Securing Reconfigurable Intelligent Surface-Aided Cell-Free Networks

被引:33
作者
Hao, Wanming [1 ]
Li, Junjie [2 ]
Sun, Gangcan [3 ]
Zeng, Ming [4 ]
Dobre, Octavia A. [5 ]
机构
[1] Zhengzhou Univ, Sch Elect & Informat Engn, Zhengzhou 450001, Peoples R China
[2] Zhengzhou Univ, Henan Inst Adv Technol, Zhengzhou 450001, Peoples R China
[3] Zhengzhou Univ, Inst Ind Technol, Zhengzhou 450001, Henan, Peoples R China
[4] Univ Laval, Dept Elect Engn & Comp Engn, Quebec City, PQ G1V 0A6, Canada
[5] Mem Univ, Fac Engn & Appl Sci, St John, NL A1B 3X5, Canada
关键词
Security; Optimization; Electronic mail; Energy consumption; Wireless communication; Sun; Matrix decomposition; Cell-free network; reconfigurable intelligent surface (RIS); physical layer security; weighted sum secrecy rate; SECRECY RATE MAXIMIZATION; PHYSICAL LAYER SECURITY; REFLECTING SURFACE; WIRELESS COMMUNICATION; DESIGN;
D O I
10.1109/TIFS.2022.3212204
中图分类号
TP301 [理论、方法];
学科分类号
081202 ;
摘要
In this paper, we investigate the physical layer security in the reconfigurable intelligent surface (RIS)-aided cell-free networks. A maximum weighted sum secrecy rate problem is formulated by jointly optimizing the active beamforming (BF) at the base stations and passive BF at the RISs. To handle this non-trivial problem, we adopt the alternating optimization to decouple the original problem into two sub-ones, which are solved using the semidefinite relaxation and continuous convex approximation theory. To decrease the complexity for obtaining overall channel state information (CSI), we extend the proposed framework to the case that only requires part of the RIS' CSI. This is achieved via deliberately discarding the RIS that has a small contribution to the user's secrecy rate. Based on this, we formulate a mixed integer non-linear programming problem, and the linear conic relaxation is used to obtained the solutions. Meanwhile, we also study the system performance under the imperfect CSI. Finally, the simulation results show that the proposed schemes can obtain a higher secrecy rate than the existing ones.
引用
收藏
页码:3720 / 3733
页数:14
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