Multiple Antennas and Multipass Structure for Adaptive Duplicated Filters and Interference Canceller in WCDMA Systems

Abstract

An adaptive multistage multiuser detection (MUD) method namely adaptive duplicated filters and interference canceller (ADIC), has been proposed in a uplink WCDMA context. It was shown that ADIC approach provides, in a single receive antenna scenario, the same performance as the decision feedback soft multistage parallel interference canceller (DF-soft-MPIC) while affording a complexity reduction by a factor of 4. This paper proposes and analyses new versions of ADIC: the first efficiently takes into account the diversity offered by in a multiple receiving antennas context and the second aims at improving the performance based on multipass channel estimation and joint ADIC MUD, referred herein as MADIC. With respect to performance and implementation complexity trade-offs, MADIC presents a good avenue for WCDMA base station compared to DF-soft-MPIC.