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arXiv · 2608.13249

Impedance-Aware Zonal Port Activation for Fluid Antenna Arrays

Yuanhui Wu·Hao Jiang·Zaichen Zhang
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Abstract

Fluid antenna array (FAA) activation jointly determines the effective multi-user channel for precoding and the sparse physical aperture. Channel-oriented selection can concentrate high-gain ports and erode aperture quality, whereas geometry-oriented selection does not adapt to instantaneous channel state information (CSI). This paper formulates finite-port FAA activation as a rate--aperture--feasibility problem under an exact RF-chain budget. We propose impedance-aware zonal port activation (IA-ZPA), which couples compact CSI-conditioned port scoring with a checkerboard feasibility projection and inference-time mutual-impedance-aware selection. The learned scorer ranks ports, while the deterministic rule fixes the active aperture; a separate current-domain RZF backend then evaluates source-drive feasibility. Under a common induced-EMF protocol, IA-ZPA attains the largest constrained rate among the methods satisfying the prescribed mean-PSLL target with a substantially lower decision time than greedy selection.

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Yuanhui Wu, Hao Jiang, Zaichen Zhang. 2026-08-13. Impedance-Aware Zonal Port Activation for Fluid Antenna Arrays. https://arxiv.org/abs/2608.13249

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