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建立了分数抽头均衡器(FSE)与定时同步相结合的信号模型,分析了定时误差对于均衡性能的影响,提出了一种新的基于FSE的快速定时同步算法。在未知参考序列相位的情况下,利用循环均衡快速收敛并建立同步。在相位跟踪阶段,利用抽头增益跟踪定时相位误差,通过对采样数据进行抽取或插值以及均衡器抽头的移位操作控制相位误差。仿真表明,该算法能在长度为均衡器抽头数的符号周期内快速建立同步,通过采样率的选择可以精确地控制定时相位误差。
A signal model combining fractional tap equalizer (FSE) with timing synchronization is established. The influence of timing error on the equalization performance is analyzed. A new fast timing synchronization algorithm based on FSE is proposed. In the unknown phase of the reference sequence, the use of cyclic equilibrium fast convergence and the establishment of synchronization. In the phase tracking phase, the tapped phase gain is used to track the timing phase error, and the phase error is controlled by decimation or interpolation of the sampled data and the equalizer tap shift operation. The simulation shows that the algorithm can quickly establish the synchronization in the symbol period whose length is equal to the number of equalizer taps, and the timing phase error can be precisely controlled by the selection of the sampling rate.