Provided by: The Science and Information (SAI) Organization
Date Added: May 2013
The combination of Multi-User Multiple-Input Multiple-Output (MU-MIMO) technology with Orthogonal Frequency Division Multiplexing (OFDM) is an attractive solution for next generation of Wireless Local Area Networks (WLANs), currently standardized within IEEE 802.11ac, and the Fourth-Generation (4G) mobile cellular wireless systems to achieve a very high system throughput while satisfying Quality of Service (QoS) constraints. In particular, Block Diagonalization (BD) scheme is a low-complexity pre-coding technique for MU-MIMO downlink channels, which completely pre-cancels the multiuser interference. The major issue of the BD scheme is that the number of users that can be simultaneously supported is limited by the ratio of the number of base station transmit antennas to the number of user receive antennas.