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The Pilot-Symbol Assisted Modulation (PSAM) is an usual channel method for OFDM systems. On the basis of Windowed the fourth Discrete Cosine Transform (WDCT-IV), a new channel estimation iterative algorithm for OFDM systems is proposed. By exploiting the characteristics of iterative detection, the proposed algorithm inhibits the additive white Gaussian noise (AWGN) and inter-carrier interference (ICI) more effectively. Simulation result shows that the technique is effective and the system performance is better than one of Ref. under the multipath fading channels.