On coding and decoding for high-order partial response systems

High-data-rate signal processing for hard disk drives is discussed. A recording channel is equalized as a partial response (PR) (1+D)(1-D/sup 3/), where D is a delay operator. Furthermore, 1/(1+D) pre-coding scheme is used, and the resulting response is given as (1-D/sup 3/), which achieves three-bi...

Full description

Saved in:
Bibliographic Details
Published inIEEE transactions on magnetics Vol. 34; no. 1; pp. 80 - 84
Main Author Umemoto, M.
Format Journal Article
LanguageEnglish
Published IEEE 01.01.1998
Subjects
Decoding
Delay
Detectors
Disk recording
Error correction codes
Hard disks
Interleaved codes
Signal processing
Signal to noise ratio
Viterbi algorithm
Online AccessGet full text

Cover

More Information
Summary:High-data-rate signal processing for hard disk drives is discussed. A recording channel is equalized as a partial response (PR) (1+D)(1-D/sup 3/), where D is a delay operator. Furthermore, 1/(1+D) pre-coding scheme is used, and the resulting response is given as (1-D/sup 3/), which achieves three-bit interleaving. The working speed of each Viterbi detector in interleaving PR channels is reduced to one third of the original bit-frequency. The performance of the reduced two-state Viterbi detector in the interleaving PR channel is compared with the conventional two-state Viterbi detector of the PR4 system. As a result, the proposed system improves the signal-to-noise ratio by about 3.0 db compared with the baseline PR4 maximum system. Finally, it is shown that the Error Coding (ECC) scheme for the interleaving needs a reversed hierarchy of ECC and channel coding.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9464
1941-0069
DOI:10.1109/20.663453