Timing recovery of PAM signals using baud rate interpolation

摘要

A timing recovery method enables interpolation of PAM signals sampled at baud rate. The method exploits the structure of the PAM signal and also the smoothness of the channel pulse response. The resulting interpolator is an adaptive linear filter; and its taps can be adapted with the LMS algorithm. Using this interpolator enables a user to significantly reduce the complexity of the analog clock control circuit. A Gigabit Ethernet receiver that controls the A/D clock by selecting one of several evenly space clock phases, for example, reduced the required number of clock phases from 64 to 16.