New constructive derivation of the misspecified Cramér-Rao bound via maximization of a naive bound over pointwise equivalent models, with explicit estimator-class characterization and proof that the misspecified ML estimator is efficient if it exists.
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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.
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Revisiting the Misspecified Cram\'er-Rao Bound
New constructive derivation of the misspecified Cramér-Rao bound via maximization of a naive bound over pointwise equivalent models, with explicit estimator-class characterization and proof that the misspecified ML estimator is efficient if it exists.
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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.