Disk drive margining read channel by biasing log-likelihood ratios of a nonbinary iterative decoder
US8339919B1 · kind B1 · utility
71Cited by
6References
14Claims
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Key dates
| Filing date | Dec 14, 2011 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Dec 14, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2508
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk and control circuitry operable to sample a read signal emanating from the head to generate read samples. First vectors of log-likelihood ratios (LLRs) are generated in response to the read samples, wherein each vector corresponds to a nonbinary symbol q in a set of symbols. The first vectors of LLRs are biased to generate biased vectors of LLRs, and the biased vectors of LLRs are decoded into a data sequence, wherein the biased vectors of LLRs increase an error rate of the data sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.