NTT Communication Science Laboratories
This paper presents indoor experimental results on an implemented real-time DownLink MultiUser Multiple-Input Multiple-Output (DL-MU-MIMO) transceiver for next generation wireless LAN systems. In the transceiver, Channel State Information (CSI) is estimated at each STAtion (STA) and fed back to an Access Point (AP) on a real-time basis. At the AP, transmit beam-forming weight for DL-MU-MIMO transmission is calculated by using the estimated CSI. This paper also proposes a fast computation scheme for computing transmit weight in real time. Indoor experiments with the DL-MU-MIMO transceiver demonstrate its feasibility.