Presentation 2019-06-14
A study on neural network LLR modulation in TDMR
Madoka Nishikawa, Yasuaki Nakamura, Yasushi Kanai, Hisashi Osawa, Yoshihiro Okamoto,
PDF Download Page PDF download Page Link
Abstract(in Japanese) (See Japanese page)
Abstract(in English) In our previous research, we focused on a log-likelihood ratio (LLR) computed as the decoding reliability by a posteriori probability (APP) decoder on the low-density parity-check (LDPC) coding and iterative decoding system by a signal processing for the shingled magnetic recording (SMR) in two-dimensional magnetic recording (TDMR), and the proposed LLR modulator using neural network realizes effective iterative decoding in a read/write channel. In this report, we clarify that the performance improvement of iterative decoding can be obtained by considering LLRs of the adjacent track bits affecting to the decoding bit as the input of the neural network. Furthermore, we clarify that hybrid genetic algorithm (HGA) operations select LLRs by using the adjacent track LLRs affecting to the decoding bit and can update the connection weights of neural network for effective iterative decoding.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) SMR / TDMR / LDPC / LLR / Neural network
Paper # MRIS2019-8
Date of Issue 2019-06-06 (MRIS)

Conference Information
Committee MRIS / ITE-MMS
Conference Date 2019/6/13(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Tohoku Univ.
Topics (in Japanese) (See Japanese page)
Topics (in English) Recording Systems, etc.
Chair Satoshi Matsunuma(Maxell) / Akihiko Ishii(NHK)
Vice Chair
Secretary (Toshiba) / (Kinki Univ.)
Assistant Ikuya Tagawa(Tohoku Inst. of Tech.) / Hiroko Arai(AIST)

Paper Information
Registration To Technical Committee on Magnetic Recording & Information Storage / Technical Group on Multi-media Storage
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) A study on neural network LLR modulation in TDMR
Sub Title (in English)
Keyword(1) SMR
Keyword(2) TDMR
Keyword(3) LDPC
Keyword(4) LLR
Keyword(5) Neural network
1st Author's Name Madoka Nishikawa
1st Author's Affiliation Ehime University(Ehime Univ.)
2nd Author's Name Yasuaki Nakamura
2nd Author's Affiliation Ehime University(Ehime Univ.)
3rd Author's Name Yasushi Kanai
3rd Author's Affiliation Niigata Institute of Technology(NIT)
4th Author's Name Hisashi Osawa
4th Author's Affiliation Ehime University(Ehime Univ.)
5th Author's Name Yoshihiro Okamoto
5th Author's Affiliation Ehime University(Ehime Univ.)
Date 2019-06-14
Paper # MRIS2019-8
Volume (vol) vol.119
Number (no) MRIS-79
Page pp.pp.53-58(MRIS),
#Pages 6
Date of Issue 2019-06-06 (MRIS)