  In this paper, we study the performance of multiple reconfigurable
intelligent surfaces (RISs)-aided unmanned aerial vehicle (UAV) communication
networks over Nakagami-$m$ fading channels. For that purpose, we used accurate
closed-form approximations for the channel distributions to derive closed-form
approximations for the outage probability (OP), average symbol error
probability (ASEP), and the average channel capacity assuming independent
non-identically distributed (i.ni.d.) channels. Furthermore, we derive the
asymptotic OP at the high signal-to-noise ratio (SNR) regime to get more
insights into the system performance. We also study some practical scenarios
related to RISs, UAV, and destination locations and illustrate their impact on
the system performance through simulations. Finally, we provide an optimization
problem on the transmit power of each channel.
