Non-linear LLR look-up tables
AssigneeSeagate Technology LLC
InventorsDeepak Sridhara, Rishi Ahuja, William M. Radich, Ara Patapoutian
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Abstract
In one implementation, the disclosure provides a system including a detector configured to generate an output of a first log-likelihood ratio for each bit in an input data stream. The system also includes at least one look-up table providing a mapping of the first log-likelihood ratio to a second log-likelihood ratio. The mapping between the first log-likelihood ratio and the second log-likelihood ratio is non-linear. The system also includes a decoder configured to generate an output data stream using the second log-likelihood ratio to generate a value for each bit in the input data stream.
Claims20
A system comprising:
- a detector configured to generate an output of a first log-likelihood ratio for each bit in an input data stream read from a storage medium;
- a first look-up table providing a mapping of the first log-likelihood ratio to a second log-likelihood ratio, the mapping between the first log-likelihood ratio and the second log-likelihood ratio being non-linear, the first look-up table being selected based on a density parameter of the storage medium;
- and
- a decoder configured to generate an output data stream using the second log-likelihood ratio to generate a value for each bit in the input data stream.
A method comprising:
- generating a first log-likelihood ratio for each bit in an input data stream read from a storage medium;
- selecting at least one look-up table based on a density parameter of the storage medium;
- mapping the first log-likelihood ratio to a second log-likelihood ratio using at least one look-up table, the mapping between the first log-likelihood ratio and the second-log likelihood ratio being non-linear;
- and
- generating an output data stream using the second log-likelihood ratio to generate a value for each bit in the input data stream.
A method comprising:
- reading an input data stream from a storage medium;
- obtaining information about a density parameter of the storage medium;
- generating a first log-likelihood ratio for each bit in the input data stream;
- selecting at least one look-up table based on the parameter of the storage medium, the look-up table providing a mapping of the first log-likelihood ratio to a second log-likelihood ratio, the mapping between the first log-likelihood ratio and the second log-likelihood ratio being non-linear;
- and
- generating an output data stream using the second log-likelihood ratio to generate a value for each bit in the input data stream.
Dependencies are inferred from the claim text.