Abstract: Aiming at mitigating intercarrier interference (ICI) caused by channel time variation in orthogonal frequency division multiplexing (OFDM) systems, a low-complexity doubly iterative equalization scheme is proposed by exploiting the approximately banded structure of channel frequency response (CFR) matrix. The scalability of band size of CFR matrix enables a good tradeoff between performance and complexity. In this scheme, a linear ICI canceller is used to reduce performance degradation caused by the band approximation of CFR matrix, and an iterative equalizer with soft interference cancellation is employed to gain the Doppler diversity induced by channel time variation. Theoretic analysis and simulation results indicate that the proposed technique has both performance and complexity advantages over the classic linear minimum mean square error (MMSE) equalizer in time varying channels.