Cascade Filter MUD Scheme for a DS-CDMA Multirate Environment

A.O. Dahmane and P.-L. Sylvestre (Canada)


DS-CDMA, Decision directed receivers, Minimum Mean Square Error, Multiple Access Interference, Multi-user detectors, Multirate.


UMTS is based on direct-sequence code division multiple access (DS-CDMA) systems where users sharing the link communicate at different rates. In this paper, a multirate Cascade Filter Multi-User Detector (M-CF-MUD) is proposed in order to mitigate multiple access interference (MAI) and intersymbol interference (ISI) leading to an increase in capacity. The receiver takes into account the multirate nature of the UMTS signal based on variable length codes to determine the way users should be detected. A procedure based on virtual users is applied. It will be shown that the proposed M-CF-MUD behaves very well in a loaded environment and outperforms the conventional Rake receiver and the multistage parallel interference cancellation technique.

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