ICA based Blind Multi User Detection for DS-CDMA Systems

Abstract

In this paper, we present an Independent Component Analysis (ICA) based detection approach for Direct Sequence Code Division Multiple Access (DS-CDMA) systems. Similar to conventional matched filter receivers, the proposed receiver is based on only the spreading code and timing information of the desired user. However, its performance is much better than the conventional receiver and it is comparable to other multiuser detection techniques based on training sequences or knowledge of spreading codes, delays and amplitudes of all the interfering users. In a practical DS-CDMA system, the interfering users keep on changing. This makes the wireless environment highly dynamic. Therefore, the multiuser detection techniques requiring complete information about interfering users are not spectrum efficient. The proposed technique does not require information about the interfering users and thus can handle changing wireless conditions. We illustrate the comparison of Bit Error Rate (BER) of the proposed approach with conventional matched filter receiver and other multiuser detection approaches. Simulation results show the effectiveness of the proposed approach.