| 摘要: |
| 对于可重构智能表面(Reconfigurable Intelligent Surface,RIS)辅助速率拆分多址接入(Rate Splitting Multiple Access,RSMA)系统，收发机硬件损伤(Hardware Impairments,HIs)极可能大幅降低安全性能。针对此问题，以提高系统资源利用效率为目标，考虑用户保密速率公平性，提出一种HIs下RIS辅助RSMA系统最小安全速率最大化方案。使用交替优化、辅助变量替换、半定规划及半正定松弛等方法，联合优化发射预编码向量、公有信息安全速率分配及RIS相移，以最大化用户最小安全速率。仿真结果表明，在相同HIs情况下，与基准传输方案相比，所提传输优化方案至少可使系统最小安全速率提升5.65%，且能在保障用户保密速率公平性的同时提升系统抗HIs能力和保密性能。 |
| 关键词: 〖JP2〗速率拆分多址接入(RSMA) 可重构智能表面(RIS) 硬件损伤 保密速率公平性 物理层安全〖JP〗 |
| DOI：10.20079/j.issn.1001-893x.231101002 |
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| 基金项目:国家自然科学基金资助项目（61831002,61901075） |
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| Max-Min Secure Rate for RIS-aided RSMA Systems with Hardware Impairments |
| DENG Bingguang,WU Zhipan,FENG Linlin,ZHANG Zhizhong |
| (1.School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;2.School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China) |
| Abstract: |
| The hardware impairments(HIs) in the transceiver significantly degrade the security performance of the reconfigurable intelligent surfaces(RIS)-aided rate splitting multiple access(RSMA) systems.To address this issue,an optimized scheme is proposed to maximize the minimum secure rate in HIs-affected RIS-aided RSMA systems,aiming to improve the efficiency of transmission resource utilization and the users secure rate fairness.The optimization is performed by using convex optimization techniques such as alternating optimization,auxiliary variable substitution,semidefinite program and semidefinite relaxation,which jointly optimize the transmit precoding vectors,secure rate allocation for common information,and RIS phase shifts to maximize the users minimum secure rate.Simulation results demonstrate that,compared with the RIS-aided SDMA scheme,the proposed scheme can increase a minimum of 5.65% of the minimum security rate under the same HIs case,and can improve the system搒 HIs resistance and secrecy performance while guaranteeing the users secure rate fairness. |
| Key words: rate splitting multiple access(RSMA) reconfigurable intelligent surface(RIS) hardware impairments secure rate fairness physical layer security |
