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Because of its high directivity, free-space optical (FSO) communicationoffers a number of advantages. It can, however, give rise to major systemdifficulties concerning alignment between two terminals. During thelink-acquisition step (a.k.a. coarse pointing), a ground station can beprevented from acquiring optical links due to pointing errors and insufficientinformation about unmanned aerial vehicle locations. We propose, in thisletter, a radio-frequency (RF) lens antenna array to increase the performanceof coarse pointing in hybrid RF/FSO communications. The proposed algorithmusing a novel closed-form angle estimator, compared to conventional methods,reduces the minimum outage probability by over a thousand times.

RF Lens Antenna Array-Based One-Shot Coarse Pointing for Hybrid RF/FSO Communications