LTE高铁环境下OFDM载波间干扰消除优化研究

Research on Improvement of OFDM Inter-carrier Interference Elimination in High-speed Railway LTE Environment

对高速铁路LTE环境下OFDM载波间干扰消除算法进行深入研究,针对传统载波间干扰消除算法性能不佳问题,对列车高速移动下的通信非恒定时变信道进行重新建模,在此基础上提出一种OFDM载波间干扰消除的联合优化算法。算法以循环序列前缀作为保护间隔,对各子序列进行线性加权,有效降低了接收信号的干扰,消弱了系统子载波频偏的易感性,通过仿真验证此联合优化算法能有效改善系统信干比性能,使列车在高速运行环境中通信更加稳定可靠。

In this paper,the OFDM inter-carrier interference elimination algorithm under high-speed railway LTE environment was studied in depth.Aiming at the poor performance of the traditional inter-carrier interference elimination algorithm,the unsteady time-varying communication channel under high-speed train movement was remodeled.On this basis,a joint optimization algorithm for OFDM inter-carrier interference elimination was proposed.The algorithm with cyclic sequence prefixes as protection,and linear weight on each subsequence,effectively reduces the interference of received signal,and weakens the susceptibility of the subcarrier frequency deviation system.The joint optimization algorithm can effectively improve the signal-to-interference ratio performance,and provide more stable and reliable train communication under the high-speed operating environment.