无线突发通信全数字接收机时钟恢复算法

All digital receiver timing adjustment algorithm in wireless burst communication

Gardner算法是全数字接收机无数据辅助时钟恢复常用方法,但该算法是针对连续通信模式提出的,收敛时间较长,无法直接应用于数据量较少的突发通信模式。该文对传统的Gardner算法进行修正,提出循环Gardner算法,采用先存储再处理的方式,正反相间反复利用有限数据,实现对每一帧突发数据独立完成时钟恢复。采用循环Gardner算法,正反计算具有明显的对称特征,保证正反相间利用数据与利用连续数据取得近乎一致的计算效果。

Gardner algorithm,a commonly used non-data-aided timing adjustment algorithm in all digital receivers,is presented for continuous communication mode and needs long time to converge,which is unsuitable for burst communication.A modified algorithm,the circular Gardner algorithm,was developed with the data first being stored and then being read forward and backward alternatively to finish timing adjustment for every frame burst data independently.The circular Gardner algorithm has a distinct symmetry characteristic in forward and backward processes,which guarantees the algorithm to acquire nearly the same effect as when using continuous data in the conventional Gardner algorithm.