基于EM的导频数据联合辅助频偏估计算法

针对突发通信系统在保证频率估计精度和频谱效率时存在的矛盾，提出了一种基于EM算法结构的导频与数据联合辅助的频偏估计算法，在此基础之上进而提出了改进的递归EM估计算法。理论分析和仿真实验表明，相比于仅使用导频的估计算法，联合使用导频和数据进行频偏估计的性能更加精确，在高信噪比下达到了使用更多导频符号估计的克拉美罗下界，并且在低信噪比条件下，其性能要优于非数据辅助的盲估计算法。

EM-based frequency offset estimation algorithm with pilot-data assisted jointly

A frequency offset estimation algorithm with pilot-data assisted jointly based on the framework of the Expectation-Maxi-mum(EM)algorithm is proposed in order to deal with the conflict between estimation accuracy and spectral efficiency for burst-mode transmission systems.Furthermore,the improved recursive EM estimation algorithm is proposed.Theoretical analysis and simu-lation results show that it is more accurate to estimate frequency offset from both pilot symbols and data symbols than from pilot symbols ...