基于FD-NOMA的无人机通信系统容量分析

为了提高无人机与地面用户的通信质量，提出了一种基于全双工和非正交多址接入技术的无人机通信系统模型，并分析了城市和郊区两种场景下该系统模型的遍历容量。首先，推导出两种场景下该系统模型的精确容量表达式；然后，通过引入Q函数和利用截断方法解决了式中指数积分函数的计算问题，得到了容量的近似闭式表达式，并在城市场景下，采用取系数因子的方法得到了更精确的容量近似闭式表达式；最后，仿真和数值结果表明，莱斯因子对系统容量存在一定影响，增加无人机数量或非正交多址接入功率向量都可以获得更好的容量性能。

Capacity analysis of UAV communicationsystem based on FD-NOMA

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.