5 papers
Effective DoF Collapse in Sparse Near-Field Beamforming: A Block-Rank-1 Mechanism
Changhao He, Xiaojuan Zhang, Francois Chin Po Shin
Sparse near-field arrays phase-cohere widely separated sub-arrays of elements and underpin distributed MIMO, satellite formations, and integrated sensing and communication.…
Cramér-Rao Bound Analysis for Cell-Free ISAC Systems with Fluid Intelligent Metasurfaces
Changhao He, Jiguang He, Asmaa Abdallah +1
Fluid intelligent metasurfaces (FIMs) reshape antenna geometry to improve angular sensitivity. This paper studies their role in cell-free integrated sensing and communication, wher…
Visibility-Region Coupling in XL-MIMO AGV Fleets: Triple-Role Modeling and Masked Beamforming
Changhao He, Xiaojuan Zhang
Extremely large-scale multiple-input multiple-output (XL-MIMO) is a promising technology for supporting automated guided vehicle (AGV) fleets in smart port terminals. However, the…
A Unified Dual Framework for Sparse-Array Near-Field Beam Focusing With Spatial Interference Suppression
Changhao He, Xiaojuan Zhang, Francois Chin Po Shin
We study sparse-array near-field beam focusing with spatial interference suppression, a problem arising in coherent satellite formations and other distributed non-terrestrial array…
Twin-in-the-Loop Optimization and Fundamental Limits of Position--Velocity Estimation in Cell-Free ISAC Systems
Changhao He, Xiaojuan Zhang, Geoffrey Ye Li
Digital twin (DT) networks require tight integration with wireless sensing, yet the fundamental limits of such coupling in cell-free integrated sensing and communication (ISAC) sys…