Figure 9
From: User scheduling for MU-MIMO transmission with active CSI feedback
Throughput according to the number of AP antennas. The large number of AP antennas increases the size of the CSI feedback frame. Thus, requesting many users’ CSI for scheduling may limit the scheduling gain significantly, as shown in the result of SUS. However, 802.11ac+ can obtain higher throughput gain over both protocols due to the limited feedback.