System for five-level non-causal channel equalization
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Accused Products
Abstract
A system and method are provided for five-level non-causal channel equalization in a communications system. The method comprises: receiving a non-return to zero (NRZ) data stream input; establishing a five-level threshold; comparing the first bit estimate to a second bit value received prior to the first bit; comparing the first bit estimate to a third bit value received subsequent to the first bit; and, in response to the comparisons, determining the value of the first bit. Establishing a five-level threshold includes: establishing thresholds to distinguish a first bit value when the second and third bit values are a “1” value, when the second bit value is a “1” and the third bit value is a “0”, when the second bit value is a “0” and the third bit value is a “1”, when the second and third bit values are a “0” value, and an approximate midway threshold.
78 Citations
34 Claims
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1-17. -17. (canceled)
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18. A five-level non-causal channel equalization communication system, the system comprising:
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a multi-threshold decision circuit having an input to accept a non-return to zero (NRZ) data stream, an input to accept threshold values, and outputs to provide bit estimates responsive to five voltage threshold levels; and
,a non-causal circuit having inputs to accept bit estimates from the multi-threshold decision circuit, the non-causal circuit comparing a current bit estimate to bit value decisions made across a plurality of clock cycles, the non-causal circuit having an output to supply a bit value for the current bit estimate determined in response to the non-causal bit value comparisons. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34-52. -52. (canceled)
Specification