Minimum probability of error for asynchronous Gaussian multiple-access channels
IEEE Transactions on Information Theory
Elements of information theory
Elements of information theory
Wireless Communications: TDMA Versus CDMA
Wireless Communications: TDMA Versus CDMA
Parallel Interference Cancellation in Multiuser CDMA ChannelEstimation
Wireless Personal Communications: An International Journal
IEEE Transactions on Information Theory
Group detection for synchronous Gaussian code-division multiple-access channels
IEEE Transactions on Information Theory
Multi-user detection for DS-CDMA communications
IEEE Communications Magazine
The impact of timing errors on the performance of linear DS-CDMA receivers
IEEE Journal on Selected Areas in Communications
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Multiuser detectors for asynchronous multirate code-division multiple-access (CDMA) systems are considered. A multirate CDMA system model able to fit several system concepts in the same framework is presented. The performance of the multi-code (MC) system with one processing gain and the multiple processing gain (MPG) system is compared. Upper bounds for the expected value of the asymptotic multiuser efficiency of the decorrelating detector for a synchronous multirate CDMA system with three effective users are derived for a system with one and two processing gains. The numerical results show that the performance of the decorrelating detector for MC and MPG systems do not differ significantly. The bit error rates (BER) of the decorrelating, parallel interference canceler (PIC) and groupwise serial interference canceler (GSIC) with either PIC or decorrelator within the group are compared. The results show that the decorrelating and the GSIC detectors yield the best performance. For all interference cancellation schemes the BER saturates at high SNRs due to decision errors degrading the multiple-access interference (MAI) estimates.