VARIABLE TIMING CONSTANT DECISION-DIRECTED TIMING RECOVERY METHOD

摘要

The present invention relates to a variable timing constant decision-directed timing recovery method, the method comprising: outputting an output value and a determination error value of an equalizer in an equalizer, having an absolute value in the determination error value, Comparing the absolute value of the determination error and the value of the threshold detector, selecting the compared output value among the adaptive coefficient values, adding the alpha and beta to the timing constants, and outputting the D / A Controlling the voltage-controlled oscillator through the converter, and optionally varying the timing constant according to the amount of error in the equalizer to accumulate the timing phase and, in the case of large crystal error, If the timing phase recovery speed is small and the error is small, it is possible to track the exact phase by applying the negative adaptation coefficient.