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针对UFMC系统中传统符号定时同步算法精度较低和不适用性的问题,根据UFMC符号的特性提出一种改进算法。通过分析训练符号的特性,得到首尾数据部分之和等于中间数据部分的特性,为此本文提出的算法除了参考传统符号同步算法利用数据重复的特性外,还利用了该特性,增加了训练符号数据的利用率,并且减小了噪声的影响,最后为了减小平台效应的影响而加入滑动平均窗,改进算法有效地增加了算法的精确度。仿真结果表明,改进算法在低信噪比条件下比传统的符号定时更加精确,具有更加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 unavailability of the traditional symbol timing synchronization algorithm in UFMC system, an improved algorithm is proposed according to the characteristics of UFMC symbol. By analyzing the characteristics of the training symbols, the sum of the first and last data parts is equal to the characteristics of the middle data part. Therefore, the proposed algorithm uses the characteristics of the data repetition with reference to the traditional symbol synchronization algorithm, and adds the training symbol data , And reduce the impact of noise. Finally, in order to reduce the effect of platform effects to join the sliding average window, the improved algorithm effectively increases the accuracy of the algorithm. The simulation results show that the improved algorithm is more accurate than the traditional symbol timing under the condition of low signal-to-noise ratio, and has smoother timing measurement function curve and lower root mean square error.