一种抗频偏的定时同步方法及其性能分析  

An Anti-Frequency Offset Time Synchronization Method and Its Performance Analysis

作　　者：付博炜 李明齐[1] FU Bowei;LI Mingqi(Shanghai Advanced Research Institute,Chinese Academy of Science,Shanghai 201210,China;School of Information Science and Technology,ShanghaiTech University,Shanghai 201210,China;University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]上海科技大学信息学院,上海201210 [3]中国科学院大学,北京100049

出　　处：《电讯技术》2021年第6期744-749,共6页Telecommunication Engineering

基　　金：国家重点研发计划(2019YFF0216603,2019YFB1802703)。

摘　　要：针对长序列互相关定时同步性能受频偏影响的问题,提出了一种分段频偏补偿的定时同步算法。该算法在分段互相关的基础上,使用频偏补偿替代传统的绝对值操作,在减少载波频偏对同步峰值影响的同时不增加噪声均值。理论分析和仿真结果表明,改进方法定时同步性能优于传统分段方法,适用于低信噪比大频偏的无线通信系统。To solve the problem that the timing synchronization performance of long sequence cross-correlation is affected by frequency offset,a timing synchronization algorithm of segment cross-correlation with frequency offset compensation is proposed.Based on segment cross-correlation,the algorithm uses frequency offset compensation instead of the traditional absolute value operation,which can reduce the effect of carrier frequency offset on the synchronous peak without increasing the mean noise a lot.Theoretical analysis and simulation results show that the improved method has better timing synchronization performance than the traditional segmentation method and is suitable for wireless communication systems with low signal-to-noise ratio and large frequency offset.

关 键 词：无线通信 定时同步 互相关 载波频偏 分段频偏补偿 

分 类 号：TN92[电子电信—通信与信息系统]