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Particle-based variational inference (VI) minimizes the KL divergence between model samples and the target posterior with gradient flow estimates. With the popularity of Stein variational gradient descent (SVGD), the focus of particle-based…

机器学习 · 统计学 2023-04-19 Hanze Dong , Xi Wang , Yong Lin , Tong Zhang

Fluid antenna system (FAS) as a new version of reconfigurable antenna technologies promoting shape and position flexibility, has emerged as an exciting and possibly transformative technology for wireless communications systems. FAS…

When the concept of fluid antenna system (FAS) is applied to multiple-input multiple-output (MIMO) systems, this gives rise to MIMO-FAS, a.k.a.~fluid MIMO. Under rich scattering, the spatial correlation matrices are governed by the…

信号处理 · 电气工程与系统科学 2026-03-10 Tuo Wu , Kai-Kit Wong , Baiyang Liu , Kin-Fai Tong , Hyundong Shin

In this paper, we propose a new, combined Zero-Forcing Per-Group Precoding (ZF-PGP) method that achieves very high gains in comparison to ZF Precoding techniques, while it simultaneously offers individually separate streams to reach…

信息论 · 计算机科学 2018-10-22 Thomas Ketseoglou , Ender Ayanoglu

Physical layer key generation from the wireless channel is an emerging area of interest to provide confidentiality and authentication. One of the main challenges in this domain is to increase the length of the secret key while maintaining…

信号处理 · 电气工程与系统科学 2021-10-01 Haji M. Furqan , Jehad M. Hamamreh , Huseyin Arslan

By recognizing the tremendous flexibility of the emerging fluid antenna system (FAS), which allows dynamic reconfigurability of the location of the antenna within a given space, this paper investigates the performance of a single-antenna…

In this paper, we investigate the problem of rate maximization in a fluid antenna system (FAS) assisted semantic communication system. In the considered model, a base station (BS) with multiple static antennas employs semantic extraction…

信号处理 · 电气工程与系统科学 2025-07-01 Siyun Liang , Chen Zhu , Zhaohui Yang , Changsheng You , Dusit Niyato , Kai-Kit Wong , Zhaoyang Zhang

This paper investigates a multiple input single output (MISO) downlink communication system in which users are equipped with fluid antennas (FAs). First, we adopt a field-response based channel model to characterize the downlink channel…

信息论 · 计算机科学 2024-01-17 Haoran Qin , Wen Chen , Zhendong Li , Qingqing Wu , Nan Cheng , Fangjiong Chen

High-level robotic manipulation tasks demand flexible 6-DoF grasp estimation to serve as a basic function. Previous approaches either directly generate grasps from point-cloud data, suffering from challenges with small objects and sensor…

机器人学 · 计算机科学 2025-08-01 Bingran Chen , Baorun Li , Jian Yang , Yong Liu , Guangyao Zhai

This paper investigates beamforming-gain maximization for a fluid reconfigurable intelligent surface (FRIS)-assisted downlink system, where each active port applies a finite-resolution unit-modulus phase selected from a discrete codebook.…

信号处理 · 电气工程与系统科学 2026-02-13 Hong-Bae Jeon

Physical Layer Authentication (PLA) exploits the spatial uniqueness of wireless channel characteristics in order to authenticate devices without recourse to higher-layer cryptographic protocols, which remain vulnerable to key compromise.…

信号处理 · 电气工程与系统科学 2026-04-14 Sachinkumar B. Mallikarjun , Marvin Reski , Andreas Weinand , Hans D. Schotten

The rising energy demands of conventional AI systems underscore the need for efficient computing technologies like brain-inspired computing. Physical reservoir computing (PRC), leveraging the nonlinear dynamics of physical systems for…

应用物理 · 物理学 2025-01-07 Daiki Nishioka , Hina Kitano , Wataru Namiki , Kazuya Terabe , Takashi Tsuchiya

Movable antennas (MA) are a novel technology that allows for the flexible adjustment of antenna positions within a specified region, thereby enhancing the performance of wireless communication systems. In this paper, we explore the use of…

信号处理 · 电气工程与系统科学 2025-11-25 Weijie Xiong , Kai Zhong , Zhiling Xiao , Jingran Lin , Qiang Li

Fluid antenna systems (FAS) have recently emerged as a promising solution for sixth-generation (6G) ultra-dense connectivity. These systems utilize dynamic radiating and/or shaping techniques to mitigate interference and improve spectral…

信号处理 · 电气工程与系统科学 2025-09-25 Baiyang Liu , Jiewei Huang , Tuo Wu , Huan Meng , Fengcheng Mei , Lei Ning , Kai-Kit Wong , Hang Wong , Kin-Fai Tong , Kwai-Man Luk

In this paper, we investigate the problem of max-min rate maximization in fluid antenna relay (FAR)-assisted multi-user uplink multiple-input single-output (MISO) wireless systems, where each user is equipped with a single fluid antenna…

信号处理 · 电气工程与系统科学 2025-07-02 Ruopeng Xu , Zhaohui Yang , Ting Zhang , Mingzhe Chen , Chen Zhu , Zhaoyang Zhang

Non-fixed flexible antenna architectures, such as fluid antenna system (FAS), movable antenna (MA), and pinching antenna, have garnered significant interest in recent years. Among them, rotatable antenna (RA) technology has recently drawn…

信号处理 · 电气工程与系统科学 2025-10-06 Yanhua Tan , Beixiong Zheng , Yi Fang , Derrick Wing Kwan Ng , Jie Xu , Rui Zhang

In this paper, we investigate a large intelligent surface-enhanced (LIS-enhanced) system, where a LIS is deployed to assist secure transmission. Our design aims to maximize the achievable secrecy rates in different channel models, i.e.,…

信息论 · 计算机科学 2020-10-28 Biqian Feng , Yongpeng Wu , Mengfan Zheng , Xiang-Gen Xia , Yongjian Wang , Chengshan Xiao

We propose a novel Hybrid Key Growing (HKG) protocol based on quantum principles and a classical physical-layer assumption. We simultaneously exploit the quantum photon-number and photon-time-bin Degrees of Freedom (DoFs), effectively…

量子物理 · 物理学 2025-09-22 Pol Julià Farré , Chris Aaron Schneider , Christian Deppe

Millimeter-wave networks have already been successfully rolled out in many countries and now the research direction heads toward new technologies and standards to enable Tbps rates for future sixth-generation (6G) wireless communication…

Reconfigurable intelligent surface (RIS)-aided wireless communications have drawn significant attention recently. We study the physical layer security of the downlink RIS-aided transmission framework for randomly located users in the…

信息论 · 计算机科学 2021-04-09 Jiayi Zhang , Hongyang Du , Qiang Sun , Bo Ai , Derrick Wing Kwan Ng