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    Wyświetlanie 1-6 z 6
    Tytuł:
    A Multichannel Receiver of the Experimental FM Based Passive Radar Using Software Defined Radio Technology
    Autorzy:
    Szlachetko, B.
    Lewandowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226436.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    SDR
    passive radar
    GNU Radio
    USRP
    Opis:
    In this paper we present results of research on multichannel receiver using Software Defined Radio technology. This receiver is a part of the experimental FM based passive radar being designed. The hardware platform of the receiver consists of the Universal Software Defined Radio Peripheral devices. In the paper we propose modifications of the USRP's FPGA configuration and GNU Radio code. These modifications allow for developing six/nine synchronous input channel receiver based on two/tree USRPs respectively. Issues of synchronization of separate USRP devices by assuring synchronous sampling were presented. We also propose the solution of the problem of the alignment of the data streams being sent from USRP devices via USB to the PC host.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 301-306
    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:
    Performance Analysis of the Cognitive Radio Network with Opportunistic Spectrum Access
    Autorzy:
    Chęciński, R.
    Kaszuba-Chęcińska, A.
    Kryk, M.
    Łopatka, J.
    Malon, K.
    Skokowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226072.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MANET
    cognitive radio
    dynamic spectrum access
    USRP
    RF switch matix
    real time demonstrator
    Opis:
    Efficient access to the spectral resources becomes a challenge for future military wireless communication systems. It requires spectral situation awareness, knowledge of current regulations, local policies and hardware platform limitations. It can be achieved by cognitive radios, realizing cognitive cycle, consisting typically of continuous observation, orientation, reasoning and decision making. All these elements must be realized in parallel and shouldn't interfere with each other. Even more difficult issue is related with cooperation between different nodes, especially in wireless domain, in harsh propagation conditions. Unpredictable phenomena create hard conditions for all deterministic behavior models, and their reproduction is a key element for efficient operation of the network. Very popular computer simulations are always simplified, and real time implementation gives an opportunity to make the next step in system elaboration. This paper presents a real-time demonstrator of cognitive radio network. It can work both in wired mode, using radio channel emulator and in mobile mode, to verify influence of real conditions on proposed cognitive solutions and assess their effectiveness.
    Źródło:
    International Journal of Electronics and Telecommunications; 2018, 64, 1; 51-56
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie platformy radia programowalnego USRP do przechwytywania informacji o użytkownikach GSM
    Capture information about GSM users using software defined radio platform USRP
    Autorzy:
    Kaszuba, A.
    Chęciński, R.
    Łopatka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/209975.pdf
    Data publikacji:
    2013
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    telekomunikacja
    GSM
    SDR
    radio programowalne
    USRP
    RRLP
    Open BTS
    telecommunication
    software defined radio
    Opis:
    W artykule przedstawiono architekturę stacji bazowej OpenBTS zaimplementowanej na platformie radia programowalnego USRP. Dodatkowo przeprowadzono analizę możliwości pozyskiwania informacji lokalizacyjnych oraz identyfikacyjnych o użytkownikach sieci GSM.
    This paper presents an implementation of access point of GSM network, using architecture of the software defined radio USRP N210. Analysis of the possibility of obtaining location and identification information of GSM users are also presented.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2013, 62, 3; 27-36
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance of a Software Defined Radio based Non-Coherent OFDM Wireless Link
    Autorzy:
    Narayana, Nandana
    Sure, Pallaviram
    Powiązania:
    https://bibliotekanauki.pl/articles/27311898.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Software Defined Radio (SDR)
    Universal Software Radio Peripheral (USRP)
    LabView
    LS channel estimation
    denoising threshold
    Opis:
    With improved technological successions, wireless communication applications have been incessantly evolving. Owing to the challenges posed by the multipath wireless channel, radio design prototypes have become elemental in all wireless systems before deployment. Further, different signal processing requirements of the applications, demand a highly versatile and reconfigurable radio such as Software Defined Radio (SDR) as a crucial device in the design phase. In this paper, two such SDR modules are used to develop an Orthogonal Frequency Division Multiplexing (OFDM) wireless link, the technology triumphant ever since 4G. In particular, a non-coherent end-to-end OFDM wireless link is developed in the Ultra High Frequency (UHF) band at a carrier frequency of 470 MHz. The transmitter includes Barker sequences as frame headers and pilot symbols for channel estimation. At the receiver, pulse alignment using Max energy method, frame synchronization using sliding correlator approach and carrier offset correction using Moose algorithm are incorporated. In addition, wireless channel is estimated using Least Square (LS) based pilot aided channel estimation approach with denoising threshold and link performance is analyzed using average Bit Error Rate (BER), in different pilot symbol scenarios. In a typical laboratory environment, the results of BER versus receiver gain show that with 4 pilot symbols out of 128 carriers, at a gain of 20 dB, BER is 0.160922, which is reduced to 0.136884 with 16 pilot symbols. The developed link helps OFDM researchers to mitigate different challenges posed by the wireless environment and thereby strengthen OFDM technology.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 537--544
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-6 z 6

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