Future wireless networks have requirements of large connections, low power consumption, high reliability, and strong security. Considering the abundant available bandwidth of millimeter wave (mmWave) and the large line-of-sight (LOS) link probability of air–ground channel, in this article, we develop a framework to study security, reliability and energy coverage performance of the downlink mmWave simultaneous wireless information and power transfer (SWIPT) unmanned aerial vehicle (UAV) networks under nonorthogonal multiple access (NOMA) and orthogonal multiple access (OMA) schemes, where a UAV serves two types of authorized Internet of Things (IoT) devices in the presence of multiple passive eavesdroppers. Directional modulation (DM) is also used to improve the physical layer security (PLS) performance. First, the analytical expressions for connection outage probability (COP), secrecy outage probability (SOP), and effective secrecy throughput (EST) of the users with high rate security requirement (HRSR) under NOMA and OMA schemes are derived using stochastic geometry. Then, we optimize the active antenna selection of DM using adaptive genetic simulated annealing algorithm (AGSA) to further improve the secrecy performance based on the obtained analytical results. Finally, the closed-form expressions for the COP and energy-information coverage probability (EICP) of the energy-constrained users with low-rate requirement (ECLR) under NOMA and OMA schemes are obtained. The numerical and simulation results provide interesting insights into the influence of various parameters on the tradeoff between the reliability and security for the HRSR user, and the tradeoff between the reliability and energy coverage for the ECLR user. Moreover, the EST of the NOMA scheme outperforms OMA at low transmit power and high codeword transmission rate.

中文翻译：

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NOMA辅助毫米波SWIPT UAV网络中的安全通信

未来的无线网络具有连接量大，功耗低，可靠性高和安全性强的要求。考虑到毫米波（mmWave）的丰富可用带宽和空地信道的大视线（LOS）链接概率，在本文中，我们开发了一个框架来研究下行链路的安全性，可靠性和能量覆盖性能在非正交多路访问（NOMA）和正交多路访问（OMA）方案下的毫米波同时无线信息和功率传输（SWIPT）无人机（UAV）网络，其中，UAV在以下两种情况下为两种类型的授权物联网（IoT）设备提供服务：存在多个被动窃听者。定向调制（DM）也用于提高物理层安全性（PLS）性能。第一的，使用随机几何推导了NOMA和OMA方案下具有高速率安全要求（HRSR）的用户的连接中断概率（COP），保密中断概率（SOP）和有效保密吞吐量（EST）的解析表达式。然后，基于获得的分析结果，我们使用自适应遗传模拟退火算法（AGSA）优化DM的有源天线选择，以进一步提高保密性能。最后，获得了在NOMA和OMA方案下低费率需求受限的用户的COP和能量信息覆盖概率（EICP）的闭式表达式。数值和模拟结果为HRSR用户在可靠性和安全性之间权衡取舍时，各种参数的影响提供了有趣的见解，以及ECLR用户在可靠性和能量覆盖范围之间的权衡。此外，在低发射功率和高码字传输速率下，NOMA方案的EST优于OMA。