Investigations on OFDM-FSO transmission system for UAV-to-Ground Links

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Abstract The seamless deployment of 5G and beyond future wireless networks requires ultra-high information rate, cost-efficient, easily deployable and scalable, front-haul and backhaul framework. Motivated by the growing interest in the application of unmanned aerial vehicles (UAV) to boost conventional cellular mobile networks' coverage and performance, this article proposes a UAV-to-ground terminal communication link based on free-space optics (FSO) technology for front-haul and backhaul network traffic. To enhance the system's traffic carrying capacity, robustness, and spectral efficiency, we propose the integration of orthogonal-frequency division multiplexing (OFDM) in the proposed framework. 20 Gbps 4-ary quadrature amplitude modulated (4-QAM) data signal is transmitted over varying channel conditions. The proposed framework performance is investigated for increasing the range of transmission and divergence angle of the beam. The simulations demonstrate that the proposed 4-QAM-OFDM-FSO framework can provide high information transmission rate for front-haul and backhaul traffic and can be a viable solution for the emerging needs of 5G wireless networks.

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