Pattern-dependent equalization and detection
AssigneeSeagate Technology LLC
InventorsXueshi Yang, Erozan Kurtas
Life of this patent
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Abstract
A system for pattern dependent equalization has an equalizer bank and a detector. The equalizer bank has a plurality of equalizers, which are each tuned to a selected data pattern. The detector may be a standard sequence detector or a modified Viterbi detector, which calculates the branch metric using a pattern dependent equalized output and a pattern-dependent target. A method of decoding data uses a pattern dependent equalizer bank. The pattern dependent equalizer bank processes a segment of a bit sequence to produce an equalized pattern-dependent output for each equalizer in parallel. The detector then detects the bit sequence using the branch metric calculation to select the smallest accumulated path metric.
Claims8
A method of decoding data comprising:
- tuning each equalizer of a bank of equalizers to a bit pattern, wherein tuning each equalizer includes selecting an equalizer from the bank of equalizers, sending known data to the selected equalizer, calculating a difference between an output signal from the selected equalizer and a target output signal, and tuning the selected equalizer to reduce the difference;
- processing a segment of a received signal in a bank of equalizers, each equalizer tuned to a different bit pattern and an equalization target to produce an equalized output for each equalizer;
- and
- detecting a bit sequence using a branch metric calculation to process the equalized output.
Dependencies are inferred from the claim text.