Adaptive Duplicated Filters and Interference Canceller for DS-CDMA Systems: Part I - Algorithm

A multistage multiuser detection (MUD) technique, the adaptive duplicated filters plus interference canceller (ADIC), is proposed in the DS-CDMA context. Of particular interest is the use of adaptive filters block (AFB) dedicated to each user with its respective input signals independent from other users´ contributions. These AFB are mixed with interference canceller block in a cascade arrangement. As shown in this paper, this proposed MUD can outperform the decision feedback soft multistage interference canceller (DF-Soft-MPIC) MUD with complexity reduction of 4. Algorithmic description and performance of low complexity MUD method are considered in this paper and FPGA implementation in a companion paper, Part II.