33 papers
Mutual-Coupling-Aware Electromagnetic and Signal Processing Co-Design for Pixel Antenna Arrays
Ping Ma, Mengzhen Liu, Rang Liu +2
Reconfigurable pixel antenna arrays provide additional electromagnetic (EM) degrees of freedom for wireless transmission by enabling hardware-level adaptation of radiation response…
PARAFAC-Based Low-Latency Angular Tracking for RIS-Assisted Sensing
Kenneth Benício, André L. F. de Almeida, Bruno Sokal +3
This paper proposes adaptive tensor tracking for angular trajectories (ATTRACT), a structure-aware alternating least squares algorithm for low-latency target tracking in reconfigur…
TiamiTwin: A Digital Twin for Bistatic ISAC Drone Sensing, Validated Against Measurements
Mehdi Zafari, Saeede Enayati, A. Lee Swindlehurst +1
Monitoring lower airspace over critical infrastructure using cellular signals of opportunity is highly practical because transmitters are pre-deployed, licensed, and continuously a…
CORDIS: A Scalable Coordinated Resource Allocation Framework for Distributed Cell-Free ISAC
Mehdi Zafari, Björn Ottersten, A. Lee Swindlehurst
Integrated Sensing and Communication (ISAC) is envisioned as a key technology for 6G wireless networks, enabling the joint use of spectrum and hardware for sensing and communicatio…
Feasible but Not Safe: Constraint Violations and Report-Channel Attacks in Learned Cell-Free ISAC Association
Mehdi Zafari, Iman Mohammadi, A. Lee Swindlehurst
Learning-based schedulers have been proposed to provide real-time user, target, and access point (AP) association in distributed cell-free integrated sensing and communication syst…
Parametric Diffraction-Based Object Sensing: Modeling, Estimation, and Fundamental Limits
Jiaqi Xu, Bjorn Ottersten, A. Lee Swindlehurst
This paper proposes a rigorous framework for sensing of environmental objects using diffraction mechanisms prevalent at wireless communication frequencies. Specifically, we develop…
Multiuser MIMO-AFDM Beamforming for ISAC in Doubly Dispersive Channels
Rang Liu, Ming Li, A. Lee Swindlehurst +2
Integrated sensing and communication (ISAC) in high-mobility channels requires waveform and beamforming designs that are robust to delay-Doppler dispersion. With this in mind, in t…
Lightweight Vision-Aided Beam Tracking for Cross-Environment mmWave Communications
Mengyuan Ma, Ahmed Alkhateeb, Nhan Thanh Nguyen +2
Sensing-aided beam tracking is a promising approach to reduce the overhead for millimeter-wave beam management. However, real-world application remains challenging due to rapid cha…
Decoupled Delay-Doppler and Angle Estimation in BD-RIS Sensing via Nested Tucker Decomposition
Kenneth Benício, André L. F. de Almeida, Fazal-E-Asim +4
We study single-target localization in a group-connected beyond-diagonal reconfigurable intelligent surface (BD-RIS)-assisted monostatic network with K element groups. We propose a…
Multi-Target Estimation via Tensor Decomposition for Beyond Diagonal RIS-Aided Bistatic Sensing
Kenneth Benício, André L. F. de Almeida, Fazal-E Asim +4
We investigate the performance of beyond-diagonal reconfigurable intelligent surfaces (BD-RIS) for bistatic MIMO multi-target sensing using a two-stage tensor Doppler-delay-angle e…
Knowledge Distillation for Lightweight Multimodal Sensing-Aided mmWave Beam Tracking
Mengyuan Ma, Isuri Welgamage, Ahmed Alkhateeb +3
Beam training and prediction in real-world millimeter-wave (mmWave) communications systems are challenging due to rapidly time-varying channels and strong interference from surroun…
Knowledge Distillation for Collaborative Learning in Distributed Communications and Sensing
Nhan Thanh Nguyen, Mengyuan Ma, Nir Shlezinger +4
The rise of sixth generation (6G) wireless networks promises to deliver ultra-reliable, low-latency, and energy-efficient communications, sensing, and computing. However, tradition…
Extended Target Sensing in MIMO-OFDM ISAC Systems: Modeling, Optimization and Estimation
Rang Liu, Ming Li, A. Lee Swindlehurst
This paper develops a comprehensive target modeling, beamforming optimization, and parameter estimation framework for extended-target sensing in wideband MIMO-OFDM integrated sensi…
Robust Wildfire Forecasting under Partial Observability: From Reconstruction to Prediction
Chen Yang, Mehdi Zafari, Ziheng Duan +1
Satellite-derived fire observations are the primary input for learning-based wildfire spread prediction, yet they are inherently incomplete due to cloud cover, smoke obscuration, a…
OFDM-ISAC Beyond CP Limit: Performance Analysis and Mitigation Algorithms
Peishi Li, Ming Li, Rang Liu +2
Orthogonal frequency division multiplexing (OFDM) is well-suited for integrated sensing and communications (ISAC), yet its cyclic prefix (CP) is dimensioned for communications-grad…
ASSENT: Learning-Based Association Optimization for Distributed Cell-Free ISAC
Mehdi Zafari, A. Lee Swindlehurst
Integrated Sensing and Communication (ISAC) is a key emerging 6G technology. Despite progress, ISAC still lacks scalable methods for joint AP clustering and user/target scheduling…
Reconfigurable Antenna Arrays: Bridging Electromagnetics and Signal Processing
Mengzhen Liu, Ming Li, Rang Liu +2
Reconfigurable antennas (RAs), capable of dynamically adapting their radiation patterns, polarization states, and operating frequencies, have emerged as a promising technology to m…
Clutter Suppression in ISAC Systems with Compound Reconfigurable Antenna Arrays
Mengzhen Liu, Ming Li, Rang Liu +2
Integrated sensing and communication (ISAC) systems often suffer severe performance degradation due to strong clutter echoes, and spatial-only beamforming is often inadequate for r…
Coordinated Decentralized Resource Optimization for Cell-Free ISAC Systems
Mehdi Zafari, Rang Liu, A. Lee Swindlehurst
Integrated Sensing and Communication (ISAC) is emerging as a key enabler for 6G wireless networks, allowing the joint use of spectrum and infrastructure for both communication and…
Multi-Domain Optimization Framework for ISAC: From Electromagnetic Shaping to Network Cooperation
Rang Liu, Ming Li, Mehdi Zafari +2
Integrated sensing and communication (ISAC) has emerged as a key feature for sixth-generation (6G) networks, providing an opportunity to meet the dual demands of communication and…
Channel Estimation for Downlink Communications Based on Dynamic Metasurface Antennas
Amarilton L. Magalhães, Fazal E-Asim, André L. F. de Almeida +1
Dynamic metasurface antennas (DMAs) are emerging as a promising technology to enable energy-efficient, large array-based multi-antenna systems. This paper presents a simple channel…
Sensing-Oriented Adaptive Resource Allocation Designs for OFDM-ISAC Systems
Peishi Li, Ming Li, Rang Liu +2
Orthogonal frequency division multiplexing - integrated sensing and communication (OFDM-ISAC) has emerged as a key enabler for future wireless networks, leveraging the widely adopt…
Byzantine-Resilient Over-the-Air Federated Learning under Zero-Trust Architecture
Jiacheng Yao, Wei Shi, Wei Xu +3
Over-the-air computation (AirComp) has emerged as an essential approach for enabling communication-efficient federated learning (FL) over wireless networks. Nonetheless, the inhere…
Low Range-Doppler Sidelobe ISAC Waveform Design: A Low-Complexity Approach
Peishi Li, Ming Li, Rang Liu +2
Integrated sensing and communication (ISAC) is a pivotal enabler for next-generation wireless networks. A key challenge in ISAC systems lies in designing dual-functional waveforms…