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    Tytuł:
    Dwufalowe łącze optyczne
    Dual wavelength optical link
    Autorzy:
    Rajba, S.
    Lipiński-Kempys, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/155870.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    FSO (Free Space Optics)
    bezprzewodowe łącza w podczerwieni
    transmisja optyczna
    optolinia
    wireless infrared links
    optical transmission
    optolink
    Opis:
    Przedmiotem pracy jest analiza warunków pracy łączy optycznych w otwartej przestrzeni. Przedstawiono podstawowe uwarunkowania poprawnej pracy takich łączy. W oparciu o pewne doświadczenia eksploatacyjne z tego zakresu i na podstawie przedstawionej analizy zaproponowano koncepcję łącza dwufalowego, wskazując na wybrane długości fal do pracy łącza. W podsumowaniu wskazano na właściwości tego typu rozwiązań komunikacyjnych i na pola ich zastosowań w technice przesyłania informacji.
    The demand for implementation of digital data transmission lines in various topographies and field conditions is increasing. Such diversity requires many original solutions. Certainly one of the solutions are links that use free space to transmit information on optical wavelengths. The idea is not new, but the new optical and electronic technologies make this possible. The subject of investigations is to analyze the working conditions of optical links in open spaces. The issue is known in the literature as Free Space Optics Communication (FSO). In this paper there are presented the basic conditions for correct work of such links. On a basis of certain operating experience in this field and the presented analysis there was proposed the concept of a dual wavelength link with indicating the selected length waves for the link work . In the summary there are described the properties of such solutions in the fields of communications and their applications to information transmission technology.
    Źródło:
    Pomiary Automatyka Kontrola; 2012, R. 58, nr 12, 12; 1105-1109
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of Finite-Sized Aperture on the Performance of Differential Multihop DF-FSO Network
    Autorzy:
    Agarwal, Deepti
    Yadav, Poonam
    Powiązania:
    https://bibliotekanauki.pl/articles/2200711.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    differencial modulation
    K-distribution
    Free space optics (FSO)
    Average bit error rate (BER)
    Decode and forward relaying
    pointing error
    Opis:
    This paper investigates the differential binary modulation for decode-and-forward (DF) based relay-assisted free space optical (FSO) network under the effect of strong atmospheric turbulence together with misalignment error (ME). The atmospheric fading links experience K-distributed turbulence. First we derive novel closed form expression for average bit error rate (BER) and outage probability (OP) in terms of Meijer’s G function. Further, the OP of differential DF-FSO system with multiple relays is derived. We also analyze the asymptotic performance for the sake of getting the order of diversity and the coding gain. The power allotment term is utilized to examine the effect of different power allotment techniques on BER and OP. The simulation results have been used to validate the derived analytical results.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 807--813
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative BER Analysis of Free Space Optical System Using Wavelength Diversity over Exponentiated Weibull Channel
    Autorzy:
    Shah, Dhaval
    Joshi, Hardik
    Kothari, Dilipkumar
    Powiązania:
    https://bibliotekanauki.pl/articles/2055211.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bit error rate
    exponentiated weibull distribution
    free space optics
    FSO
    wavelingth diversity
    optimal combining
    Opis:
    Atmospheric turbulence is considered as major threat to Free Space Optical (FSO) communication as it causes irradiance and phase fluctuations of the transmitted signal which degrade the performance of FSO system. Wavelength diversity is one of the techniques to mitigate these effects. In this paper, the wavelength diversity technique is applied to FSO system to improve the performance under different turbulence conditions which are modeled using Exponentiated Weibull (EW) channel. In this technique, the data was communicated through 1.55 µm, 1.31 µm, and 0.85 µm carrier wavelengths. Optimal Combining (OC) scheme has been considered to receive the signals at receiver. Mathematical equation for average BER is derived for wavelength diversity based FSO system. Results are obtained for the different link length under different turbulence conditions. The obtained average BER results for different turbulence conditions characterized by EW channel is compared with the published result of average BER for different turbulence which is presented by classical channel model. A comparative BER analysis shows that maximum advantage of wavelength diversity technique is obtained when different turbulence conditions are modeled by EW channel.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 665--672
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FSO system performance analysis based on novel Gamma–Chi-square irradiance PDF model
    Autorzy:
    Todorović, Jelena
    Spalević, Petar
    Panić, Stefan
    Milosavljević, Bojana
    Gligorijević, Milan
    Powiązania:
    https://bibliotekanauki.pl/articles/2033970.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    free space optics
    FSO
    Gamma-Chi-square distribution
    atmospheric turbulence
    pointing error
    on-off keying
    OOK
    Opis:
    In order to provide a novel analytically traceable free space optics (FSO) channel model for describing turbulence based irradiance fluctuations, following basic scintillation theory principles, we have derived closed-form expression for probability density function (PDF) of a new statistical Gamma–Chi-square model. Further, capitalizing on provided model, error performances of FSO system over on-off keying (OOK) transmission scheme both in the presence of atmospheric turbulence and misalignment fading (pointing error) is investigated. For both cases, the average bit error rate (ABER) at the receiving side of the system is determined in an analytically closed form. The results are graphically presented in order to analyze the impact of different levels of turbulence, as well as other relevant parameters, on the quality of the received signal in the OOK modulated FSO system.
    Źródło:
    Optica Applicata; 2021, 51, 3; 335-348
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis of MPPM FSO transmission over Gamma–Chi-square strong atmospheric turbulence
    Autorzy:
    Todorovic, Jelena
    Spalevic, Petar
    Panic, Stefan
    Abdullah, Majid Hamid
    Pantelic, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2202766.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    FSO
    free space optics
    ABER
    average bit error rate
    MPPM
    multi-pulse pulse-position
    novel Gamma-Chi-square distribution
    channel model
    strong atmospheric turbulence
    Opis:
    In this paper, performance analysis of free space optical (FSO) system operating in conditions of strong atmospheric turbulence over Gamma–Chi-square turbulence model, has been carried out. We have observed reception over multi-pulse pulse-position (MPPM) modulation format for the case of strong atmospheric turbulence conditions modeled with Gamma–Chi-square turbulence model and have compared it with turbulence modeling distributions such are: Gamma–Gamma distribution, K-distribution, negative exponential distribution, log–normal distribution. First, we have provided closed-form analytical expressions for average bit error rate (ABER) at the reception for each observed case and then based on them, we have obtained numerical and Monte Carlo simulation results in order to observe turbulence level impact on system performance.
    Źródło:
    Optica Applicata; 2023, 53, 1; 111--126
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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