In this paper we present and evaluate a pre-distortion scheme for the downlink of Wideband – Code Division Multiple Access (W-CDMA) systems considering a Rake in the receiver in order to exploit multipath diversity. Its performance is compared with schemes without the pre-distortion at the Base Station (BS), and combined with a Transmit Diversity (TD) scheme to improve the performance by exploiting spatial diversity.
It is shown that the proposed pre-distortion scheme allows receivers (Mobile Stations) with very low complexity, contrarily to the case where a post-processing Multi-User Detector (MUD) approach is adopted to improve the performance. Therefore, the proposed pre-distortion scheme can be seen as an alternative to post-processing schemes.