UFMC系统的符号定时同步改进算法

Improved Symbol Timing Synchronization Algorithm for UFMC System

在通用滤波多载波(UFMC)系统中,传统符号定时同步算法精度较低,适用性较差。为此,根据UFMC符号的特性,提出一种改进的符号定时同步算法。通过分析训练符号得出首尾数据之和等于中间数据的特性,参考传统算法利用数据的重复特性,结合两者来增加训练符号数据的利用率并减小噪声的影响。同时,加入滑动平均窗操作以改善平台效应。仿真结果表明,相对基于S&C的符号同步算法,该算法符号定时更精确,具有更平滑的定时测度函数曲线以及更低的均方根误差。

Aiming at the problem of low precision and poor applicability of traditional symbol timing synchronization algorithm in Universal Filtered Multi-Carrier(UFMC)system,an improved symbol timing synchronization algorithm is proposed according to the characteristics of UFMC symbols.After analyzing the training symbols,the characteristic is get that the sum of the first part and the last part is equal to the middle part.By referring to the characteristics of data duplication in traditional algorithms,the utilization rate of the training symbols data is increased and the influence of noise is reduced by combining the two characteristics.At the same time,sliding average window operation is added to improve the platform effect.Simulation results show that compared with S&C based symbol synchronization algorithm,this algorithm has more accurate symbol timing,smoother timing measure function curve and lower root mean square error.