Sampling phase optimization for digital modulated signals

Abstract

System and method of timing recovery to achieve sampling phase optimization with aid of equalization adaptation. For equalizer filter, the offset between a current Center of Filter (COF) value and a nominal COF value is used as a measure for a clock phase correction resulted from an adaptive equalization process. A COF may be defined as a function of two selected tap weights or equal to a selected tap weight. The nominal COF value can be dynamically adapted based on the real-time sampling phase error. The tap weights of the equalizer filter are adjusted to decrease the offset, e.g., by interpolating/extrapolating selected tap weights based on the offset. By using sampling phase error as a feedback for COF_nom updating and so for equalization adaptation, the clock delay correction contributed by the adaptive equalization process is advantageously controlled to benefit sampling phase optimization.