FFT-speed and windowed multiuser detector for UTRA-FDD high rate data mode

The family of international standards for mobile. communications, IMT-2000, includes, amongst others, the universal terrestrial radio access (UTRA) proposal, which consists of two modes: frequency division duplex (FDD); time division duplex (TDD). A new approach based on the zero-forcing multiuser detector (ZF-MUD) is investigated for the high rate data mode in the UTRA-FDD uplink. This approach is compared to the FFT speed ZF-MUD (see Machauer, R. et al., Proc. IEEE 54th Vehicular Technology Conf., p. 502-5, 2001) which was originally introduced by M. Vollmer et al. (see Proc. Int. Conf. on Telecom., ICT, 1999) for use in UTRA-TDD. The multiple access interference (MAI) and intersymbol interference (ISI) reduction of these multiuser detectors leads to a high BER gain compared to the RAKE receiver. The computational complexity is reduced by taking advantage of the UTRA-FDD structure. Both algorithms can easily be adapted to parallel computation.