Abstract: In high mobility orthogonal frequency division multiplexing (OFDM) systems, temporal time-variation of mobile channel induces intercarrier interference, leading to performance degradation. In order to combat ICI, a novel equalization method for OFDM systems in time-varying wireless channels is presented. By taking advantage of subblock tracking, whose aim is to force each subblock of one OFDM block as time-invariant such that channel equalization can be performed by a time-invariant structure. Meanwhile, signal-to-interference-plus-noise ratio (SINR) is numerically evaluated and derived as a close-form expression to further optimize the types of window functions. Simulation results show that the proposed scheme outperforms the conventional schemes, while requiring a lower complexity.