Chase Based Multiuser Detection for MIMO-CDMA Systems

In multiuser MIMO-CDMA systems, the layered space-time multiuser detector (LAST-MUD) can achieve high data rate and reliable communication by combining time-domain technique and space-domain technique. At the receiver side of LAST-MUD, the mathematical expression of the signals passing through the space-code matched filters is similar to the received signals of the V-BLAST system. This similarity makes it possible to apply some advance detection schemes originally used in single user V-BLAST system to multiuser MIMO-CDMA system. Recently, the B-Chase and L-Chase detectors have been developed to improve V-BLAST system performance. In this paper, we investigate the use of these two Chase based schemes to MIMO-CDMA system. The simulation results show that the performance of the L-Chase detector is worse than LAST-MUD due to the error in noise estimation, while the B-Chase detector can achieve a better performance than LAST-MUD.