Enhancing physical layer security via a UAV friendly jammer for NOMA‐based IoT systems with imperfect CSI,Transactions on Emerging Telecommunications Technologies

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Enhancing physical layer security via a UAV friendly jammer for NOMA‐based IoT systems with imperfect CSI
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2021-01-13 , DOI: 10.1002/ett.4175
Yang Chen ₁ , Zhongpei Zhang ₁ , Binrui Li ₁

Affiliation

In this article, we investigate physical layer security in downlink Internet of Things networks under imperfect channel state information (CSI), in which a controller (Alice) intends to serve two user devices (D₁ and D₂) simultaneously by using nonorthogonal multiple access (NOMA). Cooperative jamming (CJ) is introduced as a powerful solution for guaranteeing secure transmission. To be specific, we integrate an unmanned aerial vehicle (UAV) jammer that generates artificial noise to confuse multiple noncolluding eavesdroppers (Eves). Considering only D₁ requires secure transmission, we develop an adaptive power allocation scheme to maximize the secrecy rate at D₁ while meeting the desired quality of service (QoS) threshold at D₂. Furthermore, a strategy can be utilized to obtain the optimal location of the UAV jammer is derived for further performance enhancement. Besides, we also examine the impact of the channel uncertainties on system performance. Numerical results are provided to confirm the superiority and applicability of the proposed CJ scheme over benchmark schemes in terms of secrecy performance and effective energy efficiency.

中文翻译：

通过UAV友好干扰器增强物理层的安全性，以用于具有不完善CSI的基于NOMA的物联网系统

在本文中，我们研究信道状态信息（CSI）不完美的情况下下行链路物联网网络的物理层安全性，其中控制器（Alice）打算通过使用非正交多路访问同时服务两个用户设备（D ₁和D ₂）（NOMA）。引入合作干扰（CJ）作为一种强大的解决方案，可确保安全传输。具体来说，我们集成了无人飞行器（UAV）干扰器，该干扰器会产生人为噪声，以混淆多个无冲突的窃听者（Eves）。考虑到只有D ₁需要安全传输，因此我们开发了一种自适应功率分配方案，以使D ₁处的保密率最大化，同时满足D处的所需服务质量（QoS）阈值。₂。此外，可以利用一种策略来获得UAV干扰器的最佳位置，以进一步提高性能。此外，我们还研究了通道不确定性对系统性能的影响。提供的数值结果证实了在保密性能和有效能效方面，所提出的CJ方案优于基准方案的优越性和适用性。

更新日期：2021-03-15

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