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    Wyświetlanie 1-3 z 3
    Tytuł:
    Ɵ(1) Time Algorithm for Master Selection in Ad-hoc Wireless Networks
    Autorzy:
    Khattabi, Mohammed
    Elmesbahi, Jelloul
    Khaldoun, Mohammed
    Errami, Ahmed
    Bouattane, Omar
    Powiązania:
    https://bibliotekanauki.pl/articles/226674.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cluster-based networks
    cluster head selection
    ad-hoc networks
    wireless sensors networks
    SDR
    USRP
    simulink
    Opis:
    This paper details a hardware implementation of a distributed Ɵ(1) time algorithm allows to select dynamically the master device in ad-hoc or cluster-based networks in a constant time regardless the number of devices in the same cluster. The algorithm allows each device to automatically detect its own status; master or slave; based on identifier without adding extra overheads or exchanging packets that slow down the network. We propose a baseband design that implements algorithm functions and we detail the hardware implementation using Matlab/Simulink and Ettus B210 USRP. Tests held in laboratory prove that algorithm works as expected.
    Źródło:
    International Journal of Electronics and Telecommunications; 2020, 66, 3; 521-527
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enabling Wireless In-band Full-duplex
    Autorzy:
    Elmesbahi, Jelloul
    Khaldoun, Mohammed
    Errami, Ahmed
    Khattabi, Mohammed El
    Bouattane, Omar
    Powiązania:
    https://bibliotekanauki.pl/articles/226551.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    in-band full-duplex
    wireless
    USRP
    SDR
    GNU radio
    Opis:
    This paper presents a baseband model and an enhanced implementation of the wireless full duplex analog method introduced by [1].Unlike usual methods based on hardware and software self- interference cancelation, the proposed design relies on FSK modulation. The principle is when the transmitter of a local end is sending data by modulating the carrier with the appropriate frequency deviation, its own receiver is checking if the remote transmitter is using the opposite deviation. Instead of architectures often used by both non-coherent and coherent receivers that require one filter (matched filter for coherent detection) for each frequency deviation, our design uses one mixer and one single integrator-decimator filter. We test our design using Universal Software Radio Peripheral as radio frequency front end and computer that implements the signal processing methods under free and open source software. We validate our solution experimentally and we show that in-band full duplex is feasible and synthesizable for wireless communications.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 3; 429-434
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Utilization of ASTER data in lithological and lineament mapping of the southern flank of the Central High Atlas in Morocco
    Autorzy:
    Errami, Maryam
    Algouti, Ahmed
    Algouti, Abdellah
    Farah, Abdelouhed
    Agli, Saloua
    Powiązania:
    https://bibliotekanauki.pl/articles/2204372.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Amezri-Amassine area
    PCA
    Principal Component Analysis
    band ratio
    MNF
    Minimum Noise Fraction
    automatic lineament extraction
    Amezri
    Amassine
    analiza głównych składowych
    Opis:
    Geological mapping undoubtedly plays an important role in several studies and remote sensing data are of great significance in geological mapping, particularly in poorly mapped areas situated in inaccessible regions. In the present study, Principal Component Analysis (PCA), Band Rationing (BR) and Minimum Noise Fraction (MNF) algorithms are applied to map lithological units and extract lineaments in the Amezri-Amassine area, by using multispectral ASTER image and global digital elevation model (GDEM) data for the first time. Following preprocessing of ASTER images, advanced image algorithms such as PCA, BR and MNF analyses are applied to the 9ASTER bands. Validation of the resultant maps has relied on matching lithological boundaries and faults in the study area and on the basis of pre-existing geological maps. In addition to the PCA image, a new band-ratio image, 4/6–5/8–4/5, as adopted in the present work, provides high accuracy in discriminating lithological units. The MNF transformation reveals improvement over previous enhancement techniques, in detailing most rock units in the area. Hence, results derived from the enhancement techniques show a good correlation with the existing litho-structural map of the study area. In addition, the present results have allowed to update this map by identifying new lithological units and structural lineaments. Consequently, the methodology followed here has provided satisfactory results and has demonstrated the high potential of multispectral ASTER data for improving lithological discrimination and lineament extraction.
    Źródło:
    Geologos; 2023, 29, 1; 1--20
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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