Multicast Secrecy Rate Maximization for Reconfigurable Intelligent Surface Backscatter Communication

被引:12
作者
Wang, Jinming [1 ]
Xu, Sai [2 ]
Han, Shuai [1 ]
Li, Jingtao [3 ,4 ]
机构
[1] Harbin Inst Technol, Sch Elect & Informat Engn, Harbin 150001, Peoples R China
[2] Univ Sheffield, Dept Elect & Elect Engn, Sheffield S1 4ET, England
[3] Beijing Inst Technol, Beijing 100811, Peoples R China
[4] China Acad Space Technol, Inst Telecommun & Nav Satellites, Beijing 100048, Peoples R China
基金
欧盟地平线“2020”; 中国国家自然科学基金;
关键词
Reconfigurable intelligent surface; backscatter; multicast secrecy rate; alternative optimization; TRANSMISSION; SYSTEMS; ROBUST; SIGNAL;
D O I
10.1109/LCOMM.2022.3208018
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
This letter innovatively studies a reconfigurable intelligent surface (RIS) backscatter multicast secrecy communication system. In this system, a RIS acts as a transmitter to multicast confidential information for multiple single-antenna legitimate users by the backscatter of the radio frequency signal from a power beacon (PB), while multiple passive multi-antenna eavesdroppers lurking nearby attempt to intercept and recognize the confidential information with linear decoders. To maximize the multicast secrecy rate, we develop an alternative algorithm to optimize the reflection matrix at the RIS and the beamforming vector at the PB under the constraints of total transmit power and unit modulus. Simulation results verify the feasibility of the considered system and show the achievable secrecy performance of the proposed optimization scheme.
引用
收藏
页码:2855 / 2859
页数:5
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