Authors
Aditya Wadaskar and Danijela Cabric
Abstract
The upper-mid band from 7-24 GHz, also called the FR3 band, offers ample opportunities for the expansion of wireless networks owing to abundant spectrum and favorable propagation characteristics. However, terrestrial network deployments in these bands need to co-exist with the incumbent satellite communication. This requires the base station (BS) to employ effective wideband 3D null steering to protect incumbent satellites from interference without compromising the beamforming gain for terrestrial communication. Analog planar antenna arrays, though cost-effective, offer limited degrees of freedom for effective nulling, whereas fully digital arrays are costly. Hybrid arrays offer a reasonable trade-off between additional degrees of freedom and complexity cost. This work proposes the adaptation of analog and hybrid True-Time-Delay (TTD) array precoders at the BS for joint null steering and main-lobe gain maximization to facilitate seamless degradation-free satellite- terrestrial coexistence.