Signal processing device capable of enhancing correctness of feedback signals
First Claim
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1. A signal processing device for processing a received signal to generate a sliced signal, comprising:
- an equalizer for generating an equalized signal according to the received signal;
a multilevel quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels; and
a control logic for adopting one of the first mode and the second mode by executing the following steps;
adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the equalized signal with a predetermined value which is different from any of the sliced signal and the X threshold/thresholds for obtaining a second difference;
adopting the second mode instead of the first mode when the first difference and the second difference together indicate an unreliable status; and
adopting the first mode when the first difference and the second difference together indicate a reliable status.
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Abstract
A signal processing device for processing a passband signal to generate an equalized signal includes a passband adaptive equalizer for generating the equalized signal according to the passband signal, including at least one feed-forward equalizer (FFE) and one feedback equalizer (FBE), and a multilevel quantizer coupled with the passband adaptive equalizer for selectively utilizing a single predetermined threshold or a plurality of multiple predetermined thresholds to quantize the equalized signal in order to generate a sliced signal.
10 Citations
14 Claims
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1. A signal processing device for processing a received signal to generate a sliced signal, comprising:
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an equalizer for generating an equalized signal according to the received signal; a multilevel quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels; and a control logic for adopting one of the first mode and the second mode by executing the following steps; adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the equalized signal with a predetermined value which is different from any of the sliced signal and the X threshold/thresholds for obtaining a second difference; adopting the second mode instead of the first mode when the first difference and the second difference together indicate an unreliable status; and adopting the first mode when the first difference and the second difference together indicate a reliable status. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A signal processing device for generating a sliced signal according to a received signal, comprising:
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an equalizer for generating an equalized signal according to the received signal; a quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels; and a control logic for adopting one of the first mode and the second mode by executing the following steps; adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the first difference with a predetermined threshold which is different from any of the sliced signal and the X threshold/thresholds; adopting the second mode instead of the first mode when the first difference is larger than the predetermined threshold; and adopting the first mode when the first difference is smaller than the predetermined threshold. - View Dependent Claims (10, 11)
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12. A signal processing method for generating a sliced signal according to a received signal, comprising:
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generating an equalized signal according to the received signal; utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted; utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels; adopting the first mode and then subtracting the equalized signal from the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the first difference with a predetermined threshold which is different from any of the sliced signal and the X threshold/thresholds; adopting the second mode instead of the first mode when the first difference is larger than the predetermined threshold; and adopting the first mode when the first difference is smaller than the predetermined threshold. - View Dependent Claims (13, 14)
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Specification