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.
Line-of-sight extra-large MIMO systems with angular- domain processing: Channel representation and transceiver architecture,
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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.