Derives closed-form Rayleigh distribution for minimum inter-port distance in planar fluid antenna arrays (scaling O(M^{-1})) and a 2x2 geometric inertia matrix governing universal CRB for joint elevation-azimuth estimation, with invariance to azimuth and a precision-ambiguity trade-off.
Cram´ er– Rao bounds for activity detection in conventional and fluid a ntenna sys- tems,
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Finite-Aperture Planar Fluid Antenna Array
Derives closed-form Rayleigh distribution for minimum inter-port distance in planar fluid antenna arrays (scaling O(M^{-1})) and a 2x2 geometric inertia matrix governing universal CRB for joint elevation-azimuth estimation, with invariance to azimuth and a precision-ambiguity trade-off.