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多普勒频偏是高速铁路环境下的宽带无线接入亟待解决的难点之一,以往的频偏校正方法将焦点集中于信号处理技术上,对于频偏校正性能的提升缓慢且有限。基于越来越准确的车载信息,提出了一种新的频偏校正方法。先利用高铁的车载信息,预先估算出频偏进行第一次补偿,再利用频偏估计相关算法估计和补偿残留频偏。仿真结果表明,方法复杂度低,补偿范围大,校正速度理想,能有效改善误码率。
Doppler frequency offset is one of the most difficult problems to be solved in broadband wireless access in high-speed railway. In the past, the frequency offset correction method focused on the signal processing technology, and the performance of frequency offset correction was slow and limited. Based on more and more accurate vehicle information, a new frequency offset correction method is proposed. The first use of high-speed rail vehicle information, pre-estimated frequency offset for the first compensation, and then use the frequency offset estimation algorithm to estimate and compensate for the residual frequency offset. The simulation results show that the method has low complexity, large compensation range and ideal correction speed, which can effectively improve the bit error rate.