Secure Beamforming for Full-Duplex MIMO Two-Way Untrusted Relay Systems
Secure Beamforming for Full-Duplex MIMO Two-Way Untrusted Relay Systems
复制标题
DOI：
10.1109/tifs.2020.3001733
复制
发表时间：
2020-06
影响因子：
6.8
通讯作者：
Shuangrui Zhao;Jia Liu;Yulong Shen;Xiaohong Jiang;N. Shiratori
中科院分区：
文献类型：
--
作者：
Shuangrui Zhao;Jia Liu;Yulong Shen;Xiaohong Jiang;N. Shiratori
以全双工多输入多输出双向非可信中继系统为研究对象，研究了基于物理层安全技术的系统波束形成优化设计，使系统的保密和率（SSR）最大化。首先给出了一般波束形成设置下的SSR系统建模，并给出了最优波束形成设计问题的理论公式。基于全信道状态信息可用的理想假设，我们建立了一个新的理论框架来解决最优设计问题，从而建立了SSR的上界，其中交替优化、分数规划、半确定规划和障碍函数方法联合使用。考虑到实际实现中的约束条件，我们进一步提出了基于维纳预测和渐近逼近的两种次优波束形成设计方案。本文还讨论了如何降低中继波束形成优化设计中的计算复杂度问题。最后，我们给出了大量的数值结果来说明我们的理论发现，并证明了所提出的次优波束形成设计方案的性能。
This paper focuses on a full-duplex multiple-input multiple-output two-way untrusted relay system, and investigates the optimal beamforming design of such system to maximize its secrecy sum rate (SSR) based on the physical layer security technology. We first provide the modeling of SSR under a general beamforming setting as well as the theoretical formulation of the optimal beamforming design problem. Based on the ideal assumption that the full channel state information is available, we then develop a novel theoretical framework to solve the optimal design problem and thus establish an upper bound on SSR, where the techniques of alternate optimization, fractional programming, semi-definite programming and barrier function method are jointly employed. With the consideration of the constraints in practical implementations, we further propose two sub-optimal beamforming design solutions based on either Wiener prediction or asymptotic approximation. The issue of how to reduce the computational complexity in the optimal relay beamforming design is also discussed in this paper. Finally, we present extensive numerical results to illustrate our theoretical findings and to demonstrate the performance of the proposed sub-optimal beamforming design solutions.