What is NOMA in 5G Mobile Communications?

This video explains Non-Orthogonal Multiple Access (NOMA) in 5G mobile communications downlink.
(... and just one thing to note, I must have had a mind-blank when I made the video: In the equations for y_1 and y_2, all the p's should be sqrt(p)'s.)
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Видео What is NOMA in 5G Mobile Communications? канала Iain Explains Signals, Systems, and Digital Comms