基于间隔导频的最优迭代频偏估计算法

摘要

In order to solve the problems of limited operating range in carrier frequency synchronization based on spaced-embedded pilot,a novel estimation algorithm using optimal iteration was proposed.The approach could compute and update the iterative weighting factor,which was used to correct sub-optimal estimation.Phase un-wrapping was applied to yield a larger estimation range for each iteration.A pilot design reference was acquired with considering the estimation accuracy and signal-to-noise ratio threshold.The simulation results were presen-ted to substantiate the performance of the modified algorithm.It was exhibited that the algorithm had wider op-erating ranges compared with differential phase algorithms,while maintaining high accuracy.%针对利用间隔导频进行载波频偏估计存在精度高但估计范围小的问题，提出了基于间隔导频的最优迭代频偏估计算法。该算法在迭代过程中通过计算更新迭代权重因子，对每次相位展开后的次优估值进行修正。基于本算法推导出综合考虑估计精度和信噪比阈值的导频设计参考式，为宽带短波系统快速准确同步参数提供帧格式设计参考依据。仿真结果表明，本算法较差分相位法有更大的估计范围，且估计精度高。