RIS辅助双功能雷达与隐蔽通信系统性能优化  

Performance optimization of RIS assisted dual-function radar and covert communication system

作　　者：胡浪涛 杨瑞 黄崇文 刘全金 吴磊 谭镇坤 HU Lang-tao;YANG Rui;HUANG Chong-wen;LIU Quan-jin;WU Lei;TAN Zhen-kun(School of Electronic Engineering and Intelligent Manufacturing,Anqing Normal University,Anqing 246133,China;College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]安庆师范大学电子工程与智能制造学院,安徽安庆246133 [2]浙江大学信息与电子工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2023年第12期2533-2543,共11页Journal of Zhejiang University：Engineering Science

基　　金：国家重点研发计划资助项目(2021YFA1000500);国家自然科学基金资助项目(62101492);浙江省杰出青年基金资助项目(LR22F010002)。

摘　　要：针对智能超表面(RIS)辅助双功能雷达与通信(DFRC)系统的隐蔽传输问题,提出多策略交替优化(MSAO)算法.在隐蔽约束、雷达恒模约束和总功率约束的条件下,通过联合设计通信波束赋形向量、雷达信号协方差矩阵和RIS相位偏转矩阵,最大化合法用户Bob的隐蔽通信速率和目标探测功率,实现隐蔽通信和雷达感知功能的折中.在完美Willie信道状态信息和不完美Willie信道状态信息场景下,仿真结果表明,相对于传统单连接RIS和没有部署RIS系统,采用广义全连接模式部署RIS可以更好地传输波束方向图,提高Bob隐蔽通信速率上限,扩大可实现速率的范围,实现通信和感知功能更大的自由度.A multi strategy alternating optimization(MSAO)algorithm was proposed for covert transmission of the reconfigurable intelligence surface(RIS)assisted dual-function radar and communication(DFRC)system.Under the conditions of covert constraints,radar constant modulus constraints and total power constraints,the communication beamforming vector,radar signal covariance matrix and RIS phase shift matrix were jointly designed to maximize the legitimate user Bob’s covert communication rate and probing power at target,in order to achieve a tradeoff between covert communication and radar sensing.In both the perfect and imperfect Willie’s channel state information scenarios,the simulation results show that deploying RIS in a generalized fully connected mode can better transmit beamforming maps,increase the upper limit of Bob’s covert communication rate,expand the achievable range of rates,and achieve greater freedom in communication and sensing functions compared to traditional single connected RIS and systems without RIS deployment.

关 键 词：波束赋形设计 隐蔽通信 双功能雷达与通信(DFRC) 智能超表面(RIS) 广义全连接RIS 

分 类 号：TN929.5[电子电信—通信与信息系统]