Statistics-based channel estimation and ici mitigation in OFDM system over high mobility channel

摘要

In this paper, we propose a statistics-based channel estimation and inter-carriers interference (ICI) mitigation scheme for the orthogonal frequency division multiplexing (OFDM) transmission over high speed railway communication. The proposed scheme offers a new channel estimation method based on compressed sensing by utilizing the sparsity of high speed train (HST) in the time domain channel. The wireless channel is expressed by a weighted time-domain channel interpolation. The interpolation weights are designed according to the channel statistics, and the position of the selected parameter of each path is designed based on coherence of the model structure. Furthermore, by utilizing the channel statistics, we develop the receive post-processing in the receiver for ICI mitigation. Numerical and simulation results verify the effectiveness of the proposed schemes.