When making use of a MU-MIMO mode on the downlink (3D model), I can see that the SINR levels and the throughput go up as the configurations go up (from 2×2 to 4×2, and to 4×4) even though just 2 users can access the same time-frequency resource. I don’t fully understand why this happens. Could you please explain to me, or refer me to some documentation that addresses this matter?
Also, I’ve read that MU-MIMO is not widely recommended on downlink level. Why is this?
Thank you for your attention.
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