Regard to single user MIMO to multi user MIMO, what are difference between both modes?
Meaning lets say I have one cell with 32 UEs connected to it, running througput in all, then is it called multi-user MIMO?
MU-MIMO means when more / multiple users are scheduled using same slots and same PRBs, being space separated in different beams.
Everything else is SU-MIMO.
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Ahhh got you!
So assume it’s mu-mimo with 4 users.
Assume also max cell throughput is 500 Mbps.
So by mu-mimo mode, if let’s say each user is pumping 500 Mbps, then we can have 4 × 500 throughput.
But on su-mimo max throughput is 500 Mbps irrelative to how many UEs pumping max throughput (throughput is divided on users per slot ob that case).
Yup?
With mu-mimo:
- Capacity gain only seen in cell
- Marginal cell throughout improvement
- Avg user throughput degrade.
MIMO means using multiple antennas at transmitter and receiver.
If you have 4 channels (4 specially separated paths) at the transmitter, then you can use them for 1 UE or multiple UEs.
MU means multiple users.
MU-MIMO means putting more than 1 user spatially.
2 UEs are separated, not in frequency, not in time, but in space having the same time frequency resources.
If you have 4 channels you can give them to 4 UEs, 1 to each.
You can give them to 2 UEs, 2 channels to each.
You can give them to 1 UE, all 4 channels to 1 UE (this is SU-MIMO).