Abstract: Based on the space alternating generalized expectation-maximization (SAGE) algorithm, and the ordered serial interference cancellation (OSIC) approach, an ICI mitigation algorithm is proposed for OFDM systems over multipath fading and rapidly time-varying channels. Computational complexity investigation and simulation results indicate that the proposed algorithm significantly outperforms the existing methods based on SAGE, with almost the same complexity, especially for the large Doppler shift. Therefore, the proposed algorithm is particularly well suited for highly mobile environments