Blind multiuser detection for MC-CDMA systems

This paper deals with blind multiuser detection for asynchronous multicarrier code-division multiple-access (MC-CDMA) systems. A two-stage linear multiuser detector is proposed, where the first stage performs preliminary disturbance mitigation, allowing thus the second stage, based on the constant modulus algorithm (CMA), to operate with nearly disturbance-free data. The proposed receiver is totally blind, since it needs only a coarse synchronization to the desired user´s transmission and knowledge of its spreading code. The effectiveness of the proposed approach is corroborated by computer simulation results, which show that, even with small sample size values, the proposed detector achieves performances close to (and often superior than) those of the non-blind minimum-mean-square error (MMSE) receiver.