定时误差估计，精度很高，算法简单易于实现，很值得参考！-Timing error estimates, precision is high, the algorithm simple and easy to implement, it is worth considering!

This paper presents the simulation performance of the all-digital symbol timing recovery using the Gardner Timing Error Detector over π/4-DQPSK modulation. The open loop statistics, the S-curve and the normalized timing error variance, were investiga