A closed-form local spatial bandwidth expression for 3D line-of-sight linear-array channels is derived, and it shows the effective degrees of freedom are approximately maximized when the receive array is coplanar and perpendicular to the centroid axis.
Spatial bandwidth asymptotic analysis for 3D large-scale antenna array communications,
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Spatial Bandwidth of Bilateral Near-Field Channels for Linear Large-Scale Antenna Array System
A closed-form local spatial bandwidth expression for 3D line-of-sight linear-array channels is derived, and it shows the effective degrees of freedom are approximately maximized when the receive array is coplanar and perpendicular to the centroid axis.