More gain for SRS based weight as compared to PMI based weight

RAN
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1

Hi Experts.
Can you tell why there is 30% more gain for SRS based weight as compared to PMI based weight?

SRS carrier switching improves SCell capacity.
Massive MIMO performance improves by 30% when SRS-based weights are used (vs. PMI-based weights)

2

This is because SRS based weights are pointing the beam more precisely on user, with max gain/SINR on it, whereas PMI based weights are not so precise to point the beam with max on user.

3

Try reading this article to understand how different is srs and pmi weights: Types of beamforming in 5G: