Integrated sensing and communication (ISAC) has been receiving a notable interest as an energy- and spectrum-efficient enabler for simultaneous communication and sensing. Notably, reconfigurable intelligent surfaces (RIS) is among the key technologies enabling robust communication and sensing, particularly in environments without a line-of-sight (LoS). Recently, a new type of RIS, called beyond-diagonal RIS (BD-RIS), has drawn attention, offering additional degrees of freedom in controlling the propagation medium. In this paper, a novel secure BD-RIS-aided ISAC scheme is proposed and evaluated. The scheme is applicable to a multi-user multi-target ISAC network, where a dual-functional radar-communication (DFRC) base station (BS) simultaneously serves multiple downlink users and senses various targets that aim to eavesdrop on the legitimate signal transmitted to the users. The presence of a BD-RIS enables circumventing the absence of the LoS link and ensures secure transmission and sensing. To this end, an optimization problem is formulated aiming at maximizing a weighted sum of per-target reflected powers, subject to secrecy and transmit power constraints. Thus, by virtue of an Augmented Lagrangian- and Riemannian conjugate gradient-based approach, in addition to semidefinite programming, an alternating optimization (AO)-based algorithm is developed, which provides a local optimum for the BD-RIS scattering matrix, transmit signal beamforming matrices, and artificial noise covariance matrix. Numerical results highlight (i) the notable sensing gains of the BD-RIS-aided design with respect to its diagonal RIS (D-RIS)-based baseline and (ii) the improved secrecy-sensing trade-off, whereby the BD-RIS can ensure an increasing system secrecy without a significant loss in the per-target reflected power.
Secure Transmission for Fluid Antenna-Aided ISAC Systems
School of Information Science and Engineering, Shandong University（山东大学信息科学与工程学院）；Information Technology Service Center, People’s Court, Beijing（北京市人民法院信息技术服务中心）
Resource Allocation for Secure Dual-UAV-Assisted ISAC System
Chongqing University of Posts and Telecommunications（重庆邮电大学）；King Abdullah University of Science and Technology (KAUST)（阿卜杜拉国王科技大学）；State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University（重庆大学电气工程学院）；Hunan University（湖南大学）；School of Information Engineering, Changsha Medical University（长沙医学院信息工程学院）；Beijing Institute of Technology（北京理工大学）
Sensing-Assisted Secure Communication in MA-Aided ISAC: CRB Analysis and Robust Design
School of Information Engineering, Guangdong University of Technology（广东工业大学信息工程学院）；Department of Electronic Engineering, Shanghai Jiao Tong University（上海交通大学电子工程系）；Department of Electrical and Computer Engineering, National University of Singapore（新加坡国立大学电气与计算机工程系）
本文提出一种基于 MA 有帮助的 ISAC 系统的传感辅助安全通信方案，通过优化 MA 位置以提高传感精度，并利用 CRB 分析和鲁棒设计提升保密率。
Dual Target-Mounted RISs-Assisted ISAC Against Eavesdropping and Malicious Interference
Artificial Intelligence and 6G Laboratory (6GEN. LAB.), Turkcell Iletisim Hizmetleri Inc.（Turkcell通信服务公司人工智能与6G实验室）；Communications and Signal Processing Research (HİSAR) Lab., TÜBİTAK-BİLGEM（TÜBİTAK-BİLGEM通信与信号处理研究实验室）；Department of Electrical and Electronics Engineering, Koc University（罗切斯特大学电气与电子工程系）；Department of Electrical Engineering, Tampere University（坦佩雷大学电气工程系）；Electronics and Communication Department, Istanbul Technical University（伊斯坦布尔理工大学电子与通信系）
RIS-Aided Cooperative ISAC Network for Imaging-Based Low-Altitude Surveillance
Southeast University（东南大学）；National Mobile Communications Research Laboratory, Southeast University（东南大学国家移动通信实验室）；Key Laboratory of Measurement and Control of Complex Systems of Engineering, Ministry of Education, Southeast University（东南大学教育部复杂工程测控重点实验室）；Frontiers Science Center for Mobile Information Communication and Security, Southeast University（东南大学移动信息通信与安全前沿科学中心）
Chongqing University of Posts and Telecommunications（重庆邮电大学）；King Abdullah University of Science and Technology (KAUST)（阿卜杜拉国王科技大学）；Chongqing University（重庆大学）；Hunan University（湖南大学）；Beijing Institute of Technology（北京理工大学）
Joint Precoding and Phase-Shift Optimization for Beyond-Diagonal RIS-Aided ISAC System
School of Information Science and Engineering, Shandong University（山东大学信息科学与工程学院）；National Mobile Communications Research Laboratory, Southeast University（东南大学移动通信国家重点实验室）
Joint Active and Passive Beamforming with Sensing-Assisted Discrete Phase Shifts for Dual-RIS ISAC Systems
Chongqing University of Posts and Telecommunications（重庆邮电大学）；National Mobile Communications Research Laboratory, Southeast University（东南大学移动通信国家重点实验室）；University of Macau（澳门大学）
