一种用于全数字接收机的位同步算法

A symbol timing synchronization algorithm for all digital receiver

设计了一种适用于全数字遥测接收机的位同步算法,该算法采用固定的采样速率,结合Farrow多项式内插算法与Gardner定时误差检测算法的优点,具有较宽的码速率适用范围,较低的信噪比适用环境。在分析Farrow多项式内插原理的基础上,采用一种简化的分段抛物线内插方法,此方法减少了原有内插方法的运算量。仿真结果表明,在单个码元采样点很少的情况下,其误比特率(BER)性能依然接近于理想BER性能,优于Gardner算法,能够有效地完成低信噪比条件下的位同步,因此有着良好的应用前景。

A symbol timing synchronization algorithm for all digital telemetry receiver is designed. The new algorithm combines the advantages of Farrow interpolation algorithm and Gardner timing error detection algorithm with fixed sampling rate,which is suitable for symbol timing synchronization with a wide range of symbol rate and low Signal to Noise Ratio(SNR). Based on the analysis of the Farrow interpolation principle, a simplified piecewise parabolic interpolation method is put forward to reduce the complexity of the original interpolation method. The simulation results show that the Bit Error Rate(BER) performance of the new algorithm is close to the ideal BER performance, and is better than that of Gardner algorithm with a small number of sampling points in a symbol. The new algorithm can achieve the symbol timing synchronization under low SNR effectively.