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In this paper, the performance of cooperative networks introduced in the literature is analyzed for asynchronous Direct Sequence Code-Division-Multiple-Access (DS-CDMA) systems in frequency-selective slow fading environment. The authors show that the full benefits of cooperative diversity cannot be achieved if no multiuser interference suppression is employed at the cooperative end. They consider two scenarios; perfect and imperfect inter-user channel. The bit-error-rate performance of the cooperative system is investigated for an uplink transmission where a decorrelator detector is used at both the relay and base station receivers.
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