Testing gNodeBs in ideal lab conditions is a key step in product development to ensure they meet 3GPP standards. But it's just as important to test in real-world scenarios to make sure they perform well when deployed. For Multi-User MIMO (MU-MIMO), inter-beam interference can seriously impact performance if the O-DU (Open Distributed Unit) miscalculates beamforming weights.
This paper looks at how digital spatial models can simulate inter-beam interference, helping engineers fine-tune O-RU (Open Radio Unit) antenna geometry, beamforming weights, and angles of arrival for better real-world performance.