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The integration of unmanned aerial vehicles (UAVs) into the terrestrialcellular networks is envisioned as one key technology for next-generationwireless communications. In this work, we consider the physical layer securityof the communications links in the millimeter-wave (mmWave) spectrum which aremaintained by UAVs functioning as base stations (BS). In particular, we proposea new precoding strategy which incorporates the channel state information (CSI)of the eavesdropper (Eve) compromising link security. We show that our proposedprecoder strategy eliminates any need for artificial noise (AN) transmission inunderloaded scenarios (fewer users than number of antennas). In addition, wedemonstrate that our nonlinear precoding scheme provides promising secrecy-rateperformance even for overloaded scenarios at the expense of transmittinglow-power AN.

Precoder Design for mmWave UAV Communications with Physical Layer Security