Joint power allocation and relay selection scheme in untrusted UAV relays system

In order to solve the security problem in the downlink untrusted UAV multi-relay system, a joint power allocation and relay selection scheme with hardware impairment is proposed. In this scheme, cooperative jamming technology is applied to the untrusted UAV relay system. Firstly, the power allocation coefficient of artificial noise used for cooperative jamming at the source node is optimized, and then the UAV relay selection is carried out under this condition to maximize the system security capacity. According to the model analysis, the secrecy performance of the system is analyzed from the perspective of the ergodic secrecy rate and secrecy outage probability, and the Monte Carlo simulations are carried out to verify the effectiveness of the proposed scheme by comparing with the traditional power allocation and relay selection schemes.