Secrecy Analysis of UAV-Assisted RIS-Enhanced Uplink NOMA Systems

InNon-Orthogonal Multiple Access (NOMA) this paper, we consider an Unmanned aerial vehicle (UAV)Unmanned Aerial Vehicle (UAVs)-assisted reconfigurable intelligent surface (RIS)-enhanced uplink non-orthogonal multiple access (NOMA)Non-Orthogonal Multiple Access (NOMA) communication system, where users (UEs) want to transmit confidential information to the UAV in the presence of an eavesdropper. We evaluate the impact of transmit power on secrecy rateSecrecy rate with continuous and discrete phase shifts at RISReconfigurable Intelligent Surface (RIS) under Rayleigh fading channels. The simulation results reveal that the secrecy rateSecrecy rate increases with the increase in the transmit power of UEs and discrete phase shift at RISReconfigurable Intelligent Surface (RIS) degrades the system performance.