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The use of unmanned aerial vehicle base stations (UAV-BSs) as airborne basestations has recently gained great attention. In this paper, we model a networkof UAV-BSs as a Poisson point process (PPP) operating at a certain altitudeabove the ground users. We adopt an air-to-ground (A2G) channel model thatincorporates line-of-sight (LoS) and non-line-of-sight (NLoS) propagation.Thus, UAV-BSs can be decomposed into two independent inhomogeneous PPPs. Underthe assumption that NLoS and LoS channels experience Rayleigh and Nakagami-mfading, respectively, we derive approximations for the coverage probability andaverage achievable rate, and show that these approximations match thesimulations with negligible errors. Numerical simulations have shown that thecoverage probability and average achievable rate decrease as the height of theUAV-BSs increases.

Coverage and Rate Analysis for Unmanned Aerial Vehicle Base Stations with LoS/NLoS Propagation