IRS辅助的星地融合认知网络中断性能分析  

Outage performance analysis of IRS-aided cognitive satellite-terrestrial network

作　　者：林敏[1] 郭怀波 刘笑宇 韩略 谈苗苗 杨绿溪[2] LIN Min;GUO Huaibo;LIU Xiaoyu;HAN Lue;TAN Miaomiao;YANG Lyuxi(School of Communication and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;School of Information Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]东南大学信息科学与工程学院,江苏南京210096

出　　处：《通信学报》2023年第7期64-75,共12页Journal on Communications

基　　金：重点国际合作基金资助项目(No.61720106003);国家自然科学基金资助项目(No.61971128);南京邮电大学引进人才科研启动基金资助项目(No.NY220111);南京邮电大学校级自然科学基金资助项目(No.NY222114);江苏省研究生科研与实践创新计划基金资助项目(No.KYCX20_0724)。

摘　　要：分析了智能反射面(IRS)辅助的星地融合认知网络系统的中断性能。首先,针对卫星采用点波束技术服务地球站,而基站通过智能反射面扩大通信范围,并采用非正交多址接入(NOMA)技术服务多用户场景,在系统采用认知无线电技术来实现卫星主网络与地面次级网络之间频谱共享的情况下,建立以地面用户平均信干噪比最大化为目标的优化问题;其次,基于角度域的信道状态信息提出了一种低复杂度的IRS相移设计方案,从而得到智能反射面相移矩阵;接着,分别推导出地面用户在固定和移动2种情况下的中断概率闭合表达式。为了进一步分析系统性能,推导了高信噪比条件下系统的中断概率近似表达式。最后,计算机仿真验证了中断概率表达式的正确性,并分析了主要参数对系统性能的影响。The outage performance of intelligent reflecting surface(IRS)aided cognitive satellite-terrestrial network was analyzed.Firstly,for the scenario where the point beam was enabled at the satellite to serve the earth station,and the IRS and non-orthogonal multiple access(NOMA)were deployed at the base station to expand the communication range and serve multiple users,respectively,under the condition that cognitive radio technology was employed to enable spectrum sharing between the satellite primary network and the terrestrial secondary network,an optimization problem was established to maximize the average signal-to-noise ratio of terrestrial users.Secondly,a low complexity IRS phase shift design was proposed by using channel state information based on the angle domain,and the phase shift matrix of IRS was obtained.Then,the closed-form expressions of outage probabilities of terrestrial users were derived when users were static and moving,respectively.Furthermore,the asymptotic outage probability formulas at high signal-to-noise ratio were also derived to analyze the system performance.Finally,the correctness of derivation and the influence of main parameters on outage performance were verified by computer simulations.

关 键 词：星地融合认知网络 非正交多址接入 智能反射面 中断概率 

分 类 号：TN92[电子电信—通信与信息系统]