A Novel Multiuser Detection Using Group Classification with Smart Antennas for Multi—carrier CDMA Systems

摘要

The capacity of MC-CDMA communica-tion systems can be significantly enhanced by employing multiuser detection (MUD) techniques. In this paper, a group oriented MUD based on the combination of smart antennas and multiuser detection is presented. The pro-posed method is featured as a novel technique for further improving the system capacity and performance. In this method, all the users are first divided into several groups according to their impinging Direction of arrivals (DOA).All users with similar DOAs are classified into the same group and then MUD is employed in each group in parallel.Because spatial filtering cannot suppress all the interfer-ence between the groups, interference cancellation among groups is used prior to MUD within the groups. It is shown that the proposed group oriented MUD algorithm can sig-nificantly reduce the computational complexity and pro-cessing time delay compared with the conventional MUDschemes. Furthermore, it is demonstrated that significant performance improvement can be achieved.