一种抗频偏的定时同步方法及其性能分析

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.

An anti-frequency offset time synchronization method and its performance analysis

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.