This paper characterizes the fundamental limits of integrated sensing and communication (ISAC) when the transmitter is subject to a representation-constrained encoder modeled via a mutual information (MI) bottleneck and the receiver employs a fluid antenna system (FAS). Specifically, the message is first encoded into an ideal Gaussian waveform and then mapped by a stochastic encoder into a finite capacity representation that serves as the channel input in the adopted analytical abstraction, while the FAS receiver selects the port with the most favorable channel conditions. From an information-theoretic perspective, we show that the representation bottleneck is equivalent to an additive representation noise, which reduces both the communication and sensing signal-to-noise ratios (SNRs) at the selected port. We then derive the resulting ISAC capacity-distortion region and establish tight converse and achievability bounds under general fading models, including Jakes correlated channels. Leveraging the spatial degrees of freedom (DoF) characterization of the Jakes' model, we prove that the port selection gain is fundamentally constrained by the physical length of the FAS region: the effective diversity order equals the numerical rank of the Jakes' correlation matrix and increases only with the FAS length. Consequently, enlarging the FAS length allows the selected communication SNR to approach the representation-limited ceiling, driving the achievable rate toward its fundamental bound. The sensing mean square error (MSE) similarly approaches its bound when the selected sensing gain also increases with the FAS aperture. Numerical results corroborate the analysis and scaling laws.
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）
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）
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）
Xinjiang University（新疆大学）；Dongguan University of Technology（东莞理工学院）；Chongqing University of Posts and Telecommunications（重庆邮电大学）；Tsinghua University（清华大学）；University of Science and Technology Beijing（北京科技大学）
Pinching-Antenna-Enabled ISAC: A Unified Architecture for Flexible Communication and Sensing
Chongqing University of Posts and Telecommunications（重庆邮电大学）；Queen Mary University of London（伦敦玛丽女王大学）；Zhengzhou University of Aeronautics（郑州航空工业管理学院）；Imperial College London（帝国理工学院）
Weighted Sum Rate Optimization for Movable Antenna Enabled Near-Field ISAC
Institute of Communications Engineering, National Sun Yat-sen University（国立中山大学通信工程研究所）；School of Electrical and Electronic Engineering, University College Dublin（都柏林大学电气与电子工程学院）
Antenna Orientation Optimization for Rotatable Antenna-Enabled ISAC Systems
School of Microelectronics, South China University of Technology（华南理工大学微电子学院）；School of Information Engineering, Guangdong University of Technology（广东工业大学信息工程学院）
Ray Antenna Array Enhanced Low-Altitude ISAC: Performance Analysis and Beamforming Design
The Sixty-third Research Institute, National University of Defense Technology（国防科技大学第六十三研究所）；National Mobile Communications Research Laboratory, Southeast University（东南大学移动通信国家重点实验室）；Purple Mountain Laboratories（紫金山实验室）
Physics-Informed Implicit Neural Representation for Wireless Imaging in RIS-Aided ISAC System
School of Information Science and Engineering, Southeast University（东南大学信息科学与工程学院）；Institute of Communications Engineering, National Sun Yat-sen University（国立中山大学通信工程研究所）
Joint Antenna Geometry and Transmit Covariance Design for Near-Field Multicast ISAC with Pinching Antenna Arrays
Hunan Institute of Science and Technology（湖南理工学院）；Hunan Institute of Engineering（湖南工程学院）；Donghua University（东华大学）；Laval University（拉瓦尔大学）；University of Saskatchewan（萨斯喀彻温大学）；Henan Polytechnic University（河南理工大学）
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。
Movable Subarray-Aided ISAC in Hybrid Near-Far Field Channels
Wireless and Computing Research Institute, ZTE Corporation（中兴通讯无线与计算研究院）；State Key Laboratory of Environment Characteristics and Effects for Near-space, Beijing Institute of Technology（北京近空环境特性及效应全国重点实验室）；Department of Electronic Engineering, Shanghai Jiao Tong University（上海交通大学电子工程系）
National Mobile Communications Research Laboratory, Frontiers Science Center for Mobile Information Communication and Security, Southeast University（东南大学移动通信国家重点实验室、移动信息与安全前沿科学中心）；Purple Mountain Laboratories（紫金山实验室）；Key Laboratory of Intelligent Support Technology for Complex Environments, Ministry of Education, Nanjing University of Information Science and Technology（南京信息工程大学教育部复杂环境智能支持技术重点实验室）；School of Cyber Science and Engineering, Southeast University（东南大学网络空间安全学院）
Uplink Signal Detection For Large-Scale MIMO-ISAC Systems
School of Information Science and Engineering, Southeast University（东南大学信息科学与工程学院）；School of Electrical and Electronics Engineering, Nanyang Technological University（南洋理工大学电气与电子工程学院）
