A.O. Dahmane and D. Massicotte (Canada)
Multiuser detection (MUD), DSP, VLSI implementation, WCDMA, Wireless communication, 3G.
The WCDMA (Wideband Codes Division Multiple Access)
immerged as a solution for the third generation (3G) wireless
systems to meet the requirements of the market. To achieve
high-speed transmission, dictated by multi-media transport
on the cellular phones, more reliable receivers must be used.
One of the key blocks bringing out the performance
improvement to the receiver is the use of multiuser detectors
(MUD) to perform channel equalization and MAI
suppressers which are the subject of this paper. An
introduction on the Rake receivers, MMSE, interference
cancellation detectors and TDMA equalizers applied to the
CDMA is presented. The inefficiency of the Rake receiver,
proposed in actual systems, in a typical UMTS environment
is shown. Moreover, the possibilities of their implementation
in VLSI technology and/or DSP are discussed.