ICI Cancellation Algorithm for OFDM Based Aeronautical Communication Systems and Its Performance Analysis

The aeronautical en-route communication channel is modeled as a two-ray double-selective channel. Based on the channel model, a low-complexity iteration self-cancellation algorithm is proposed to cancel the inter-carrier interference (ICI) of orthogonal frequency division multiplexing (OFDM) system in aeronautical communications. ICI can be completely suppressed by the proposed algorithm if channel parameters are estimated ideally. We analyzed the SNR loss with variant iteration times theoretically, and pointed out how to choose the optimum iteration times. The algorithm is especially useful to the situation with high aviation velocity, as less iteration is sufficient to separate the interference with larger Doppler shift, and less noise will be introduced. We carried out Monte Carlo simulation with typical aeronautical en-route channel, and the simulation results are in agreement with the deduced theoretical performance expressions and validate the effect of our cancellation algorithm.