IRS辅助的MISO系统安全节能通信方案  

Secure and Energy-Efficient Communication Scheme for MISO Systems Assisted by Intelligent Reflecting Surfaces

作　　者：贾向东 张鑫[1] 尚通健 马小平 JIA Xiangdong;ZHANG Xin;SHANG Tongjian;MA Xiaoping(College of Computer Science and Engineering,Northwest Normal University,Lanzhou,Gansu 730070,China;Wireless Communication Key Lab of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China)

机构地区：[1]西北师范大学计算机科学与工程学院,甘肃兰州730070 [2]南京邮电大学江苏省无线通信重点实验室,江苏南京210003

出　　处：《信号处理》2024年第2期364-372,共9页Journal of Signal Processing

基　　金：国家自然科学基金(62261048,61861039)。

摘　　要：智能反射面(Intelligent Reflecting Surface,IRS)是提高未来B5G/6G网络安全节能通信的一项革命性技术。本文针对IRS辅助下行多输入单输出(Multiple Input Single Output,MISO)系统的高安全风险与高能耗问题,分析了发送端发射波束成形和IRS相移矩阵对系统安全节能通信的影响,构建合法用户保密率约束下的系统发射功率最小化问题。针对该非凸多变量耦合问题,提出一种基于逐次凸逼近(successive convex approximation,SCA)的二阶锥规划算法迭代求解问题。与传统迭代优化算法不同,该算法在每次迭代中同时更新所有优化变量,并最终获得原问题的次优解。仿真结果表明,相较于无IRS方案、随机相移方案与SDR迭代优化方案三种基准方案,所提算法均在保证合法用户保密质量的同时实现了更低的发射功率,证明了本文算法的有效性与IRS在未来安全节能通信系统中的巨大潜力。As an innovative 6G technology,an intelligent reflecting surface(IRS)can enhance the energy efficiency and security of future B5G/6G networks.Focusing on the high security risks and high energy consumption of IRS�assisted downlink multiple input single output systems,this study analyzed the impact of transmit beamforming and an IRS phase shift matrix on system security and energy-saving communication.Then,we considered a transmission power minimization problem under secrecy rate constraints.A second-order cone programming algorithm based on successive convex approximation was proposed to iteratively solve this non-convex multivariable coupling problem.In contrast to traditional iterative optimization algorithms,this algorithm simultaneously updated all the optimization variables in each iteration and finally obtained a suboptimal solution to the original problem.The findings from the simulations indicated that compared with the three benchmark schemes(the no-IRS scheme,random phase shift scheme,and SDR iterative optimization scheme),the algorithm proposed here achieved a lower transmission power while ensuring the confidentiality of legitimate users,which proved the effectiveness of the algorithm and great potential of IRSs in future secure and energy-saving communication systems.

关 键 词：智能反射面 波束成形 保密率 二阶锥规划 节能通信 

分 类 号：TN929.5[电子电信—通信与信息系统]