Performance analysis of a dual-rate synchronous MC-CDMA system

We propose a novel dual-rate synchronous multi-carrier code division multiple access (MC-CDMA) system. In this system, all users are designed to have the same processing gain and share the same set of subcarriers. Two decorrelator-based receivers are implemented and analysed in this paper for the dual-rate MC-CDMA system; a high-rate decorrelator (HRD) matches high data rate and a low-rate decorrelator (LRD) matches low data rate. It has been proved that for low-rate users, HRD and LRD perform similarly, while for high-rate users, LRD outperforms HRD when the signature sequences of high-rate and low-rate users are not orthogonal. Furthermore, we propose a blind multiuser detection method, which can be implemented adaptively by applying the bootstrap algorithm. It is shown that the blind adaptive detector is near-far resistant and has performance similar to that of minimum mean square error (MMSE) detector