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In OFDM system, cyclic prefix (CP) is necessary to combat intersymbol interference (ISI) and intercarrier interference (ICI). Employing CP simplifies the channel equalization, but results in a considerable bandwidth loss. In this paper, a multicarrier detection algorithm is proposed for OFDM system without CP, which implements the successive detection by decision-feedback equalizer (DFE) based on minimum mean-square error (MMSE) criterion. Simulation results show that the proposed scheme has higher bandwidth efficiency and better performance in bit error rate (BER).