Beamforming Design for Terrestrial-Satellite Spectrum Sharing in Upper Mid-Band Based on Angular Radiated Power Constraint

This paper investigates the beamforming design for an upper mid-band multi-user multiple-input single-output (MUMISO) system, aiming to mitigate interference from terrestrial base stations to satellites. The upper mid-band (7-24 GHz) is already utilized by several satellite services, necessitating the coexistence of emerging cellular systems with these existing satellite systems. As such, we propose a beamforming design with an angular radiated power constraint directed towards the sky angle region, effectively mitigating interference without requiring prior information about the satellites. Numerical results validate the efficacy of the proposed method in reducing interference. Moreover, we demonstrate that the proposed method can achieve sum spectral efficiency performance comparable to sum rate maximization approaches without such constraints.