Soft-Output Decoding Approach of 2D Modulation Codes in Bit-Patterned Media Recording Systems

Chanon WARISARN; Piya KOVINTAVEWAT

doi:10.1587/transele.E98.C.1187

Soft-Output Decoding Approach of 2D Modulation Codes in Bit-Patterned Media Recording Systems

Chanon WARISARN, Piya KOVINTAVEWAT

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The two-dimensional (2D) interference is one of the major impairments in bit-patterned media recording (BPMR) systems due to small bit and track pitches, especially at high recording densities. To alleviate this problem, we introduced a rate-4/5 constructive inter-track interference (CITI) coding scheme to prevent the destructive data patterns to be written onto a magnetic medium for an uncoded BPMR system, i.e., without error-correction codes. Because the CITI code produces only the hard decision, it cannot be employed in a coded BPMR system that uses a low-density parity-check (LDPC) code. To utilize it in an iterative decoding scheme, we propose a soft CITI coding scheme based on the log-likelihood ratio algebra implementation in Boolean logic mappings in order that the soft CITI coding scheme together with a modified 2D soft-output Viterbi algorithm (SOVA) detector and a LDPC decoder will jointly perform iterative decoding. Simulation results show that the proposed scheme provides a significant performance improvement, in particular when an areal density (AD) is high and/or the position jitter is large. Specifically, at a bit-error rate of 10^-4 and no position jitter, the proposed system can provide approximately 1.8 and 3.5 dB gain over the conventional coded system without using the CITI code at the ADs of 2.5 and 3.0 Tera-bit per square inch (Tb/in²), respectively.

Publication: IEICE TRANSACTIONS on Electronics Vol.E98-C No.12 pp.1187-1192

Publication Date: 2015/12/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E98.C.1187

Type of Manuscript: PAPER

Category: Storage Technology

Authors

Chanon WARISARN
King Mongkut's Institute of Technology Ladkrabang
Piya KOVINTAVEWAT
Nakhon Pathom Rajabhat University

Keyword

bit-patterned media recording, log-likelihood ratio, modulation code, two-dimensional interference

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Chanon WARISARN, Piya KOVINTAVEWAT, "Soft-Output Decoding Approach of 2D Modulation Codes in Bit-Patterned Media Recording Systems" in IEICE TRANSACTIONS on Electronics, vol. E98-C, no. 12, pp. 1187-1192, December 2015, doi: 10.1587/transele.E98.C.1187.
Abstract: The two-dimensional (2D) interference is one of the major impairments in bit-patterned media recording (BPMR) systems due to small bit and track pitches, especially at high recording densities. To alleviate this problem, we introduced a rate-4/5 constructive inter-track interference (CITI) coding scheme to prevent the destructive data patterns to be written onto a magnetic medium for an uncoded BPMR system, i.e., without error-correction codes. Because the CITI code produces only the hard decision, it cannot be employed in a coded BPMR system that uses a low-density parity-check (LDPC) code. To utilize it in an iterative decoding scheme, we propose a soft CITI coding scheme based on the log-likelihood ratio algebra implementation in Boolean logic mappings in order that the soft CITI coding scheme together with a modified 2D soft-output Viterbi algorithm (SOVA) detector and a LDPC decoder will jointly perform iterative decoding. Simulation results show that the proposed scheme provides a significant performance improvement, in particular when an areal density (AD) is high and/or the position jitter is large. Specifically, at a bit-error rate of 10^-4 and no position jitter, the proposed system can provide approximately 1.8 and 3.5 dB gain over the conventional coded system without using the CITI code at the ADs of 2.5 and 3.0 Tera-bit per square inch (Tb/in²), respectively.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E98.C.1187/_p

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@ARTICLE{e98-c_12_1187,
author={Chanon WARISARN, Piya KOVINTAVEWAT, },
journal={IEICE TRANSACTIONS on Electronics},
title={Soft-Output Decoding Approach of 2D Modulation Codes in Bit-Patterned Media Recording Systems},
year={2015},
volume={E98-C},
number={12},
pages={1187-1192},
abstract={The two-dimensional (2D) interference is one of the major impairments in bit-patterned media recording (BPMR) systems due to small bit and track pitches, especially at high recording densities. To alleviate this problem, we introduced a rate-4/5 constructive inter-track interference (CITI) coding scheme to prevent the destructive data patterns to be written onto a magnetic medium for an uncoded BPMR system, i.e., without error-correction codes. Because the CITI code produces only the hard decision, it cannot be employed in a coded BPMR system that uses a low-density parity-check (LDPC) code. To utilize it in an iterative decoding scheme, we propose a soft CITI coding scheme based on the log-likelihood ratio algebra implementation in Boolean logic mappings in order that the soft CITI coding scheme together with a modified 2D soft-output Viterbi algorithm (SOVA) detector and a LDPC decoder will jointly perform iterative decoding. Simulation results show that the proposed scheme provides a significant performance improvement, in particular when an areal density (AD) is high and/or the position jitter is large. Specifically, at a bit-error rate of 10^-4 and no position jitter, the proposed system can provide approximately 1.8 and 3.5 dB gain over the conventional coded system without using the CITI code at the ADs of 2.5 and 3.0 Tera-bit per square inch (Tb/in²), respectively.},
keywords={},
doi={10.1587/transele.E98.C.1187},
ISSN={1745-1353},
month={December},}

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TY - JOUR
TI - Soft-Output Decoding Approach of 2D Modulation Codes in Bit-Patterned Media Recording Systems
T2 - IEICE TRANSACTIONS on Electronics
SP - 1187
EP - 1192
AU - Chanon WARISARN
AU - Piya KOVINTAVEWAT
PY - 2015
DO - 10.1587/transele.E98.C.1187
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E98-C
IS - 12
JA - IEICE TRANSACTIONS on Electronics
Y1 - December 2015
AB - The two-dimensional (2D) interference is one of the major impairments in bit-patterned media recording (BPMR) systems due to small bit and track pitches, especially at high recording densities. To alleviate this problem, we introduced a rate-4/5 constructive inter-track interference (CITI) coding scheme to prevent the destructive data patterns to be written onto a magnetic medium for an uncoded BPMR system, i.e., without error-correction codes. Because the CITI code produces only the hard decision, it cannot be employed in a coded BPMR system that uses a low-density parity-check (LDPC) code. To utilize it in an iterative decoding scheme, we propose a soft CITI coding scheme based on the log-likelihood ratio algebra implementation in Boolean logic mappings in order that the soft CITI coding scheme together with a modified 2D soft-output Viterbi algorithm (SOVA) detector and a LDPC decoder will jointly perform iterative decoding. Simulation results show that the proposed scheme provides a significant performance improvement, in particular when an areal density (AD) is high and/or the position jitter is large. Specifically, at a bit-error rate of 10^-4 and no position jitter, the proposed system can provide approximately 1.8 and 3.5 dB gain over the conventional coded system without using the CITI code at the ADs of 2.5 and 3.0 Tera-bit per square inch (Tb/in²), respectively.
ER -