Multi-User MIMO Channel Measurements Month Year doc.: IEEE 802.11-yy/xxxxr0 May 2009 doc.:IEEE 802.11-09/0574r0 Multi-User MIMO Channel Measurements Date: 2009-05-11 Authors: John Doe, Some Company

Month Year doc.: IEEE 802.11-yy/xxxxr0 May 2009 doc.:IEEE 802.11-09/0574r0 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

MU-MIMO Measurement Locations May 2009 doc.:IEEE 802.11-09/0574r0 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

MU-MIMO Setup (AP in Location 3) May 2009 doc.:IEEE 802.11-09/0574r0 MU-MIMO Setup (AP in Location 3)

DL MU-MIMO Simulation Overview May 2009 doc.:IEEE 802.11-09/0574r0 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

MU-MIMO Results: LOS (left) and NLOS (right) May 2009 doc.:IEEE 802.11-09/0574r0 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

May 2009 doc.:IEEE 802.11-09/0574r0 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.