论文标题
无人机安全下行链路Noma Transmissions：一个安全的用户透视图
UAV Secure Downlink NOMA Transmissions: A Secure Users Oriented Perspective
论文作者
论文摘要
本文提出了一个安全的下行链路多用户传输方案，该方案由灵活的无人驾驶汽车基站（UAV-BS）和非正交多访问（NOMA）启用。根据他们的异质服务要求，多个合法用户被归类为安全款项用户（SUS）和服务质量（QoS）所需的用户（QUS），而这些QU可以可能充当内部窃听器，这些窃听者对SUS的分离式传输感到好奇。在这种情况下，我们的目标是通过对用户调度，功率分配和轨迹设计的联合优化，最大化SUS之间可实现的最低保密率，但遵守QUS的QUS要求和UAV-BB的移动性约束。由于问题的非跨性别性，首先根据替代优化（AO）和连续的凸近似（SCA）方法提出了有效的迭代算法，并与基于惩罚的算法以及一种基于惩罚的算法来处理引入的二进制整数变量，以获得次级测试解决方案。然后，我们通过利用优化问题的固有特征来提出一种面向SUS的低复杂性算法，该算法可以有效地降低计算复杂性，并可以作为先前迭代算法的合理初始解决方案，以实现更好的性能。最后，与常规的正交多访问（OMA）相比，我们提出的方案的优越性通过数值仿真结果验证。
This paper proposes a secure downlink multi-user transmission scheme enabled by a flexible unmanned aerial vehicle base station (UAV-BS) and non-orthogonal multiple access (NOMA). According to their heterogeneous service requirements, multiple legitimate users are categorized as security-required users (SUs) and quality of service (QoS)-required users (QUs), while these QUs can potentially act as internal eavesdroppers which are curious about the secrecy transmissions of SUs. In such a context, our goal is to maximize the achievable minimum secrecy rate among SUs through the joint optimization of user scheduling, power allocation, and trajectory design, subject to the QoS requirements of QUs and the mobility constraint of UAV-BS. Due to the non-convexity of the problem, an efficient iterative algorithm is firstly proposed, based on the alternative optimization (AO) and successive convex approximation (SCA) methods and along with a penalty-based algorithm to deal with the introduced binary integer variables, to obtain a sub-optimal solution. Then, we propose an SUs-oriented low-complexity algorithm by taking advantage of the inherent characteristics of the optimization problem, which can efficiently reduce the computational complexity and can act as a reasonable initial solution for the previous iterative algorithm to achieve better performance. Finally, the superiority of our proposed scheme compared with the conventional orthogonal multiple access (OMA) one is validated by numerical simulation results.
