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Research on Ultrahigh-Density Perpendicular Magnetic Recording Using Adaptive PRML Systems

Research Project

Project/Area Number 17360182
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Communication/Network engineering
Research InstitutionEhime University

Principal Investigator

OSAWA Hisashi  Ehime University, Graduate School of Science and Engineering, Professor, 理工学研究科, 教授 (50029336)

Co-Investigator(Kenkyū-buntansha) OKAMOTO Yoshihiro  Ehime University, Graduate School of Science and Engineering, Associate Professor, 理工学研究科, 助教授 (20224082)
NAKAMURA Yasuaki  Ehime University, Graduate School of Science and Engineering, Research Associate, 理工学研究科, 助手 (50380259)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2006: ¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2005: ¥10,800,000 (Direct Cost: ¥10,800,000)
Keywordsperpendicular magnetic recording / thermal decay / PRML system / GPRML system / PRML-AR system / neural network equalization / adaptive PRML system / 信号処理方式 / マイクロトラックモデル
Research Abstract

A thermal decay model based on the experimental data for three CoPtCr-SiO_2 perpendicular magnetic recording (PMR) media with thermal stability factors K_uV/kT of 94, 60 and 45 is obtained. The long-term BER performance of PRML, GPRML and GPRML-AR systems for the 128/130(0,16/8) RLL code is evaluated by computer simulation using the thermal decay model at a linear recording density of 1000 kBPI, which is difficult to evaluate experimentally.
It is clarified that, in all PRML systems at t_E = 10^8 seconds, there is no degradation in BER performance for the medium of K_uV/kT =94, while an order of magnitude or so degradation in BERs is found for the medium of K_uV/kT =60 and three orders of magnitude or so degradation in BERs can be seen for the medium of K_uV/kT =45. Nevertheless, GPR1ML system provides the SNR improvements of 0.4, 0.4 and 4.9 dB at BER=10^<-4> over PR1ML system for the media of K_uV/k_T =94, 60 and 45, respectively, and GPR1ML-AR system offers the improvements of 1.5, 1.8 and 6.6 dB at t_E=10^6 is seconds.
When a neural network is employed as a equalizer and the network is simplified and optimized by using a hybrid genetic algorithm which is the combination of a back propagation algorithm and a genetic algorithm, the performance degradation of PRML system is not found for K_uV/kT =60 and till t_E = 10^5. Therefore, this shows that the combination of neural network equalization and PRML system has the good adaptability for the thermal decay. Hereafter, the adaptive GPRML and PRML-AR systems using a neural network equalizer will be studied.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (18 results)

All 2007 2005

All Journal Article (18 results)

  • [Journal Article] BER performance of PRML system in perpendicular magnetic recording channel with thermal decay2007

    • Author(s)
      N.Shinohara, H.Osawa, Y.Okamoto, Y.Nakamura, A.Nakamoto, K.Miura, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43・6

      Pages: 2262-2264

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Iterative decoding using attenuated extrinsic information from sum-product decoder for PMR channel with patterned medium2007

    • Author(s)
      Y.Nakamura, M.Nishimura, Y.Okamoto, H.Osawa, H.Aoi, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43・6

      Pages: 2277-2279

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Performance evaluation of PRML system based on thermal decay model2007

    • Author(s)
      N.Shinohara, K.Takeuchi, H.Osawa, Y.Okamoto, Y.Nakamura, A.Nakamoto, K.Miura, H.Muraoka, Y.Nakamura
    • Journal Title

      IEICE Transaction on Electronics 90-C・8(to be appeared)

    • NAID

      110007538805

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] An application of neural network equalization to polytopic multiplexing holography and reduction of interpixel interference2007

    • Author(s)
      H.Osawa, N.Kawaue, Y.Okamoto, Y.Nakamura, H.Ochi, S.Marukawa
    • Journal Title

      IEICE Transaction on Electronics 90-C・8(to be appeared)

    • NAID

      110007538911

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] バースト情報を用いたLDPC符号化・繰り返し復号化方式の性能評価2007

    • Author(s)
      仲村泰明, 中下 伸, 岡本好弘, 大沢 寿, 村岡裕明, 中村慶久
    • Journal Title

      電子情報通信学会論文誌(C) J90-C・5

      Pages: 437-446

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] BER performance of PRML system in perpendicular magnetic recording channel with thermal decay2007

    • Author(s)
      N.Shinohara, H.Osawa, Y.Okamoto, Y.Nakamura, A.Nakamoto, K.Miura, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43,6

      Pages: 2262-2264

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Iterative decoding using attenuated extrinsic information from sum-product decoder for PMR channel with patterned medium2007

    • Author(s)
      Y.Nakamura, M.Nishimura, Y.Okamoto, H.Osawa, H.Aoi, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43,6

      Pages: 2277-2279

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Performance evaluation of PRML system based on thermal decay model2007

    • Author(s)
      N.Shinohara, K.Takeuchi, H.Osawa, Y.Okamoto, Y.Nakamura, A.Nakamoto, K.Miura, H.Muraoka, Y.Nakamura
    • Journal Title

      IEICE Transaction on Electronics E90-C

      Pages: 8-8

    • NAID

      110007538805

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] An application of neural network equalization to polytopic multiplexing holography and reduction of interpixel interference2007

    • Author(s)
      H.Osawa, N.Kawaue, Y.Okamoto, Y.Nakamura, H.Ochi, S.Marukawa
    • Journal Title

      IEICE Transaction on Electronics E90-C

      Pages: 8-8

    • NAID

      110007538911

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Performance evaluation of LDPC coding and Iterative decoding system using burst information2007

    • Author(s)
      Y.Nakamura, S.Nakashita, Y.Okamoto, H.Osawa, H.Muraoka, Y.Nakamura
    • Journal Title

      IEICE Transaction on Electronics J90-C, 5

      Pages: 437-446

    • NAID

      110007379885

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] BER performance of PRML system in perpendicular magnetic recording channel with thermal decay2007

    • Author(s)
      N.Shinohara, H.Osawa, Y.Okamoto, Y.Nakamura, A.Nakamoto, K.Miura, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43・6(to be appeared)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Iterative decoding using attenuated extrinsic information from sum-product decoder for PMR channel with patterned medium2007

    • Author(s)
      Y.Nakamura, M.Nishimura, Y.Okamoto, H.Osawa, H.Aoi, H.Muraoka, Y.Nakamura
    • Journal Title

      IEEE Transactions on Magnetics 43・6(to be appeared)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] An application of neural network equalization to polytopic multipexing holography and reduction of interpixel interference2007

    • Author(s)
      H.Osawa, N.Kawaue, Y.Okamoto, Y.Nakamura, H.Ochi, S.Marukawa
    • Journal Title

      IEICE Transaction on Electronics 90-C・8(to be appeared)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] バースト情報を用いたLDPC符号化・繰り返し復号化方式の性能評価2007

    • Author(s)
      仲村泰明, 中下 伸, 岡本好弘, 大沢 寿, 村岡裕明, 中村慶久
    • Journal Title

      電子情報通信学会論文誌(C) J90-C・5(掲載予定)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 垂直磁気記録のためのニューラルネットワーク等化器の簡単化2005

    • Author(s)
      大沢 寿
    • Journal Title

      電子情報通信学会論文誌(C) J88-C,4

      Pages: 270-277

    • Related Report
      2005 Annual Research Report
  • [Journal Article] PRML方式を適用した長手及び垂直磁気記録の性能比較2005

    • Author(s)
      岡本好弘
    • Journal Title

      日本応用磁気学会誌 29,4

      Pages: 432-435

    • NAID

      110002811813

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Performance comparison of post-processor for PRML channel in perpendicular magnetic recording2005

    • Author(s)
      Y.Nakamura
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 405-409

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Influence of overwrite noise on performance of PRML channels in perpendicular magnetic recording2005

    • Author(s)
      H.Isozaki
    • Journal Title

      Journal of Magnetism and Magnetic Materials 287

      Pages: 416-420

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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