractive power source for systems with no wired connections to any network. Because of seasonal variations of solar irradiation, designing such a system requires careful analysis in order to provide required level of reliability. In this paper we present results of 16-month measurements of experimental PV system located in Poland. Obtained irradiation values have been verified with reference data from independent sources. The results of this work may be helpful in forecasting the performance of similar PV systems in the same region and allow to make more precise forecasts of power system performance than based only on average monthly irradiation tables.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 3; 271-276
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonance phenomena in wireless power supply systems
    Autorzy:
    Filipiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97297.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    wireless power supply
    q–factor
    system performance
    inductance compensation
    Opis:
    The article presents the prospects for application of wireless power supply in electronic devices. A short description of advantages of using this technology including the principle of its operation and construction of typical systems applied in devices of everyday use was provided. Two types of resonance systems used for wireless transmission of energy were presented. Also, advantages and disadvantages of using each of these systems were listed. Furthermore, the impedance and performance analyses of the wireless electric energy transmission systems were discussed. The performance characteristics were presented depending on several parameters in the three–dimensional form. The minimum quality factor of the resonance system, which allows the achievement of the high system performance at low interface between the primary and secondary coil winding was demonstrated. Two tested circuits were compared and the areas of application were determined for each of them. Difficulties related to maintenance of the circuit in resonance and to limitation of losses were determined.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 127-137
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A multi-coil wireless power transfer (MC-WPT) system - analysis method and properties
    Autorzy:
    Kaczmarczyk, Z.
    Bodzek, K.
    Ruszczyk, A.
    Kasprzak, M.
    Domoracki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114244.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wireless power transfer
    magnetically coupled coils
    resonant circuits
    optimization
    Opis:
    The paper is devoted to some problems of multi-coil wireless power transfer (MC-WPT) systems. It is well known that the effective gap for MC-WPT systems can be extended for relatively long distances preserving high efficiency. The paper is organized as follows. In Section 2, the system is described by a matrix model. This model is prepared to determine system properties. In Section 3, the optimization procedure which allows improving the system performance at the desired operating point is introduced. Section 4 contains the results of experimental verification. Moreover, the paper presents an interesting phenomenon of the current unbalance among the system coils.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 10; 480-483
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Review of Methods and Challenges for Improvement in Efficiency and Distance for Wireless Power Transfer Applications
    Autorzy:
    Kuka, Sokol
    Ni, Kai
    Alkahtani, Mohammed
    Powiązania:
    https://bibliotekanauki.pl/articles/1193899.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wireless power transfer
    inductive power transfer technique
    efficiency
    distance
    safety
    security
    Opis:
    Over the past few years, interest and research in wireless power transfer (WPT) have been rapidly incrementing, and as an effect, this is a remarkable technology in many electronic devices, electric vehicles and medical devices. However, most of the applications have been limited to very close distances because of efficiency concerns. Even though the inductive power transfer technique is becoming relatively mature, it has not shown near-field results more than a few metres away transmission. This review is focused on two fundamental aspects: the power efficiency and the transmission distance in WPT systems. Introducing the principles and the boundaries, scientific articles will be reviewed and discussed in terms of their methods and respective challenges. This paper also shows more important results in efficiency and distance obtained, clearly explaining the theory behind and obstacles to overcome. Furthermore, an overlook in other aspects and the latest research studies for this technology will be given. Moreover, new issues have been raised including safety and security.
    Źródło:
    Power Electronics and Drives; 2020, 5, 40; 1-25
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Efficient Inductive Coil Link Design for Wireless Power Transfer to Visual Prostheses
    Autorzy:
    Celik, M.
    Aydin, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031436.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    wireless power transfer
    inductive link
    magnetic field
    telemetry
    visual prosthesis
    Opis:
    Powering therapeutic devices plays a crucial role in the design phase of implantable electronic units. Batteries could not provide sufficient charge storage, used for the lifetime of the device, considering the space available for them. As sophisticated surgical procedures are required with the possible trauma to the patient such as material discrepancy and tissue damage, replacement is quite risky and not an option. Thus, therapeutic devices, especially visual prostheses, receive power wirelessly through inductive coil links which are connected to a battery outside the body. An inductive link is based on the main principle that there are two components such as primary and secondary units. Although primary unit includes the battery outside the body, power transmitter, and control unit, secondary unit under the skin contains amplifier, rectifier regulators, and power control unit. In this study, an inductive coil link is modelled to evaluate fundamental design specifications for visual prostheses. Inductive coil link parameters are quantitatively investigated so that maximum power transfer efficiency and miniaturization, which are critically important for electronics placed in intraocular region, are provided. Considering 20 mm distance, it is concluded that the separation and the size of the coil pair, loop diameter, frequency have a major role to determine the system performance.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 535-537
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust H∞ output feedback control of bidirectional inductive power transfer systems
    Autorzy:
    Swain, A.
    Almakhles, D.
    Neath, M. J.
    Nasiri, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/230097.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inductive power transfer
    wireless power transfer
    robust control
    linear matrix inequalities
    sensitivity analysis
    Opis:
    Bidirectional Inductive power transfer (IPT) systems behave as high order resonant networks and hence are highly sensitive to changes in system parameters. Traditional PID controllers often fail to maintain satisfactory power regulation in the presence of parametric uncertainties. To overcome these problems, this paper proposes a robust controller which is designed using linear matrix inequality (LMI) techniques. The output sensitivity to parametric uncertainty is explored and a linear fractional transformation of the nominal model and its uncertainty is discussed to generate a standard configuration for μ-synthesis and LMI analysis. An H∞ controller is designed based on the structured singular value and LMI feasibility analysis with regard to uncertainties in the primary tuning capacitance, the primary and pickup inductors and the mutual inductance. Robust stability and robust performance of the system is studied through μ-synthesis and LMI feasibility analysis. Simulations and experiments are conducted to verify the power regulation performance of the proposed controller.
    Źródło:
    Archives of Control Sciences; 2017, 27, 1; 41-62
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System identification and tuning of wireless power transfer systems with multiple magnetically coupled resonators
    Autorzy:
    Winges, J.
    Rylander, T.
    Petersson, C.
    Ekman, C.
    Johansson, L.-Å.
    McKelvey, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/136270.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    wireless power transfer
    magnetically coupled resonators
    system identification
    tuning
    Bayesian estimation
    impedance matching
    charging electric vehicles
    Opis:
    We present a procedure for system identification and tuning of a wireless power transfer (WPT) system with four magnetically coupled resonators, where each resonator consists of a coil and a capacitor bank. The system-identification procedure involves three main steps: 1) individual measurement of the capacitor banks in the system; 2) measurement of the frequency-dependent two-port impedance matrix of the magnetically coupled resonators; and 3) determining the inductance of all coils and their corresponding coupling coefficients using a Bayesian approach. The Bayesian approach involves solving an optimization problem where we minimize the mismatch between the measured and simulated impedance matrix together with a penalization term that incorporates information from a direct measurement procedure of the inductance and losses of the coils. This identification procedure yields an accurate system model which we use to tune the four capacitance values to recover high system-performance and account for, e.g., manufacturing tolerances and coil displacement. For a prototype WPT system, we achieve 3.3 kW power transfer with 91% system efficiency over an air-gap distance of approximately 20 cm.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 86-92
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    RF energy harvesting for low power electronic devices: student project
    Autorzy:
    Mihaylov, K
    Powiązania:
    https://bibliotekanauki.pl/articles/397947.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    wireless power
    RF energy harvesting
    small loop antenna
    zasilanie bezprzewodowe
    RF
    energia wysokiej częstotliwości
    antena magnetyczna
    Opis:
    Different methods for RF energy harvesting from radio transmitters with working frequency of up to 108 MHz are examined. Experiments are conducted especially with the LW transmitter near Vakarel village (261 kHz) (Sofia, Bulgaria) and the transmitter of the National Radio “HristoBotev” at radio- tower “Kopitoto” (92. 9 MHz) (Sofia, Bulgaria). Partial success is achieved with electrically small loop antenna resonated at 261 kHz.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2014, 5, 1; 41-45
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reducing the Use of Electrochemical Sources of Electricity Through the Use of Wireless Power Supply
    Ograniczenie wykorzystania elektrochemicznych źródeł energii elektrycznej poprzez zastosowanie zasilania bezprzewodowego
    Autorzy:
    Jajczyk, Jarosław
    Filipiak, Michał
    Dąbrowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1811557.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    electrochemical energy storage
    recycling of batteries
    recycling of accumulators
    wireless power supply
    Qi Wireless Charging standard
    elektrochemiczny zasobnik energii
    recykling baterii
    recykling akumulatorów
    zasilanie bezprzewodowe
    standard Qi Wireless Charging
    Opis:
    The paper discusses issues related to the recycling of electrochemical sources of electricity such as portable batteries and accumulators. Based on the reports of the Chief Inspectorate of Environmental Protection, the collection rate of waste batteries and accumulators in Poland for the years 2010-2018 was subjected to analysis. Despite the increasing year-to-year percentage value of the collection rate, it has been demonstrated that a significant mass of batteries and accumulators is still not recycled. This article presents a method of reducing the amount of waste electrochemical energy storages, through the use of inductive power supplies. The idea of the operation of such circuits has been discussed and the Qi Wireless Charging standard, applicable since 2011, has been characterised. As an example of a device with wireless power supply, a computer indicator system has been provided. Tests have been carried out and the correctness of operation of this solution has been verified. It has been demonstrated that in some cases it is possible to resign from power supplies based on batteries or accumulators, and use wireless power supplies instead, without degrading the functional properties of devices. Solutions of this type may contribute to the protection of the natural environment.
    W pracy omówiono problematykę recyklingu elektrochemicznych źródeł energii elektrycznej takich jak baterie i akumulatory przenośnie. Na podstawie raportów Głównego Inspektoratu Ochrony Środowiska przeanalizowano zbieralność zużytych baterii i akumulatorów w Polsce w latach 2010-2018. Pomimo rosnącego z roku na rok procentowego wskaźnika zbieralności wykazano, że znaczna masa baterii i akumulatorów wciąż nie jest poddawana recyklingowi. W artykule przedstawiono metodę ograniczenia ilości zużywanych elektrochemicznych zasobników energii elektrycznej poprzez zastosowanie zasilania indukcyjnego. Omówiono ideę działania tego typu układów oraz scharakteryzowano obowiązujący od 2011 roku standard Qi Wireless Charging. Jako przykład urządzenia zasilanego bezprzewodowo podano układ wskaźnika komputerowego. Wykonano badania i zweryfikowano poprawność działania tego rozwiązania. Wykazano, że w niektórych przypadkach możliwe jest zrezygnowanie z zasilania bateryjnego lub akumulatorowego na rzecz zasilania bezprzewodowego bez pogorszenia własności funkcjonalnych urządzeń. Rozwiązania tego typu mogą przysłużyć się ochronie środowiska.
    Źródło:
    Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 444-455
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on a novel hybrid shielding structure of magnetic coupler for inductive power transfer system
    Autorzy:
    Liu, Yun Rui
    Wang, Chunfang
    Xia, Dongwei
    Yue, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/1841326.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coupling coefficient
    electromagnetic shielding
    finite element simulation
    optimization design
    wireless power transfer
    współczynnik sprzężenia
    ekranowanie elektromagnetyczne
    symulacja elementów skończonych
    optymalizacja projektu
    bezprzewodowy transfer mocy
    Opis:
    With the development of wireless power transfer technology, more and more attention has been paid to its electromagnetic safety. In this paper, a novel hybrid shielding structure composed of the innermost fan-shaped ferrite, the interlayer nanocrystalline stripand the outermost aluminum foil is proposed to shield the electromagnetic field of the inductive power transfer system. Eight structure parameters of the proposed shielding areoptimized by finite element simulation, in order to reduce the magnetic leakage of the system and improve the utilization rate of shielding materials. In addition, the proposed structure is compared with two types of typical double-layer hybrid shielding from the perspectives of the weight, the coupling coefficient and the magnetic flux leakage. Both simulation and experiment results show that the cost and weight of the proposed shield are about 60% lower than the traditional disk shield. More over, the shielding layer proposed in this paper can not only effectively reduce the magnetic flux leakage of the system, but also maintain a high coupling coefficient.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 129-143
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mikro system zasilania bezprzewodowego
    The micro power wireless system
    Autorzy:
    Marciniak, P.
    Galla, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/268645.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    zasilanie
    bezprzewodowe
    power supply
    wireless
    Opis:
    Wzrastająca na rynku liczba układów mikrokontrolerów o bardzo niskiej konsumpcji energii elektrycznej umożliwia budowę układów zasilania bezprzewodowego, opartych o układy zbierające energię elektryczną z różnych źródeł występujących w naszym otoczeniu. Obecnie powstające układy wytwarzające energie elektryczną korzystają z jej konwersji m.in. z następujących źródeł: promieniowania słonecznego, energii drgań i wibracji, występujących różnic temperaturowych, oraz otaczających nas pól elektromagnetycznych. W artykule przedstawiono wyniki prac nad systemem zasilania bezprzewodowego wykorzystującego zbieranie energii z pól elektromagnetycznych związanych z pracującymi układami telefonii komórkowej oraz pasma 868 MHz.
    The occurrence of electrostatic discharge can lead to very large losses in production or service of electronic equipment. In case of special production ESD can even lead to serious accidents. Phenomenon of electrostatic discharge (ESD) is related to such physicochemical processes friction, grinding, spraying and rapid separation or combining of non-conductive, or well-insulated solid, liquid and/or gas. In some cases it is necessary to monitor continuously the protected zone. This article presents ongoing work on electrostatic discharge detection system based on the collection and analysis of electromagnetic emission signal appearing at the time of ESD occurrence. The article presents results obtained from simulation studies and shows the system made on the basis of previously mentioned results.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2012, 31; 101-103
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic Field Generated by Wireless Alarm Devices
    Autorzy:
    Pospisilik, M.
    Vnencakova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/963854.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    power density
    electromagnetic field
    Opis:
    Together with the rise of importance of devices employing wireless networks based on the principle of radio frequency data transfers, also the discussion on harmfulness of the electromagnetic radiation has occurred. The authors of this paper obviously cannot provide unambiguous answers to stop this discussion. On the other way, they can provide the reader of this paper with real data obtained by measurements processed inside a semi anechoic chamber that were performed at several wireless alarm peripherals. The measured values are compared to the technical and hygienic standards so the reader can form an idea of the amount of the radiated energy. Moreover, examples of waterfall diagrams of spectra generated by the devices are also listed in this paper.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 1; 57-64
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Policies for Transmit Power Control in the Conditions of Jamming in Clustered Wireless System
    Autorzy:
    Michalak, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1844445.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    clustered network
    transmit power control
    jamming
    wireless system
    Opis:
    This article presents a consistent solution of Transmit Power Control in centralized (clustered) wireless network with and without jamming. Depending on the policy assumed, appropriate solutions are applied to minimize the power used in a system or to satisfy expected Quality of Service. Because of specific nature of the system there is no optimal solution which can be applied in practice. Correctness and effectiveness of four proposed Transmit Power Control algorithms was presented in the form of computer simulation results in which the system capacity, mean power used and the number of successful links were described.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 4; 679-685
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype of a DSP-based instrument for in-service wireless transmitter power measurement
    Autorzy:
    Angrisani, L.
    Cennamo, F.
    Scarpato, G.
    Schiano Lo Moriello, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/220862.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless transmitters
    power measurements
    in-service testing
    DSP
    Opis:
    A prototype of a DSP-based instrument for in-service transmitter power measurements is presented. The instrument implements a signal-selective algorithm for power measurements that is suitable for use in wireless environments, where possible uncontrolled interfering sources are present in the radio channel and are overlapped to the signal emitted by the transmitter under test, possibly in both time and frequency domain. The measurement method exploits the principles of cyclic spectral analysis, which are briefly recalled in the paper. Potentialities, as well as limitations of the prototype use are discussed, and the results of experiments with both modulated and unmodulated interfering sources are presented.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 4; 699-708
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Implementation of Wireless Module Based on ZiGBee for Applications in Machine Tools
    Autorzy:
    Kasprzak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/100139.pdf
    Data publikacji:
    2015
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    machine tool
    wireless modules
    structure
    tests
    ZigBee
    power consumption
    Opis:
    This paper presents a concept of a wireless measuring system based on ZigBee modules, and the stages in its implementation. The distinctive feature of the built measuring systems is their high resistance to environmental conditions. To a large extent this was achieved through the use of induction charging. The effectiveness of this solution was determined by comparing it with conventional charging. The measuring modules built in accordance with this concept were tested in the work space of a machine tool during milling. Special attention was paid to the amount of power consumed by the tested modules during different modes of their operation. The response time of the modules during their operation in the work space of the working machine tool and in the case when the modules were completely immersed in water was tested. By comparing the measured response times the effect of the above factors on the correctness of operation of the measuring system was determined.
    Źródło:
    Journal of Machine Engineering; 2015, 15, 4; 133-143
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wearable biosensing: signal processing and communication architectures issues
    Autorzy:
    Celka, P.
    Vetter, R.
    Renevey, P.
    Verjus, C.
    Neuman, V.
    Luprano, J.
    Decotignie, J. D.
    Piguet, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/309491.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    wearable sensors
    wireless BAN
    biosignal processing
    low-power DSP
    Opis:
    Long-term monitoring of human vital signs is becoming one of the most important fields of research of biomedical engineering. In order to achieve weeks to months of monitoring, new strategies for sensing, conditioning, processing and communication have to be developed. Several strategies are emerging and show different possible architectures. This paper essentially focuses on issues in wearable biosignal processing and communication architecture currently running at the Swiss Center for Electronics and Microtechnology (CSEM) in the framework of several European projects.
    Źródło:
    Journal of Telecommunications and Information Technology; 2005, 4; 90-104
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The wireless hydrostatic transmission control by the use of mobile technology
    Autorzy:
    Kucybała, P.
    Pobędza, J.
    Sobczyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/248044.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    fluid power control system
    hydrostatic transmission system
    wireless control system
    Opis:
    The paper presents the concept of a new approach for remote control and monitoring of parameters of mobile or stationary machines in real time on the example of the hydrostatic transmission drive test stand. The proposed system control and monitoring is the mobile system which is closely related with the three applications written in a different programming languages, such as: java (Android) – mobile application runs on the tablet, C language – server application joins xPC Target with tablet, PHP – admin panel to manage mobile control platform. Controlling of the hydrostatic drive stand is implemented using an application installed on the tablet. This application is connected with computer’s real-time (xPC Target) module, generated in Matlab. The computer with xPC Target is equipped with a measuring-control card, to which the control signals are transmitted. This hardware-software component plays the connecting role between machine and operator of the mobile platform installed on the tablet. The application allows observe important parameters such as pressure, volumetric flow rate, temperature, velocity, torque in real-time, as well as, it enable, by use of special graphic slider on the tablet’s screen, to set control parameters such as: speed of electric motor, the opening and switching positions of the directional valve, as well as, setting the load by pressure relief valve. Based on this system research related to the verification of system operation were performed for different setting of the hydrostatic transmission drive speed controller, and selected results are presented in the paper.
    Źródło:
    Journal of KONES; 2014, 21, 2; 169-175
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks
    Autorzy:
    El-Bendary, M. A. M.
    El-Tokhy, M. A. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/308324.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    Bluetooth
    EDR
    packet loss
    power efficiency
    Wireless Personal Area Network
    Opis:
    This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 4; 100-107
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical analysis of the efficiency of a V2G wireless charger for electric vehicles
    Autorzy:
    Triviño, Alicia
    Gonzalez-Gonzalez, Jose M.
    Aguado, Jose A.
    Powiązania:
    https://bibliotekanauki.pl/articles/136256.pdf
    Data publikacji:
    2019
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    V2G
    wireless discharge
    losses
    efficiency
    electric vehicle
    inductively-coupled power system
    ICPT
    bidirectional
    wireless charging
    Opis:
    V2G (Vehicle-to-grid) technology will report important benefits for the operation and safety of the grid. In order to facilitate the expansion of the V2G technology in a future, it is recommended to offer the drivers with easy to use methods to charge and discharge their EV batteries. In this sense, wireless chargers are expected to play a relevant role in the future electrical networks as it reduces the users intervention. The development of this kind of system is still open to improve them in terms of their operation, their compliance and their control. An important issue for the evaluation of these systems is the efficiency, which measures the power losses occurring in the system. This paper addresses a deep study about the losses in a bidirectional wireless charger. Then, it provides with a mathematical model to characterize them. This model is validated by means of experimental results conducted in a 3.7-kW prototype.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2019, 3, 1; 9-14
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the TETRA Wireless Communication System in the Power Industry
    Zastosowanie systemu bezprzewodowej łączności TETRA w elektroenergetyce
    Autorzy:
    Chłusewicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/397270.pdf
    Data publikacji:
    2016
    Wydawca:
    ENERGA
    Tematy:
    TETRA
    system elektroenergetyczny
    system łączności bezprzewodowej
    power system
    wireless communication system
    Opis:
    The article discusses the TETRA (Terrestrial Trunked Radio) wireless communication system in terms of its use in the power industry. It also discusses basic parameters of the system, its architecture, and possibilities of its application by the power company for voice communication and data transmission both for dispatch communication, direct communication between employees and in telemetry, telecontrol, and in remote control of the power network facilities.
    W artykule omówiono system łączności bezprzewodowej TETRA (ang. Terrestrial Trunked Radio) pod kątem jego wykorzystywania w sektorze elektroenergetyki. Omówione zostały podstawowe parametry systemu, jego architektura oraz możliwości jego zastosowania przez przedsiębiorstwo energetyczne do komunikacji głosowej i transmisji danych zarówno w celu łączności dyspozytorskiej, komunikacji bezpośredniej między pracownikami, jak i w telemetrii, telekontroli i w zdalnym sterowaniu obiektami sieci elektroenergetycznej.
    Źródło:
    Acta Energetica; 2016, 4; 27-33
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Performance Analysis of a Tripleband Rectangular Slot Microstrip Patch Antenna for Wi-Fi, Wi-MAX and Satellite Applications
    Autorzy:
    Hossain, Md. Biplop
    Hossain, Md. Faruque
    Powiązania:
    https://bibliotekanauki.pl/articles/2055262.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wireless communication
    triple band antenna
    gain
    directivity
    transmission power
    link budget
    Opis:
    A triple-band microstrip patch antenna is presented in this article with detail investigation of its working mechanism and performance characteristics. The antenna consists of a rectangular slot on the patch to achieve multiband operation. Three distinct frequencies of 2.4 GHz, 5.5 GHz and 7.5 GHz are achieved with return losses of 27 dB, 29 dB and 29 dB respectively. The Impedance Bandwidths are 70 MHz (2.52 GHz-2.44 GHz) at 2.4 GHz, 220 MHz (5.65 GHz-5.43 GHz) at 5.5 GHz and 250 MHz (7.57 GHz-7.32 GHz) at 7.5 GHz, which satisfy the requirements of Wi-Fi, Wi-MAX and satellite communications bands. The fabricated prototype of the antenna has total dimension of 53×53×1.6 mm³ over FR4 substrate. The antenna is simple and has sensible radiation characteristics with considerable gain. This work also focuses on developing a Link Budget model for its application in satellite communication. Most notably, it examines overall system efficiency and optimum path loss, distance analysis, system noise temperature, signal to noise power ratio, the size of antenna and the overall customer satisfactions. The highest gain of the antenna is achieved as 3.5 dB in the band (5.65 GHz-5.43 GHz), while the highest directivity and bandwidth are found as 8.7 dBi and 250 MHz respectively in the higher operating band. The affordable agreement between the simulated and measuring outcomes justifies that the antenna is often applicable for Wi-Fi (2.4 GHz), Wi-MAX (5.25 – 5.85 GHz) and satellite (7.24 – 7.57 GHz) communications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 2; 217--222
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zipf Distribution Power AllocationAapproach for NOMA Systems
    Autorzy:
    Himeur, Hanane
    Meriah, Sidi Mohammed
    Derraz, Fouad
    Powiązania:
    https://bibliotekanauki.pl/articles/27311910.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    NOMA
    wireless networks
    power domain
    Zipf distribution law
    5G networks
    Opis:
    Non-orthogonal multiple access (NOMA) has received tremendous attention for the development of 5G and beyond wireless networks. Power-domain NOMA works on the concept of assigning varying power levels to users within the same frequency and time block. In this paper we propose a novel power allocation approach that uses the Zipf distribution law that satisfies the basic condition of a NOMA system. The Zipf PA is characterized by the simplicity and ease of implementation that allows to extend the capacity of the system to support a large number of users. The numerical results show that the system achieves high throughput and energy efficiency without any parameter optimization constraints as well as improved capacity by increasing the number of users compared to the NOMA system with existing power allocation techniques.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 559--564
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Beam Attenuation Determined by the Method of Available Optical Power in Turbulent Atmosphere
    Autorzy:
    Dordov´a, L.
    Wilfert, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/308884.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    method of available power
    optical wireless link
    Rytov approximation
    turbulent atmosphere
    Opis:
    This work is focused on the atmospheric turbulence effect and a new method for determining optical signal attenuation caused by turbulence is presented here. A new method of power budget of optical links comes from optical intensity distribution in a laser beam after the beam passed through turbulent atmosphere. Results given by this method are compared with Rytov approximation which is nowadays the most frequently used method for determining turbulent attenuation. Results for communication wavelength of 850 nm and 1550 nm are presented as well as the results for a wavelength of 633 nm.
    Źródło:
    Journal of Telecommunications and Information Technology; 2009, 2; 53-57
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jamming Signal Cancellation by Channel Inversion Power Control for Preserving Covert Communications
    Autorzy:
    Hai, Ngo Thanh
    Khoa, Dang Le
    Powiązania:
    https://bibliotekanauki.pl/articles/24200738.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    channel inversion power control
    covert wireless communication
    effective transmission rate
    uninformed jammer
    Opis:
    Uninformed jammers are used to facilitate covert communications between a transmitter and an intended receiver under the surveillance of a warden. In reality, the signals the uniformed jammer emits to make the warden’s decision uncertain have inadvertently interfered with the detection of the intended receiver. In this paper, we apply truncated channel inversion power control (TCIPC) to both the transmitter and the uninformed jammer. The TCIPC scheme used on the uninformed jammer may help the intended receiver remove jamming signals using the successive interference cancellation (SIC) technique. Under the assumption that the warden knows the channel coefficient between two intended transceivers and achieves the optimal detection power threshold, we form the optimization problem to maximize the effective transmission rate (ETR) under covertness and decoding constraints. With the aim of enhancing covertness-related performance, we achieve the optimal power control parameters and determine system parameter-related constraints required for the existence of these solutions. According to the simulations, the use of the TCIPC scheme on the uninformed jammer significantly improves covertness-related performance in comparison to that of random power control (RPC) and constant power control (CPC) schemes. In addition, simulation results show that, for the TCIPC scheme: 1) the maximum ETR tends to converge as the transmitter’s or the uninformed jammer’s maximum transmit power increases, and 2) there exists an optimal value of the transmitter’s predetermined transmission rate to achieve the optimal performance.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 22--34
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projekt listwy zasilającej w oparciu o koncepcję Internetu Rzeczy
    The Internet Things on the example of a power strip project
    Autorzy:
    Nowomiejski, A.
    Łaguna, Ł.
    Mich, D.
    Markiewicz, S.
    Galla, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/267655.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
    Tematy:
    Internet rzeczy
    listwa zasilająca
    sterowanie bezprzewodowe
    Internet of things
    power strip
    wireless
    Opis:
    W referacie przedstawiono podstawowe uwarunkowania, jakimi należy kierować się przy opracowywaniu urządzeń należących do klasy obiektów określanych mianem „Internetu Rzeczy” na przykładzie zrealizowanego prototypu listwy zasilającej. Przedstawione w pracy urządzenie przeznaczone jest do sterowanie różnorodnymi odbiornikami energii elektrycznej niemogącymi być bezpośrednio sterowanymi z sieci Ethernet. W pracy przedstawiono przyjęte założenia projektowe oraz zastosowane rozwiązania. Przedawniono również wyniki testów prototypu i wskazano na napotkane problemy.
    The paper presents the basic conditions that should be followed when developing Internet of Things (IoT) devices on the example of the implemented power strip arrangement that allows control of various electric energy receivers. The article assumed design assumptions and applied solutions. The results of the prototype tests were also subjected to expiration and indicates the problems encountered.
    Źródło:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2018, 60; 97-100
    1425-5766
    2353-1290
    Pojawia się w:
    Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Consumption in Wireless Systems Equipped with RES, UAVs, and IRSs
    Autorzy:
    Samorzewski, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/24200740.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    6G
    intelligent reconfigurable surfaces
    power consumption
    renewable energy sources
    unmanned aerial vehicles
    wireless systems
    Opis:
    This paper investigates energy budget characteristics of mobile base stations (BSs) having the form of unmanned aerial vehicles (UAVs) equipped with radio frequency (RF) transceivers, intelligent reconfigurable surfaces (IRSs), and renewable energy sources (RES). The results obtained highlight the benefits and challenges related to using the aforementioned mobile BS, from the energy-related point of view. The specific cases researched involved two types of UAV devices, i.e. multirotor and fixed-wing (airplane-like) aircraft.
    Źródło:
    Journal of Telecommunications and Information Technology; 2023, 2; 35--40
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modulation-Mode Assignment for SVD-assisted Downlink Multiuser MIMO Transmission Schemes with Iterative Detection
    Autorzy:
    Ahrens, A.
    Benavente-Peces, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/226541.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple-input multiple-output system
    singular value decomposition
    bit allocation
    power allocation
    wireless transmission
    multiuser transmission
    Opis:
    Since the capacity of multiple-input multiple-output (MIMO) systems increases linearly with the minimum number of antennas at both, the transmitter as well as the receiver side, MIMO systems have attracted a lot of attention for both frequency and non-frequency selective channels and reached a state of maturity. By contrast, MIMO-aided multiple-user systems require substantial further research. In comparison to zero-forcing (ZF) multiuser transmission techniques, where all users are treated jointly, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO solution takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 127-134
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody pozyskiwania energii dla autonomicznych bezprzewodowych sieci czujnikowych
    Energy harvesting methods for autonomous wireless sensor networks
    Autorzy:
    Olszyna, J.
    Winiecki, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/154481.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    rozproszone systemy pomiarowe
    autonomiczne bezprzewodowe sieci czujnikowe
    pozyskiwanie energii
    distributed measurement systems
    autonomous wireless sensor networks
    power harvesting
    Opis:
    W artykule przedstawiono metody pozyskiwania energii dla autonomicznych bezprzewodowych sieci czujnikowych. Pozyskiwanie energii w takich systemach odbywa się za pomocą dedykowanych układów, w niektórych przypadkach źródłem energii może być sam obiekt pomiarowy. Źródła energii odpowiednie dla ww. zastosowań możemy przyporządkować do jednej z kategorii: ruch i wibracje, różnica temperatur, promieniowanie świetlne i fale radiowe.
    The paper presents energy harvesting methods suitable for autonomous wireless sensor networks. The average power demand of a typical sensor is between 20-100 žW [1]. In such systems energy is harvested via dedicated circuits. In some cases a measured object can be an energy source. Energy sources adequate for the abovementioned applications can be assigned to one of the categories: movement and vibration, temperature differences, light radiation, radio-frequency waves [1, 2, 3]. An analysis of available solutions in terms of power density or dimensions of power harvesting circuit is required for each energy source. Another important issue is the energy source power characteristic and whether it is controllable. If harvested energy is not stored (battery), a key parameter becomes the average power. In the paper we take a close look at energy harvesting approaches, along with the underlying physics and the power output. The achievable power ranges from 0,1 žW/cm2 to 15 mW/cm2 (depending on the size of the energy harvesting unit). The highest power can be achieved with photovoltaic cells under direct exposure to the sunlight.
    Źródło:
    Pomiary Automatyka Kontrola; 2012, R. 58, nr 10, 10; 837-839
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmisja sygnałów telemechaniki w systemach elektroenergetycznych
    Transmission of telemechanics signals in power systems
    Autorzy:
    Pluta, S.
    Tarczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/154134.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    systemy SCADA
    telemechanika
    stacja energetyczna
    transmisja danych
    systemy światłowodowe
    systemy bezprzewodowe
    SCADA systems
    telemechanics
    power substation
    data transmission
    fiber system
    wireless system
    Opis:
    W artykule przedstawiono zagadnienia związane ze stosowaniem łączy transmisyjnych dla przesyłu informacji niezbędnych do prawidłowego działania systemów automatyki zabezpieczeniowej, telemechaniki, telemetrii w systemach i sieciach elektroenergetycznych. Łącza takie są szkieletem komputerowej sieci technologicznej SCADA służącej do prowadzenia ruchu, eksploatacji systemów automatyki i zabezpieczeń, pomiarów i rozliczeń energii. Zwrócono uwagę na nieuchronną migrację rozwiązań obiektowych do standardu IEC 61850, a w zakresie stosowania mediów transmisyjnych przedstawiono znaczenie techniki światłowodowej i bezprzewodowej.
    This paper presents the survey of telemechanics signals transmission techniques within the field of Substation Automation System in power substations and SCADA systems in control centers. The survey is divided into two parts. In the first part local communication systems in a substation are described. The paper also discusses implementation of the new communication standard IEC 61850. IEC61850 running on an Ethernet based station bus reduces the wiring and commissioning time by providing one common platform for the whole communication in the substation. The implementation of communication links between remote systems in substations and the central SCADA application are presented in part two. Existing wireless and optical fiber data transmission technologies are discussed and their suitability for this application is considered. Some possible solutions of long communication links are suggested. Telecontrol signal transmission techniques require unique communication systems, including slow dial-up phone lines, medium speed RF connections, and broadband wired/wireless IP networks. These networks are supported by many solutions, including microwave radio, trunked radio systems, mobile data radio systems, PDH, SONET/SDH, and PCM (n x 64 Kbps). To support the mission-critical traffic of power automation systems, an IP/MPLS-based communications infrastructure is needed.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 5, 5; 499-501
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Joint queue-perturbed and weakly coupled power control for wireless backbone networks
    Autorzy:
    Olwal, T. O.
    Djouani, K.
    Kogeda, O. P.
    van Wyk, B. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330956.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie mocą
    sterowanie rozproszone
    sieć szkieletowa
    sterowanie optymalne
    decentralized power control
    singular perturbation theory
    weak coupling theory
    wireless backbone networks
    optimal control theory
    Opis:
    Wireless Backbone Networks (WBNs) equipped with Multi-Radio Multi-Channel (MRMC) configurations do experience power control problems such as the inter-channel and co-channel interference, high energy consumption at multiple queues and unscalable network connectivity. Such network problems can be conveniently modelled using the theory of queue perturbation in the multiple queue systems and also as a weak coupling in a multiple channel wireless network. Consequently, this paper proposes a queue perturbation and weakly coupled based power control approach for WBNs. The ultimate objectives are to increase energy efficiency and the overall network capacity. In order to achieve this objective, a Markov chain model is first presented to describe the behaviour of the steady state probability distribution of the queue energy and buffer states. The singular perturbation parameter is approximated from the coefficients of the Taylor series expansion of the probability distribution. The impact of such queue perturbations on the transmission probability, given some transmission power values, is also analysed. Secondly, the inter-channel interference is modelled as a weakly coupled wireless system. Thirdly, Nash differential games are applied to derive optimal power control signals for each user subject to power constraints at each node. Finally, analytical models and numerical examples show the efficacy of the proposed model in solving power control problems in WBNs.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 749-764
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission of biomedical data from BIOSIP modules in a wireless personal area network with synchronous measurements, and the future use in the internet of things
    Autorzy:
    Szuster, B.
    Szczurek, Z.
    Kowalski, P.
    Kubik, B.
    Michnik, A.
    Wiśniowski, R.
    Świda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/397939.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    body sensor network
    wireless medicine
    low power
    personal area network
    Bluetooth Smart
    ANT
    BioSip
    WPAN
    Wireless Personal Area Network
    Body Area Networks
    internet of things (IoT)
    IoT
    IPv6
    Internet Protocol version 6
    sieć sensorowa na powierzchni ciała
    medycyna bezprzewodowa
    sieć osobista
    Internet rzeczy
    protokół internetowy w wersji 6
    Opis:
    The paper aims to present the organizational concept of the wireless personal area network (WPAN network) transmitting biomedical data, used in the BioSip system. The network transmits data from recording modules arranged on the subject's body to a collective node (data integrator). At the same time, all the necessary properties are maintained, i.e. low power consumption of the modules, increased resistance of the network to artefacts, the required transmission speed and signal delays. The options to synchronize measurements in various modules have also been presented, along with the resulting benefits. The wireless personal area network of BioSip modules may be based on various communication protocols, such as Bluetooth Smart or ANT. The BioSip network builds on its own protocol based on transmission mechanisms by Nordic. The software of BioSip modules may be adapted for operation in the Internet of Things through network protocol layers made available by Nordic.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2016, 7, 1; 33-40
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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