滤波器组多载波系统的高精度符号定时估计

High precision symbol timing estimation for FBMC systems

针对滤波器组多载波（FBMC）系统的传统定时同步算法精度较低的问题，研究了其发送信号统计特性，从理论上量化分析了受数据符号重叠影响部分和非重叠部分的同步训练数据的特性，在此基础上提出了一种适用的高精度符号定时估计算法。该算法通过传输一串长度大于滤波器重叠因子的连续相同的训练符号，使得时域合成信号具有多重延迟冗余特性。仿真结果表明，该算法定时精度优于传统方法。

In view of the low precision problem of conventional timing estimation algorithms for filter bank-based muhicarrier （FBMC） systems, the paper proposes a high precision symbol timing estimation method based on the study of the statistical characteristics of transmitting signals and the theoretically quantitative analysis of the characteristics of synchronization training symbols that includes non-overlapping parts. The new method uses the transmission of same and sequential train- ing symbols, the length of which is greater than the overlap factor of the filter, to make the system time-domain synthetic signal with the features of multiple delayed redundancy. The simulation results show that the accuracy of the proposed algorithm is better than traditional methods.