Abstract: In order to improve the communication quality between unmanned aerial vehicle (UAV) and ground users, an UAV communication system model based on full-duplex and non-orthogonal multiple access (FD-NOMA) technology is proposed, and the capacity of the system model in urban and suburban scenarios are analyzed. Firstly, the accurate capacity expression of the system model is given. Secondly, the calculation problem of the exponential integral function in the formula is solved by introducing the Q function and the truncation method, and the approximate closed-form expression of the capacity is obtained. Thirdly, in urban scenarios, the coefficient factor is used to obtain a more accurate approximate closed-form expression. Finally, simulation and numerical results show that rice factor has a certain influence on the system capacity, and increasing the number of UAV or NOMA power vector can achieve better capacity performance.

Key words: UAV communication, full-duplex(FD), non-orthogonal multiple access(NOMA), capacity analysis ,