The Codex Lab

Field notes / 006

MU-MIMO Explorer

Multi-user MIMO lets one access point talk to several clients in the same transmission, each on its own spatial stream. Step through the sounding and grouping cycle, then work out when grouping actually buys you airtime.

Four clients in different directions, all able to be sounded — the textbook grouping case.

AP4×4Laptop2×2Phone1×1Tablet2×2TV stick1×1NDPAAP → clients
The AP sends a null data packet announcement naming the clients it wants to measure. Everyone else defers.

Step 1 / 6