Multiuser Detection in Time- and Frequency-Domain Spread Multicarrier Code-Division Multiple-Access Systems

Lie-Liang Yang, Wei Hua and Lajos Hanzo

School of Electronics and Computer Science,
University of Southampton, SO17 1BJ, UK.
Tel: +44 (0)23 8059 3364, Fax: +44 (0)23 8059 3045


In this contribution we study a reduced-complexity multiuser detection aided multicarrier direct-sequence code-division multiple-access (MC DS-CDMA) scheme, which employs both time (T)-domain and frequency (F)-domain spreading. We investigate the achievable detection performance in the context of synchronous TF-domain spread MC DS-CDMA, when communicating over an additive white Gaussian noise (AWGN) channel. Five detection schemes are investigated, which include the single-user correlation based detector, the joint TF-domain decorrelating multiuser detector (MUD), the joint TF-domain MMSE MUD, the separate TF-domain decorrelating/MMSE MUD and the separate TF-domain MMSE/decorrelating MUD. Our simulation results show that the separate TF-domain MUD schemes are capable of achieving a similar bit error rate (BER) performance to that of the significantly more complex joint TF-domain MUD schemes.

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