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Research on Inter-Carrier Interference Elimination Algorithms in High-Speed Railway Scenarios

In high-speed railway scenarios, the Doppler frequency shift caused by the high-speed movement of the mobile terminal causes the time-varying characteristics of the channel, which exacerbates inter-carrier interference. This paper studies the process of downloading the signal in the high-speed railway LTE environment, and models the time-varying channel in the high-speed scenario. Based on the research of traditional ICI cancellation algorithm, an improved joint optimization algorithm for ICI cancellation is proposed. Aiming at the characteristics of high-speed scenes, by first using a cyclic prefix sequence as a guard interval, and then performing a linear weighting function on each subsequence, this can reduce the system's sensitivity to the subcarrier frequency offset and thus reduce the interference of the received symbols.