Author(s): WANG Chuan, QIU Ling, Personal Communication Network & Spread Spectrum Laboratory, University of Science and Technology of China
Pages: 378-383
Year: 2015 Issue:  3
Journal: Journal of the Graduate School of the Chinese Academy of Sciences
Keyword:  MU-MIMO; relay; RBD; MMSE;
Abstract: A linear transceiver optimization design based on the regularized block diagonalization( RBD) algorithm is proposed for the multiuser multiple-input multiple-output( MU-MIMO) relay downlink system. Considering that the source can not obtain the channel state information( CSI) of the second hop and the user can not obtain the CSI of the first hop,we optimize the transceiver design for the source-relay link and the relay-multiuser link,respectively. We use RBD algorithm at the relay to reduce the multiuser interference and noise,and then joint the receiver matrix to design an improved iterative algorithm based on the minimum mean square error( MMSE) criterion.Simulation results show that the proposed algorithm converges to a fixed value in a few iterations and it has a good bit error rate( BER) performance within the low signal-to-noise ratio( SNR) region.