TECHNIQUES FOR ADAPTIVELY ADJUSTING DECISION LEVELS OF A PAM-N DECISION FEEDBACK EQUALIZER
First Claim
1. A multi-level pulse amplitude modulation (PAM-N) decision feedback equalizer (DFE), comprising:
- a coefficient computation unit for setting feedback coefficients of the DFE;
a feedback unit that mitigates, using the feedback coefficients, effects of interference from data symbols that are adjacent in time to an input PAM-N data symbol;
an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and
a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit.
2 Assignments
0 Petitions
Accused Products
Abstract
A PAM-N decision feedback equalizer (DFE) comprises a coefficient computation unit; a feedback unit that mitigates, using computed feedback coefficients, effects of interference from data symbols; an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit.
22 Citations
20 Claims
-
1. A multi-level pulse amplitude modulation (PAM-N) decision feedback equalizer (DFE), comprising:
-
a coefficient computation unit for setting feedback coefficients of the DFE; a feedback unit that mitigates, using the feedback coefficients, effects of interference from data symbols that are adjacent in time to an input PAM-N data symbol; an error-and-decision unit for at least computing a least error value respective to one of a plurality of decision levels, wherein the least error value indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein the one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and a calibration unit for adaptively setting the plurality of decision levels based, in part, on the least error value, thereby enabling for compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received and further compensating for embedded offsets of the error-and-decision unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for adaptively adjusting a plurality of decision levels of a N-pulse amplitude modulation (PAM-N) decision feedback equalizer (DFE), comprising:
-
setting feedback coefficients of the DFE; mitigating, using the feedback coefficients, effects of interference from data symbols that are adjacent in time to an input PAM-N data symbol; computing a least error respective of one of the plurality of decision levels, wherein the least error indicates a difference of a pseudo equalized input PAM-N data symbol from an optimal position of the one of the plurality of decision levels, wherein one of the plurality of decision levels corresponds to a modulation level used to modulate data in the input PAM-N data symbol; and adaptively setting the plurality of decision levels based, in part, on the least error, thereby compensating for gain changes resulted by a cable on which the input PAM-N data symbol is received. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification