Multiuser Detection
Wcdma for Umts
Asynchronous Interference Mitigation in Cooperative Base Station Systems
IEEE Transactions on Wireless Communications
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Dynamic assignment of orthogonal variable-spreading-factor codes in W-CDMA
IEEE Journal on Selected Areas in Communications
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This paper introduces and analyses a novel uplink CDMA pairing diversity technique. In particular, this paper considers the use of orthogonal polyphase (OPP) sequences on the synchronous and asynchronous uplink to benefit from the codes' good cross-correlation properties. A code allocation algorithm is also presented in this paper that aims to exploit the cross-correlation properties to achieve the best possible system performance. For the sake of comprehensiveness, the paper compares the performance of this new diversity technique with a conventional pairing diversity technique and with the well known maximum gain combined (MGC) time diversity. The results show that the proposed algorithm outperforms the conventional pairing technique, in terms of BER, and with proper code allocation, is also able to outperform time diversity systems. The new algorithm is able to accommodate up to 200% system loading even under severe asynchronous and multipath conditions.