Recently I have seen this syntax about MU-MIMO:
axb:c:d:e, for example, 4x4:4:3:3.
I understand the first two numbers are the transmit and receive chains, and the third one is the number of spatial streams. What's the meaning of the fourth and fifth numbers?
The fourth number references how many (MU) multi user streams can be transmitted and the fifth number represents a MU-MIMO group or how many MU-MIMO clients are receiving the transmission at the same time.
Then, the third number represents the total spatial streams for a single client and the fourth number represents the spatial streams to different clients simultaneously?
In your example, with the fourth number (4), this would mean that 4 spatial streams are available for MU-MIMO clients. So this could be 4 clients all with a single stream. The fifth number (3) represents how many clients could belong to the MU-MIMO Group.
So, I believe an example would look like this
1x SS - MU-MIMO User
2x SS - MU-MIMO Group
Have you checked out the 802.11ax whitepaper, this explains it far better then I ever can :)
Also take a look at the below, this details further on combinations of valid groups.
All of the above is from my research and i'm certainly no expert :)
Ok, thanks for the links, I will check them out. Just the last question, about this:
Are you sure 4 clients simultaneously all with a single stream? Because the fifth number is 3 and then the AP will support up to 3 MU-MIMO clients simultaneously, but not 4.
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