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Frequency selective fading octurs due to the Do ppler Effect in mobile communication systems. The performances of the systems are rapidly reduced due to effect of multiuser inter ference under frequency selective channels at OS-COMA systems.To overcome these problems, we adopted the multi-carrier modu lation techniques, and it is able to solve the frequency selective channel effects by means of these modulation techniques, and interference problems due to multiuser access are solved by means of multiuser detection techniques. In this paper, we pro posed the blind MOE/PIC multiuser detection method which is composed of both the blind multiuser detection technique and parQllei interference canceller. Thus, simulation results show that the proposed method performs better than conventional metbods.