一种频域OFDM系统载波频偏估计方法

针对现有载波频偏估计算法存在复杂度高、频率估计精度差、估计结果均方误差大等缺点，提出了一种低复杂度的多导频频偏联合估计算法。该算法采用恒包络零自相关的CAZAC序列作为导频序列，运用最大似然法，迭代法进行载波频偏估计。仿真结果表明，相比于传统的载波频偏估计算法，文章算法复杂度低，具有更好的载波频偏估计性能。

A carrier frequency offset estimation algorithm for OFDM

Joint Pilots estimation of the carriers frequency offsets of OFDM system with computationally efficiency is developed to overcome the drawbacks such as high complexity,poor frequency estimation performance of single pilot estimation and significant mean square errors deviation of the estimate results. With the constant amplitude zero autocorrelations (CAZAC) sequence as the pilot sequence,the CFO is calculated by using the maximum likelihood method and iterative algorithm. Numerical simulations indicates that the proposed low complexity CFO estimation outperforms standard CFO estimation methods in terms of accuracy and computationally efficiency compared to the traditional estimation algorithm.