Cooperative Jamming for Secure UAV-Enabled Mobile Relay System
Cooperative Jamming for Secure UAV-Enabled Mobile Relay System
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DOI：
10.1109/access.2020.2980242
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发表时间：
2020-03
期刊：
影响因子：
3.9
通讯作者：
Jiansong Miao;Ziyuan Zheng
中科院分区：
文献类型：
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作者：
Jiansong Miao;Ziyuan Zheng
由于空地视距通信链路的存在，无人机集成的无线系统中的安全威胁是具有挑战性的。在支持无人机的移动中继系统中，从物理层安全的角度提出了一种新的协作通信方案来解决该安全问题。具体地说，在使用无人机中继在两个地面用户之间转发机密信息的移动中继系统中，地面上存在窃听者监听中继无人机。为了提高系统的安全性能，我们引入了一种友好的无人机干扰机来发射干扰信号，迷惑窃听者。在满足机动性约束、两个无人机的功率约束和中继无人机的信息因果约束的条件下，建立了保密率最大化问题。为了解决变量紧耦合的非凸优化问题，我们将问题分解为更容易处理的子问题。因此，提出了一种迭代算法，通过更新率辅助的块坐标下降和逐次凸逼近技术交替优化两架无人机的发射功率和飞行轨迹。仿真结果表明，与基准方案相比，所提出的协作设计能够显著提高无人机支持的移动中继系统的保密率。
Due to the air-to-ground line-of-sight communication links, it is challenging to deal with the security threats in the wireless system with unmanned aerial vehicles (UAVs) integrated. In a UAV-enabled mobile relay system, the paper proposes a novel cooperative communication scheme from a physical layer security perspective to address the security issue. Specifically, in a mobile relay system where a UAV relay is employed to forward confidential information between two ground users, an eavesdropper exists on the ground wiretapping the relay UAV. To enhance the security performance of the system, we introduce a friendly UAV jammer transmitting interference signals and confusing the eavesdropper. A secrecy rate maximization problem is then formulated, subject to mobility constraints, power constraints on both UAVs and the information-causality constraint on the relay UAV. To solve the non-convex optimization problem with closely coupled variables, we decouple the problem into more tractable subproblems. An iterative algorithm is thus proposed to optimize the transmit power and flight trajectory of both UAVs alternately via the update-rate-assisted block coordinate descent and successive convex approximation techniques. Simulation results demonstrate that proposed cooperative design can significantly improve the secrecy rate of the UAV-enabled mobile relay system compared to benchmark schemes.