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.
Degrees of freedom in 3D linear large-scale antenna array communications—a spatial bandwidth approach,
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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.