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    Wyświetlanie 1-6 z 6
    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:
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-6 z 6

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