Secure Multigroup Multicast Communication Systems via Intelligent Reflecting Surface  

作　　者：Weiping Shi Jiayu Li Guiyang Xia Yuntian Wang Xiaobo Zhou Yonghui Zhang Feng Shu 

机构地区：[1]School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]School of Information and Communication Engineering,Hainan University,Haikou 570228,China [3]School of Physics and Electronic Engineering,Fuyang Normal University,Fuyang 236037,China [4]School of Electronic and Electrical Engineering,Shangqiu Normal University,Shangqiu 476000,China

出　　处：《China Communications》2021年第3期39-51,共13页中国通信（英文版）

基　　金：supported in part by the National Natural Science Foundation of China under Grants 62071234,61901121 and 61771244;in part by the Natural Science Research Project of Education Department of Anhui Province of China under Grant KJ2019A1002.

摘　　要：This paper considers a secure multigroup multicast multiple-input single-output(MISO)communication system aided by an intelligent reflecting surface(IRS).Specifically,we aim to minimize the transmit power at Alice via jointly optimizing the transmit beamformer,artificial noise(AN)vector and phase shifts at the IRS subject to the secrecy rate constraints as well as the unit modulus constraints of IRS phase shifts.To tackle the optimization problem,we first transform it into a semidefinite relaxation(SDR)problem,and then alternately update the transmit beamformer and AN matrix as well as the phase shifts at the IRS.In order to reduce the high computational complexity,we further propose a low-complexity algorithm based on second-order cone programming(SOCP).We decouple the optimization problem into two sub-problems and optimize the transmit beamformer,AN vector and the phase shifts alternately by solving two corresponding SOCP subproblem.Simulation results show that the proposed SDR and SOCP schemes require half or less transmit power than the scheme without IRS,which demonstrates the advantages of introducing IRS and the effectiveness of the proposed methods.

关 键 词：intelligent reflecting surface multigroup multicast transmit beamformer secrecy rate phase shifts 

分 类 号：TN929.5[电子电信—通信与信息系统]