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Fluid antenna systems (FAS) have recently emerged as a promising paradigm for achieving spatially reconfigurable, compact, and energy-efficient wireless communications in beyond fifth-generation (B5G) and sixth-generation (6G) networks. By…

Signal Processing · Electrical Eng. & Systems 2026-02-02 Saeid Pakravan , Mohsen Ahmadzadeh , Ming Zeng , Wessam Ajib , Ji Wang , Xingwang Li

Multiple-input multiple-output (MIMO) technology has significantly impacted wireless communication, by providing extraordinary performance gains. However, a minimum inter-antenna space constraint in MIMO systems does not allow its…

Information Theory · Computer Science 2022-05-05 Priyadarshi Mukherjee , Constantinos Psomas , Ioannis Krikidis

In this paper, we analyze the role of fluid antenna systems (FAS) in multi-user systems with hardware impairments (HIs). Specifically, we investigate a scenario where a base station (BS) equipped with multiple fluid antennas communicates…

Signal Processing · Electrical Eng. & Systems 2024-12-23 Junteng Yao , Tuo Wu , Liaoshi Zhou , Ming Jin , Cunhua Pan , Maged Elkashlan , Fumiyuki Adachi , George K. Karagiannidis , Naofal Al-Dhahir , Chau Yuen

Over the past decades, multiple antenna technologies have appeared in many different forms, most notably as multiple-input multiple-output (MIMO), to transform wireless communications for extraordinary diversity and multiplexing gains. The…

Information Theory · Computer Science 2020-05-26 Kai-Kit Wong , Arman Shojaeifard , Kin-Fai Tong , Yangyang Zhang

Physical-layer security (PLS) is a promising technique to complement more traditional means of communication security in beyond-5G wireless networks. However, studies of PLS are often based on ideal assumptions such as infinite coding…

Information Theory · Computer Science 2024-05-14 Milad Tatar Mamaghani , Xiangyun Zhou , Nan Yang , A. Lee Swindlehurst , H. Vincent Poor

The fluid antenna system (FAS) has emerged as a disruptive technology, offering unprecedented degrees of freedom (DoF) for wireless communication systems. However, optimizing fluid antenna (FA) positions entails significant computational…

Information Theory · Computer Science 2025-05-13 Tianyi Liao , Wei Guo , Hengtao He , Shenghui Song , Jun Zhang , Khaled B. Letaief

Fluid antenna systems (FAS) are emerging as a transformative enabler for sixth-generation (6G) wireless communications, providing unprecedented spatial diversity through dynamic reconfiguration of antenna ports. However, the inherent…

In this letter, we investigate the security of fluid antenna system (FAS)-reconfigurable intelligent surfaces (RIS) communication systems. The base station (BS) employs a single fixed-position antenna, while both the legitimate receiver and…

Signal Processing · Electrical Eng. & Systems 2024-11-05 Jianchao Zheng , Xiazhi Lai , Tuo Wu , Maged Elkashlan , Daniel Benevides da Costa , Chau Yuen , Fumiyuki Adachi

In this correspondence, we analyze the performance of a reconfigurable intelligent surface (RIS)-aided communication system that involves a fluid antenna system (FAS)-enabled receiver. By applying the central limit theorem (CLT), we derive…

Signal Processing · Electrical Eng. & Systems 2024-08-27 Xiazhi Lai , Junteng Yao , Kangda Zhi , Tuo Wu , David Morales-Jimenez , Kai-Kit Wong

The Fluid Antenna System (FAS) overcomes the spatial degree-of-freedom limitations of conventional static antenna arrays in wireless communications.This capability critically depends on acquiring full Channel State Information across all…

Signal Processing · Electrical Eng. & Systems 2025-08-05 Xuehui Dong , Kai Wan , Shuangyang Li , Robert Caiming Qiu , Giuseppe Caire

In this paper, we investigate a fluid antenna system (FAS)-assisted downlink non-orthogonal multiple access (NOMA) for short-packet communications. The base station (BS) adopts a single fixed antenna, while both the central user (CU) and…

Information Theory · Computer Science 2023-10-24 Jianchao Zheng , Tuo Wu , Xiazhi Lai , Cunhua Pan , Maged Elkashlan , Kai-Kit Wong

This paper proposes a novel fluid antenna system (FAS)-enabled architecture to improve energy efficiency (EE) without sacrificing capacity. Specifically, we integrate FAS into cell-free massive MIMO systems to counteract low-resolution…

Information Theory · Computer Science 2026-05-28 Jun Qian , Ross Murch , Khaled B. Letaief

The Fluid Antenna System (FAS), which enables flexible Multiple-Input Multiple-Output (MIMO) communications, introduces new spatial degrees of freedom for next-generation wireless networks. Unlike traditional MIMO, FAS involves joint port…

Information Theory · Computer Science 2025-06-18 Chao Wang , Kai-Kit Wong , Zan Li , Liang Jin , Chan-Byoung Chae

This paper investigates two distinct types of block errors - undetected errors (confusions) and erasures - in additive white Gaussian noise (AWGN) channels with error-bounded block decoders operating in the finite blocklength (FBL) regime.…

Information Theory · Computer Science 2026-01-07 Bin Han , Yao Zhu , Rafael F. Schaefer , Giuseppe Caire , Anke Schmeink , H. Vincent Poor , Hans D. Schotten

In this paper, we propose an energy efficient wireless communication system based on fluid antenna relay (FAR) to solve the problem of non-line-of-sight (NLoS) links caused by blockages with considering the physical properties. Driven by…

Signal Processing · Electrical Eng. & Systems 2025-08-07 Ruopeng Xu , Zhaohui Yang , Zhaoyang Zhang , Mohammad Shikh-Bahaei , Kaibin Huang , Dusit Niyato

Fluid antenna systems (FAS) have emerged as a revolutionary technology offering enhanced spatial diversity within a compact form factor. Concurrently, unmanned aerial vehicles (UAVs) are integral to future networks, necessitating channel…

Information Theory · Computer Science 2025-11-24 Xusheng Zhu , Kai-Kit Wong , Qingqing Wu , Hyundong Shin , Yangyang Zhang

Reconfigurability is a desired characteristic of future communication networks. From a transceiver's standpoint, this can be materialized through the implementation of fluid antennas (FAs). An FA consists of a dielectric holder, in which a…

Signal Processing · Electrical Eng. & Systems 2023-07-26 Constantinos Psomas , Ghassan M. Kraidy , Kai-Kit Wong , Ioannis Krikidis

Fluid antenna enables position reconfigurability that gives transceiver access to a high-resolution spatial signal and the ability to avoid interference through the ups and downs of fading channels. Previous studies investigated this fluid…

Signal Processing · Electrical Eng. & Systems 2025-04-30 Tianyu Han , Yongxu Zhu , Kai-Kit Wong , Gan Zheng , Hyundong Shin

In this work, a novel design of electromagnetically reconfigurable antennas (ERAs) based on a fluid antenna system (FAS) is proposed, and the corresponding wireless channel model is established. Different from conventional antenna arrays…

Systems and Control · Electrical Eng. & Systems 2025-05-06 Ruiqi Wang , Pinjun Zheng , Tareq Y. Al-Naffouri , Atif Shamim

Fluid antenna system (FAS) has recently surfaced as a promising technology for the upcoming sixth generation (6G) wireless networks. Unlike traditional antenna system (TAS) with fixed antenna location, FAS introduces a flexible component in…

Signal Processing · Electrical Eng. & Systems 2024-11-04 Wee Kiat New , Kai-Kit Wong , Hao Xu , Farshad Rostami Ghadi , Ross Murch , Chan-Byoung Chae