基于RSMA的IRS辅助认知无线网络安全波束成形方案  

A secure beamforming method for IRS-assisted cognitive radio networks based on RSMA

作　　者：吴雪雯 马竟宵 薛小平[1] 蔡强强 孔槐聪 林敏[2] WU Xuewen;MA Jingxiao;XUE Xiaoping;CAI Qiangqiang;KONG Huaicong;LIN Min(College of Electronic and Information Engineering,Tongji University,Shanghai 201804,China;School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]同济大学电子与信息工程学院,上海201804 [2]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2024年第6期25-34,共10页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：上海市科技创新计划(21DZ1200702)资助项目。

摘　　要：研究对象为一种结合了认知无线电网络、智能反射面(Intelligent Reflecting Surface,IRS)以及速率分割多址(Rate Splitting Multiple Access,RSMA)技术的IRS辅助的认知无线网络,通过充分利用IRS和RSMA的优势,该网络展现了在提高频谱效率方面的潜在巨大优势。然而,该网络容易受到安全问题的困扰,多用户共享相同频谱会增加干扰和隐私泄露的风险。为实现频谱效率和安全效率的联合考量,提出了基于RSMA的主次网络联合安全波束成形设计方法,以充分利用次用户产生的干扰,来抑制潜在窃听者,并在安全和能效之间取得平衡。在此框架下,研究了考虑多种约束条件下的主用户安全能效优化问题,并通过交替迭代波束成形的设计方案,结合连续凸近似和泰勒展开方法,实现了有效求解。该方法在基于RSMA的IRS辅助的认知无线网络中能充分利用次网络发射机的干扰,以提升主网络的安全性能,最终通过联合安全波束成形设计,实现了传输效率和安全性能的有效权衡。An intelligent reflecting surface(IRS)-assisted cognitive radio network that combines cognitive radio network,IRS,and rate splitting multiple access(RSMA)technology has been investigated.This network exhibits huge potential in improving the spectral efficiency by fully utilizing the advantages of IRS and RSMA.However,this network is susceptible to security issues,for example,multiple users share the same spectrum,and the interference and privacy can be high-likely breached.Considering both the spectrum efficiency and security efficiency,we propose a joint secure beamforming design method for primary and secondary networks based on RSMA.This method makes full use of the interference generated by secondary users to suppress potential eavesdroppers and achieves the balance between the security efficiency and energy efficiency.Under this framework,the primary user secrecy energy efficiency optimization problem is studied with various constraints,and an effective solution is achieved through the alternating iterative algorithm combined with the continuous convex approximation and the Taylor expansion method.This method can make full use of the interference of the secondary network transmitter in the IRS-assisted cognitive radio network based on RSMA,and thus improve the security performance of the primary network.The joint secure beamforming design can achieve the trade-off between the transmission efficiency and the security performance.

关 键 词：波束成形 速率分割多址 智能反射面 安全能效 

分 类 号：TN92[电子电信—通信与信息系统]