FFE-Aided CDR to Calibrate Phase Offset and Enhance Gain In Baud Rate Sampling Phase Detector

A method for clock data recovery (CDR), the method comprising:

• determining a phase code (PC) index table comprising a plurality of PC indices, wherein each PC index corresponds to a value for each of a plurality of coefficient values for an incremental feed forward equalizer (INC-FFE);
• adjusting the coefficients of the INC-FFE according to values in the PC index table corresponding to a first index;
• determining one of a signal-to-noise ratio (SNR) and a bit error rate (BER) with coefficients adjusted according to the values in the PC index table corresponding to the first index;
• repeating the adjusting the coefficients and the determining one of the SNR and the BER steps until a one of the SNR and the BER has been obtained for at least three PC indices in the PC index table;
• and
• calibrating the INC-FFE using the values in the PC index table corresponding to the PC index for which a best SNR or a best BER was obtained.

A network component, comprising:

• a processor;
• and
• a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
• determine a phase code (PC) index table comprising a plurality of PC indices, wherein each PC index corresponds to a value for each of a plurality of coefficient values for an incremental feed forward equalizer (INC-FFE);
• adjust the coefficients of the INC-FFE according to values in the PC index table corresponding to a first index;
• determine one of a signal-to-noise ratio (SNR) and a bit error rate (BER) with coefficients adjusted according to the values in the PC index table corresponding to the first index;
• repeat the instructions to adjust the coefficients and to determine one of the SNR and the BER steps until a one of the SNR and the BER has been obtained for at least three PC indices in the PC index table;
• and
• calibrate the INC-FFE using the values in the PC index table corresponding to the PC index for which a best SNR or a best BER was obtained.