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针对OFDM技术中的载波频率同步问题,分析了载波频率偏差对OFDM系统造成的影响,总结了基于IEEE802.11标准的三种常见的频偏估计算法:基于循环前缀的最大似然算法、基于训练序列的时域相关算法和基于导频的频域相关算法,提出一种基于训练序列和导频的联合载波频偏估计算法。性能仿真结果表明,该联合估计算法在估计范围和估计精度上具有明显的优势,适合实际工程应用。
Aiming at the problem of carrier frequency synchronization in OFDM, the influence of carrier frequency deviation on OFDM system is analyzed. Three common frequency offset estimation algorithms based on IEEE802.11 are summarized: the maximum likelihood algorithm based on cyclic prefix, Time-domain correlation algorithm and pilot-based frequency-domain correlation algorithm, a joint carrier frequency offset estimation algorithm based on training sequence and pilot is proposed. The performance simulation results show that the joint estimation algorithm has obvious advantages in estimation range and estimation accuracy, which is suitable for practical engineering applications.