System perspectives for the application of structured LDPC codes to data storage devices

We have three main goals in this paper. First, we will show the equivalences and relationships among some of the well-known classes of structured low density parity check (LDPC) codes. Second, we consider application of these codes to magnetic recording channel. We will make performance comparisons...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2006-02, Vol.42 (2), p.200-207
Main Authors: Kurtas, E.M., Kuznetsov, A.V., Djurdjevic, I.
Format: Article
Language:English
Subjects:
Bit error rate
Channels
Circuit synthesis
Codes
Concatenated codes
Cross-disciplinary physics: materials science
rheology
Data storage
Data storage read channel
Density
Devices
Equivalence
Exact sciences and technology
Failure rates
Geometry
Iterative decoding
LDPC codes
Low density parity check codes
Magnetic analysis
Magnetic recording
Magnetism
Materials science
Memory
Other topics in materials science
Parity check codes
Physics
Reed-Solomon codes
sector failure rate
Sparse matrices
Systems design
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Summary:We have three main goals in this paper. First, we will show the equivalences and relationships among some of the well-known classes of structured low density parity check (LDPC) codes. Second, we consider application of these codes to magnetic recording channel. We will make performance comparisons not only with bit-error-rate (BER) metric but also with sector failure rate (SFR) as the comparison dimension. Such a comparison is more meaningful from a system analysis perspective. Finally, we consider the case of these structured LDPC codes concatenated with conventional Reed-Solomon (RS) codes. We believe LDPC codes will not completely replace RS codes in the future storage devices. From this perspective, for LDPC codes to be contenders for future architectures, they will need to work in harmony with the outer RS codes. This implies that we have to take into account the redundancy introduced by the overall coding scheme, that is, RS code in concatenation with LDPC code, to reach meaningful comparisons from a system design perspective.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2005.861751