摘要
随着无线通信技术的发展,智能超表面(Reconfigurable Intelligent Surface, RIS)辅助通感一体化(Integrated Sensing and Communication, ISAC)技术越来越受到关注。针对RIS辅助ISAC系统中基站获取瞬时信道状态信息(Channel State Information, CSI)开销过大的问题,提出了一种利用统计CSI的联合波束成形设计方案。利用统计信道状态信息,分析了系统遍历速率的确定性等价式;在感知性能约束下,通过最大化该确定性等价式,提出了一种设计最优基站发送协方差矩阵和RIS对角相移矩阵的交替优化算法;仿真结果验证了所提方案的有效性,并揭示了通信与感知性能之间的折中关系。
With the development of wireless communication technology,Reconfigurable Intelligent Surface(RIS)and Integrated Sensing and Communication(ISAC)have attracted more and more attention.Aiming at the high cost of acquiring instantaneous channel state information in RIS-aided ISAC system,a joint beamforming design scheme based on statistical Channel State Information(CSI)is proposed.Firstly,the deterministic equivalent of the ergodic rate of the system is analyzed using statistical CSI.Then,by maximizing the deterministic equivalence under the perceived performance constraints,an alternate optimization algorithm is proposed to design the optimal base station transmission covariance matrix and RIS diagonal phase shift matrix.Finally,simulation results validate the effectiveness of the proposed scheme and reveal the tradeoff between communication and perceptual performance.
作者
王宇哲
刘一龙
张军
WANG Yuzhe;LIU Yilong;ZHANG Jun(Portland Institute,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)
出处
《无线电通信技术》
北大核心
2024年第2期328-333,共6页
Radio Communications Technology
基金
国家自然科学基金(62071247)。
