A simple and efficient delay estimator for short burst DS-SS signal

The delay lock loop (DLL) is a prevailing approach to synchronizing a direct sequence spread spectrum (DS-SS) signal, but the analysis and results are mainly applied to its steady state behavior. In some burst situations, DLL (or some other closed tracking loop) may be in transient state, or unable to lock the signal with high accuracy in the given time interval. The authors propose a simple and efficient delay estimation interpolation method to such burst circumstances and consider the channel filter distortion effect at the same time.