Pilot-Assisted OFDM Channel Estimation and ICI Cancellation for Double Selective Channels

In this paper, we develop a two-stage hybrid channel estimation and ICI cancellation structure for OFDM systems. The double selective channels are approximated by an improved basis expansion model (BEM), which is more accurate than the conventional BEM when the normalized Doppler frequency is smaller than one. Based on this improved model, a new ICI cancellation scheme is proposed to reduce ICI impact. Simulation results show that the framework performs well.