Hovering Drones-Based FSO Technology In Weak Atmospheric Turbulence With Pointing Error

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 H
P
factor. The idea was to find the specific values of the pointing error angle $\theta_{\mathrm{r}}$ and link distance Z that are the related parameters of H
P
. The results have clarified that for each pointing error angle $\theta_{\mathrm{r}}$ value, there was a specific path length Z, which can keep the system at high performance, for example, $\theta_{\mathrm{r}}=10^{-3}{\mathrm {rad}}$, the applicable link distance $Z={\mathrm {1000m}}$, and the ${\mathrm {ABER}}\approx 10^{-8}$