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In this paper, an iterative joint channel-estimation and symbol-detection algorithm based on prediction is presented for orthogonal frequency-division multiplexing systems. Considering the correlation between impulse responses, we introduce the prediction method into the iterative channel estimation. The initial channel value of iterative estimation is predicted for each data symbol. Several prediction methods are simulated and compared with conventional algorithm. The simulation results show that contrasted to the conventional scheme, the proposed algorithm improves the convergence capability and system performance dramatically without excessive system complexity increase.