How transmission scheme with 1 or 2 code word with upto 8 layers are related to number of beam, SU MIMO (closed loop & open loop) and MU MIMO?

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Hi Experts,

In Transmission Scheme 1:
How transmission scheme with 1 or 2 code word with upto 8 layers are related to number of beam, SU MIMO (closed loop & open loop) and MU MIMO?

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