Yazar "Mahdi, Abdullah Jameel" seçeneğine göre listele

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    Öğe
    Hovering drones-based FSO technology in weak atmospheric turbulence with pointing error
    (IEEE, 2021) Mahdi, Abdullah Jameel; Mazher, Jalil; Uçan, Osman Nuri
    The rapid development of drones that are a type of Unmanned Arial Vehicles (UAV) in different fields encourages researchers and institutes concern with wireless communication to use this technology. As wireless optical communication (OWC) has been applied and has many advantages over Radio Frequency (RF), this enables using the optical beam in UAV-based Free-space optical (FSO) technology as an alternative to RF technology. In this paper, the proposed system configuration has two subsystems: Single Input-Single Output (SISO) and Multiple Input-Single Output (MISO). The system was simulated using MATLAB software 2020. The optical signal was modulated using Pulse Position Modulation (PPM) and transmitted in a weak turbulence regime. The Average Bit error Rate (ABER) was measured depending on the pointing error HP factor. The idea was to find the specific values of the pointing error angle θr and link distance Z that are the related parameters of HP. The results have clarified that for each pointing error angle θr value, there was a specific path length Z, which can keep the system at high performance, for example, θr= rad, the applicable link distance Z=1000 m, and the ABER≈ .
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    Öğe
    Impact of pointing error on SISO/MISO drones swarm-based free space optical system in weak turbulence regime
    (Indonesian Journal of Electrical Engineering and Computer Science, 2021) Mahdi, Abdullah Jameel; Mazher, Wamidh Jalil; Uçan, Osman Nuri
    Applying the drone-based free space optical (FSO) technology is recent in communication systems. The FSO technology has high-security features due to narrow beamwidth, insusceptible to interferences, free license, and landline connection is not appropriate. However, these advantages face many obstacles that affect the system's performance, such as random weather conditions and misalignment. The pointing error Hp is one of the critical factors of the channel gain H. The related parameters of the Hp factor: the pointing error angles θr and the path length Z, were manipulated to extract the applicable values at various receiver diameter values. The proposed system has two topologies: single input single output (SISO) and multiple input single output (MISO), flying in weak atmospheric turbulence. The simulation was done using MATLAB software 2020. The average bit error rate (ABER) for the system versus signal-to-noise ratio (SNR) were verified and analyzed. The results showed that at θr=10−3 rad, Z increased in the range 10~100m for each one-centimeter increase of DR. At θr=10−2 rad, the applicable Z was nearly 10% of the link distance Z when θr=10−3 rad was applied. Consequently, an increase in θr must correspond decrease in Z and vice versa to maintain the system at high performance.
  • [ X ]
    Öğe
    Parameter optimization for hovering multi-rotor drones-based free-space optical links
    (Applied Nanoscience, 2021) Mahdi, Abdullah Jameel; Mazher, Wamidh Jalil
    Multi-rotor (MR) Drones have recently emerged as a viable method for creating fexible free-space optical (FSO) connections. In this study, we look at how precise parameters optimization can be used to evaluate the benefts of using MR Drones for such nanometer links, with consideration of the combined efect of atmospheric turbulence along with pointing error factor hp. The related parameters of hp are the connection distance d and pointing error angle (PEA) θ. In contrast to past studies on the subject, this one increased the connection distance d between drones swarm for high values PEAs that had been got high Bit Error Rate (BER). The system consists of two channels type: Single Input–Single Output (SISO) and Multiple Input–Single Output (MISO), and was simulated using MATLAB 2020. The results showed that for PEA θ=10−3 and 10−2 rad, the connection distance d increased from 5 to 20 percent per one centimeter increasing in the receiver diameter Dr, and for PEA θ=10−1 rad, the connection distance d increased few meters; therefore, it is not recommended to increase the receiver diameter.