Adaptive zero-crossing digital phase-locked loop for packet synchronization

This paper describes the design and performance analysis of a new approach for frequencysynchronization and transfer over packet networks. The proposed system utilizestimestamps-based with raised cosine pulse shaping first order adaptive zero-crossing digital phase-locked loop (AZC-DPLL). The system is designedto recover frequency as well as packets, independently of the input signal level in the presence of noise. This technique provides reliable locking by adjusting the loop gain, with the aid of finite state machine (FSM), and hence both system locking range and acquisition are improved.