Evaluation of multi‐user multiple‐input multiple‐output digital beamforming algorithms in B5G/6G low Earth orbit satellite systems

Summary Satellite communication systems will be a key component of 5G and 6G networks to achieve the goal providing unlimited ubiquitous communications deploying smart sustainable networks. To meet ever‐increasing demand for higher throughput in beyond, aggressive frequency reuse schemes (i.e., full reuse), combined with digital beamforming techniques cope massive co‐channel interference, are recognized as solution. Aimed at (i) eliminating joint optimization problem among vectors all users, (ii) splitting it into distinct ones, (iii) finding closed‐form solution, we propose algorithm based on maximizing users' signal‐to‐leakage‐and‐noise ratio served by low Earth orbit satellite. We investigate assess performance several algorithms, including both those channel state information transmitter, that is, minimum mean square error zero forcing, only requiring locations, switchable multi‐beam. Through detailed numerical analysis, provide thorough comparison terms per‐user achievable spectral efficiency aforementioned schemes, show proposed signal to‐leakage‐plus‐noise technique is able outperform multi‐beam presented satellite scenario.