Intra-symbol Piecewise Equalization for OFDM Systems in Fast Fading Channels

Based on intra-symbol piecewise linear channel model, a novel piecewise equalizer is proposed for OFDM systems in high mobility environment. In this proposed scheme the complex ICI caused by fast fading channels has been resolved as new OFDM subsystems’ simple ISI and lower ICI, respectively caused by the average channel and the time-varying channel over a piece-period. By further employing the characteristics of the channel matrix, a successive ‘ISI’ and ‘ICI’ mitigation based equalization with low complexity has been realized. Simulation results show that the proposed scheme has lower computation complexity than the comparative one, while perserving good performance.