Under the Clarke model, fluid antenna channel recovery becomes feasible when the number of observed ports reaches the modal dimension r approximately 2W+1, which is set by aperture, not port count.
On fundamental limits of slow-fluid antenna multiple access for unsourced random access,
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CSI Reconstruction in Fluid Antenna Systems Without Spatial Covariance Priors
Under the Clarke model, fluid antenna channel recovery becomes feasible when the number of observed ports reaches the modal dimension r approximately 2W+1, which is set by aperture, not port count.