基于内插的OFDM系统采样时钟恢复研究

Study on Interpolation-based Sampling Clock Recovery for OFDM Systems

数字内插滤波器全数字化恢复采样时钟已广泛应用于OFDM系统数字接收机中。文中给出了基于数字内插采样时钟恢复的完整推导过程,采用Farrow结构的数字滤波器,同时用拉格朗日内插方法对采样信号进行数字内插,完成收发两端之间采样时钟的完全匹配。仿真结果表明,该方案能够很好地跟踪采样时钟偏差,快速实现采样时钟的恢复。

Digital interpolation filters have been widely used in sampling clock recovery for all digital OFDM receivers. In this paper, Farrow structured filters are used while Lagrange method is employed to interpolate sampling signals, thus realizing the full matching of sampling clock between the receiver and transmitter Simulation results show that the solution is efficient to track out the sampling offset and can recover sampling clock well.