Derives wideband compressed-domain CRB for near-field XL-MIMO, decomposing Fisher information into dominant data-diversity gain scaling as 10 log10(Ks) dB and secondary geometric-diversity from frequency-dependent Fresnel curvature, with +27.8 dB total improvement at 28 GHz and 400 MHz bandwidth.
Covariance-domain near-field channel estimation under hybrid compression: USW/Fresnel model, curvature learning, and KL covariance fitting
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Wideband Compressed-Domain Cramer-Rao Bounds for Near-Field XL-MIMO: Data and Geometric Diversity Decomposition
Derives wideband compressed-domain CRB for near-field XL-MIMO, decomposing Fisher information into dominant data-diversity gain scaling as 10 log10(Ks) dB and secondary geometric-diversity from frequency-dependent Fresnel curvature, with +27.8 dB total improvement at 28 GHz and 400 MHz bandwidth.