An efficient block diagonalization method for multiuser MIMO downlink

Block diagonalization (BD) based on singular value decomposition (SVD) is a well-known precoding method that eliminates interuser interference in multiuser multi-input multi-output (MIMO) broadcast channels, but it is computationally inefficient. In this paper, we propose an alternative method replacing SVD to obtain the precoding matrix in the BD scheme. Analysis and simulation results show that our proposal has lower complexity than the conventional BD method, while there is no any degradation in sum throughput.