1. Multi-User MIMO Channel Measurements
Month Year
doc.: IEEE yy/xxxxr0
May doc.:IEEE /0574r0
Multi-User MIMO Channel Measurements
Date:
Authors:
John Doe, Some Company

2. Month Year
doc.: IEEE yy/xxxxr0
May doc.:IEEE /0574r0
Introduction
In the Jan and March IEEE meetings, QC presented channel meaurements in an indoor-enterprise environment, to support the TGac channel model addendum document.
We present results from a fresh set of measurements in a conference room setting, to further validate the TGac MU-MIMO channel model.
8 clients with 2 RX antennas each
λ/2 spaced dipoles
Arranged around conference room table
16 AP antennas – linear array, λ/2 spaced dipoles
AP positioned in three LOS locations (same room as clients) and two NLOS locations (outside the conference room)
Channel sounding system measures 20 MHz bandwidth channel
John Doe, Some Company

3. MU-MIMO Measurement Locations
May doc.:IEEE /0574r0
MU-MIMO Measurement Locations
Green circles show 8 client locations (2 antennas per client)
Red squares show 5 tested AP locations
Two AP orientations per location
1) AP array approximately broadside to clients
2) AP array approximately endfire to clients
Locations 1-3: LOS, AP in same room as clients
Locations 4-5: NLOS

4. MU-MIMO Setup (AP in Location 3)
May doc.:IEEE /0574r0
MU-MIMO Setup (AP in Location 3)

5. DL MU-MIMO Simulation Overview
May doc.:IEEE /0574r0
DL MU-MIMO Simulation Overview
Assumptions:
Assume TGn defined baseline parameters from B-LOS and D-NLOS .
For each client:
Apply random offset of ±180° to LOS AoA and AoD.
Apply random offset of ±180° to NLOS cluster AoA .
Apply random offset of ±30° to NLOS cluster AoD.
Note: The value ±30° for NLOS cluster AoD, is “TBD” in the current version of channel model document.
Capacity Analysis:
200 channel realizations generated per test case and scenario
MMSE precoder applied to each 16x16 channel instance
Post-processing SINRs calculated for each stream and subcarrier
PHY capacity for each stream/subcarrier calculated as log2(1+SINR)
For each instance, sum-average channel capacity calculated by averaging across subcarriers and summing across spatial streams
CDFs generated across all 200 channel instances

6. MU-MIMO Results: LOS (left) and NLOS (right)
May doc.:IEEE /0574r0
MU-MIMO Results: LOS (left) and NLOS (right)
Measurements (solid lines) compared to 5 instances of TGac MU-MIMO channel model.
Locations 1-3 compared to TGac MU-MIMO model based on Model B LOS
Measurements match or exceed all model predictions
Locations 4-5 compared to TGac MU-MIMO model based on Model D NLOS
Good agreement between measurements and model predictions

7. May doc.:IEEE /0574r0
Conclusions
Good agreement between fresh set of measurements and draft TGac MU-MIMO model.
Both LOS and NLOS scenarios
Supports that currently proposed TGac model extensions for multi-user MIMO are capable of predicting real-world performance.