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浙江大学学报(工学版)
浙江大学学报(工学版)  2023, Vol. 57 Issue (12): 2533-2543    DOI: 10.3785/j.issn.1008-973X.2023.12.020
通信工程     
RIS辅助双功能雷达与隐蔽通信系统性能优化
胡浪涛1(),杨瑞1,黄崇文2,*(),刘全金1,吴磊1,谭镇坤1
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
Performance optimization of RIS assisted dual-function radar and covert communication system
Lang-tao HU1(),Rui YANG1,Chong-wen HUANG2,*(),Quan-jin LIU1,Lei WU1,Zhen-kun TAN1
1. School of Electronic Engineering and Intelligent Manufacturing, Anqing Normal University, Anqing 246133, China
2. College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310058, China
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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.
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    
Abstract:

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.
Key words: beamforming design    covert communication    dual-function radar and communication (DFRC)    reconfigurable intelligence surface (RIS)    generalized fully connected RIS
收稿日期: 2023-03-13 出版日期: 2023-12-27
CLC:  TN 929.5  
基金资助: 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)
通讯作者: 黄崇文     E-mail: 122634998@qq.com;chongwenhuang@zju.edu.cn
作者简介: 胡浪涛（1982—），男，副教授，博士，从事隐蔽通信研究. orcid.org/0000-0003-1704-2736. E-mail： 122634998@qq.com
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引用本文:

胡浪涛,杨瑞,黄崇文,刘全金,吴磊,谭镇坤. RIS辅助双功能雷达与隐蔽通信系统性能优化[J]. 浙江大学学报(工学版), 2023, 57(12): 2533-2543.

Lang-tao HU,Rui YANG,Chong-wen HUANG,Quan-jin LIU,Lei WU,Zhen-kun TAN. Performance optimization of RIS assisted dual-function radar and covert communication system. Journal of ZheJiang University (Engineering Science), 2023, 57(12): 2533-2543.

链接本文:

https://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2023.12.020    或    https://www.zjujournals.com/eng/CN/Y2023/V57/I12/2533

图 1  RIS辅助的DFRC隐蔽通信系统模型
参数 数值
BS位置/m (0, 0)
RIS位置/m (200 , 0 )
Bob位置/m 在以(200 , 30)为中心，半径<10
Willie位置/m (180 , 40 )
目标方向 从BS发射沿 ${0^\circ }$方向
BS天线数M 16
RIS反射元件数N 20
系统发射功率P/dBm 20
噪声功率 $ \sigma _{\rm{b}}^2 、 \sigma _{\rm{w}}^2 $/dBm 0
间接路径损失/dB $35.6+22.0\lg d{\text{ }}$
直接路径损失/dB $32.6+36.7\lg d{\text{ }}$
隐蔽性阈值 0.005
CSI误差 ${v_{\rm{w}}} $ 0.005
表 1  RIS辅助DFRC隐蔽通信系统仿真参数设置
图 2  多策略交替优化算法的收敛性
图 3  2种Willie场景下的波束方向图比较
图 4  2种Willie场景下目标处的探测功率与Bob隐蔽通信速率的折中
图 5  RIS反射元件数量对波束方向图的影响
图 6  RIS水平部署位置对波束方向图的影响
图 7  隐蔽性阈值与Bob隐蔽通信速率的关系
图 8  隐蔽性阈值与检测错误概率的关系
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