Enormous Fluid Antenna Systems (E-FAS): Channel Estimation
University College London（伦敦大学学院）；Yonsei University（延世大学）；Aalto University（阿尔托大学）；National Mobile Communications Research Laboratory, Southeast University（东南大学国家移动通信重点实验室）；Hong Kong Metropolitan University（香港都会大学）；Shenzhen Technology University（深圳职业技术大学）
Enormous fluid antenna systems (E-FAS) have recently emerged as a new wireless architecture in which intelligent metasurfaces act as guided electromagnetic interfaces, enabling surface-wave (SW) propagation with much lower attenuation and more control than conventional space-wave transmission. While prior work has reported substantial power gains under perfect channel state information (CSI), the impact of practical channel acquisition on E-FAS performance remains largely unexplored. This paper presents the first comprehensive analysis of E-FAS-assisted downlink transmission under pilot-based channel estimation. We develop an estimation framework for the equivalent end-to-end channel and derive closed-form expressions for the statistics of the minimum mean-square-error (MMSE) channel estimate and its estimation error. Building on these results, we analyze both single-user and multiuser operation while explicitly accounting for the training overhead. For the single-user case, we characterize the outage probability and achievable rate with imperfect CSI, and reveal an inherent signal-to-noise ratio (SNR) saturation phenomenon caused by residual self-interference. For the multiuser case, we study zero-forcing (ZF) precoding based on imperfect channel estimates and show that the system becomes interference-limited in the high SNR regime because of residual inter-user interference. Furthermore, we quantify the trade-off between spatial multiplexing gains and pilot overhead when the number of users increases. Analytical findings are validated via Monte Carlo simulations and benchmarked against least-squares (LS) estimation and conventional non-E-FAS transmission. The results reveal that despite CSI imperfections and training costs, E-FAS retains substantial performance advantages and provides robustness enabled by its amplified large-scale channel gain.
On the Performance of Single/Dual Fluid Antenna Systems
Beijing Jiaotong University（北京交通大学）；Lancaster University（兰卡斯特大学）；The University of Hong Kong（香港大学）；Queen Mary University of London（伦敦大学玛丽女王学院）；Kyung Hee University（庆熙大学）
Fluid Antennas Assisted RIS-NOMA Communication Networks
Beihang University（北京航空航天大学）；North China University of Water Resources and Electric Power（华北水利水电大学）；Manchester Metropolitan University（曼彻斯特城市大学）；Queen Mary University of London（伦敦玛丽女王大学）
Finite-blocklength Fluid Antenna Systems With Spatial Block-Correlation Channel Model
National Mobile Communications Research Laboratory, Southeast University（东南大学国家移动通信重点实验室）；School of Artificial Intelligence, Nanjing University of Information Science and Technology（南京信息工程大学人工智能学院）；Department of Electronic and Electrical Engineering, University College London（伦敦大学学院电子电气工程系）；Yonsei Frontier Lab., Yonsei University（延世大学延世前沿实验室）；Department of Signal Theory, Networking and Communications, University of Granada（格拉纳达大学信号理论与网络通信系）；Telecommunications Research Institute (TELMA), University of Malaga（马拉加大学电信研究所（TELMA））；School of Integrated Technology, Yonsei University（延世大学综合技术学院）
OFDM Enabled Over-the-Air Computation Systems with Two-Dimensional Fluid Antennas
School of Electronics and Information Technology, Sun Yat-sen University（中山大学电子与信息工程学院）；School of Computer Science and Engineering, Sun Yat-sen University（中山大学计算机科学与工程学院）
National Mobile Communications Research Laboratory, Southeast University（东南大学国家移动通信实验室）；School of Artificial Intelligence, Nanjing University of Information Science and Technology（南京信息工程大学人工智能学院）；Department of Electronic and Electrical Engineering, University College London（伦敦大学学院电子电气工程系）；Department of Electronic Engineering, Kyung Hee University（庆熙大学电子工程系）；College of Artificial Intelligence, Nanjing University of Information Science and Technology（南京信息工程大学人工智能学院）；School of Information Engineering, Nanchang University（南昌大学信息工程学院）
National Mobile Communications Research Laboratory, Southeast University（国家移动通信重点实验室，东南大学）；Hong Kong Polytechnic University（香港理工大学）；Frontiers Science Center for Mobile Information Communication and Security, Southeast University（移动信息通信与安全前沿科学中心，东南大学）；Purple Mountain Laboratories（紫金山实验室）；University of Granada（格拉纳达大学）
Cramer-Rao Bounds for Activity Detection in Conventional and Fluid Antenna Systems
National Mobile Communications Research Laboratory, Southeast University（东南大学国家移动通信重点实验室）；School of Artificial Intelligence, Nanjing University of Information Science and Technology（南京信息工程大学人工智能学院）；Department of Electronic and Electrical Engineering, University College London（伦敦大学学院电子电气工程系）；Yonsei Frontier Lab., Yonsei University（延世大学延世前沿实验室）；School of Integrated Technology, Yonsei University（延世大学综合技术学院）
UAV-Enabled Short-Packet Communication via Fluid Antenna Systems
University College London（伦敦大学学院）；Yonsei University（延世大学）；Xi’an Jiaotong University（西安交通大学）；Southeast University（东南大学）；City University of Hong Kong（香港城市大学）
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）
Modeling and Performance Analysis for Fluid Antenna System Enabled UAV Near-Field Communications
Southeast University（东南大学）；National Mobile Communications Research Laboratory, Southeast University（东南大学移动通信国家重点实验室）；Hong Kong Polytechnic University（香港理工大学）；University College London（伦敦大学学院）；Kyung Hee University（庆熙大学）
UAV-Enabled Fluid Antenna Systems for Multi-Target Wireless Sensing over LAWCNs
Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences（中国科学院深圳先进技术研究院）；Shenzhen Future Network of Intelligence Institute（深圳未来网络智能研究所）；University of Chinese Academy of Sciences（中国科学院大学）；School of Automation and Intelligent Manufacturing, Southern University of Science and Technology（南方科技大学自动化与智能制造学院）；Department of Electrical and Electronic Engineering, Imperial College London（帝国理工学院电气电子工程系）
On the Performance of Fluid Antenna Systems under Block-Diagonal Correlation Model
Beijing Jiaotong University（北京交通大学）；Beijing University of Posts and Telecommunications（北京邮电大学）；Lancaster University（兰卡斯特大学）；University College London（伦敦大学学院）；Kyung Hee University（庆熙大学）
Artificial-Noise-Aided Secure Near-Field MIMO With Fluid Antenna Systems
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）；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）；Purple Mountain Laboratories（紫金山实验室）；School of Electronic and Information Engineering, South China University of Technology（华南理工大学电子与信息工程学院）；School of Communication Engineering, Hangzhou Dianzi University（杭州电子科技大学通信工程学院）；School of Electronics and Information Engineering, Nanjing University of Information Science and Technology（南京信息工程大学电子与信息工程学院）；School of Communication and Information Engineering, Nanjing University of Posts and Telecommunications（南京邮电大学通信与工程学院）
