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In this paper, a new blind equalization for multiuser multi-carrier code division multiple access (MC-CDMA) systems under Rayleigh multipath fading channel is proposed. The later causes the ICI and ISI that destroy the relationship of the guard interval (GI) redundancy. Through exploiting the structural properties of MC-CDMA transmitted signal, the estimation can be resolved using least square fitting (LSF) and subspace approaches. Indeed, GI redundancy together with excess codes (EC) are used to restore the MC-CDMA properties. In addition, we propose the use of the previous algorithms in conjunction with a constant modulus algorithm (CMA) to improve the performance gain. Our simulation results show the robustness and effectiveness of the proposed algorithms.

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