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The paper deals with a multiuser cancellation-detection scheme combined with an antenna array for wideband code-division multiple-access (WCDMA) communication systems in which different traffic loads and data rates are considered. This receiver, defined as a space-time selective parallel interference-cancellation detector, should be used at the base station of a WCDMA communication system. Asynchronous users and multipath fading phenomena are considered. The receiver basic assumption is to divide signals into two different groups according to the received power level. The reliable signals are directly detected and cancelled from the whole received signal at each sensor before making the decision about unreliable signals without any further processing delay. Performance evaluations have been carried out in terms of Pe (bit error probability) by means of computer simulations. In particular, it is shown that our receiver exhibits good behavior and lowers the computational complexity in comparison with previously proposed alternatives.
Date of Publication: July 2003