Soft Information Assisted Space-Time Multiuser Detection for Multipath CDMA

This paper presents an effective space-time multiuser detection (MUD) with the assistance of soft information in multipath code division multiple access (CDMA) channels. The space-time MUD considered is a separable spatial-temporal filter which consists of a single spatial filter and temporal filter. The soft information determined from the previous iteration is then exchanged in the alternating updates of either the spatial or temporal filters. The conducted simulations show that the proposed scheme can offer substantial performance improvement compared with previous works, especially in highly loaded scenarios.