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modulation code and Multilayer Perceptron Decoding for Bit-Patterned Media Recording

IEEE MAGNETICS LETTERS 2020年 11卷 1页

作者： Jeong, Seongkwon Lee, Jaejin Soongsil Univ Sch Elect Engn Seoul 06978 South Korea

In a bit-patterned media recording (BPMR) system, reducing the spacing between adjacent bit islands in the down- and cross-track directions increases areal density;however, two-dimensional (2-D) interference comprising intersymbol and intertrack interferences degrades the system performance. To mitigate error patterns that increase the 2-D interference in BPMRs, 2-D modulation coding schemes have been proposed. In this letter, we present a modulation code and its decoding using a multilayer perceptron (MLP) for BPMRs. modulation decoding using an MLP can achieve significantly better performance than that using the minimum Euclidean distance, which is generally used to decode received modulated data. Similarly, when comparing the system performance at the same user density, modulation decoding using an MLP at 3 Tb/in(2) shows better performance than an uncoded system (partial response maximum-likelihood detector) at 2 Tb/in(2).

关键词： modulation Maximum likelihood decoding Interference Signal to noise ratio Tunneling magnetoresistance Media Information storage bit-patterned media recording decoding modulation code multilayer perceptron

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A Rate-8/9 2-D modulation code for Bit-Patterned Media Recording

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IEEE TRANSACTIONS ON MAGNETICS 2014年第11期50卷 1-4页

作者： Kovintavewat, Piya Arrayangkool, Auttasith Warisarn, Chanon Nakhon Pathom Rajabhat Univ Data Storage Technol Res Ctr Nakhon Pathom 73000 Thailand King Mongkuts Inst Technol Ladkrabang Coll Data Storage Innovat Bangkok 10520 Thailand

The 2-D interference consisting of intersymbol and intertrack interferences is a major impairment in bit-patterned media recording (BPMR), especially at high-areal density (AD). One solution to mitigate the effect of 2-D interference is to apply a 2-D coding scheme on an input data sequence before recording so as to avoid some data patterns that easily cause an error at the data detection process. Nonetheless, this method usually requires many redundant bits, thus lowering a code rate. This paper proposes a rate-8/9 modulation code for a multitrack multihead BPMR system to eliminate the data patterns that lead to severe 2-D interference. Simulation results indicate that the system with the proposed code is superior to that without coding, especially when the AD is high and/or the position jitter is large. Specifically, for the system without position jitter at bit-error rate of 10(-5), the proposed system can provide 1.8 dB gain over the system without coding at the AD of 2.5 Tb/in(2).

关键词： 2-D interference bit-patterned media recording (BPMR) modulation code position jitter

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An ITI-Mitigating 5/6 modulation code for Bit-Patterned Media Recording

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IEICE TRANSACTIONS ON ELECTRONICS 2015年第6期E98C卷 528-533页

作者： Warisarn, Chanon Arrayangkool, Autthasith Kovintavewat, Piya King Mongkuts Inst Technol Ladkrabang Coll Data Storage Innovat D STAR Bangkok 10520 Thailand Nakhon Pathom Rajabhat Univ Data Storage Technol Res Ctr Nakhon Pathom 73000 Thailand

In bit-patterned media recording (BPMR), the readback signal is severely corrupted by the inter-symbol interference (ISI) and inter-track interference (ITI), especially at high recording densities, due to small bit and track pitches. One way to alleviate the ITI effect is to encode an input data sequence before recording, so as to avoid some data patterns that easily cause an error at the data detection process. This paper proposes an ITI-mitigating 5/6 modulation code for a multi-track multi-head BPMR system to eliminate the data patterns that lead to severe ITI. Specifically, each of the 5 user bits is converted into a 6-bit codeword in the form of a 3-by-2 data array, based on a look-up table. Experimental results indicate that the system with the proposed coding scheme outperforms that without coding, especially when an areal density is high and/or the position jitter is large.

关键词： Bit-patterned media recording (BPMR) Euclidean distance Inter-track interference (ITI) modulation code

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Digital holographic memory using two-dimensional modulation code

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2001年第3B期40卷 1732-1736页

作者： Kume, T Yagi, S Imai, T Yamamoto, M NTT Cyber Space Labs Tokyo 1808585 Japan NTT Photon Labs Tokai Ibaraki 3191106 Japan

The degradation of reconstructed images from a digital holographic memory that uses highly sensitive strontium barium niobate as a recording medium was reduced using two-dimensional modulation codes that have low average intensity and high coding efficiency. The signal-to-noise ratios of the reconstructed images and hence the bit error rates of the data retrieved from the images were improved without reducing the coding efficiency.

关键词： digital holographic memory modulation code SBN signal-to-noise ratio bit error rate coding efficiency

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A new efficient error correctible modulation code for holographic data storage

A new efficient error correctible modulation code for hologr...

引用

International Symposium on Optical Memory (ISOM2001)

作者： Hwang, E Kim, K Kim, J Park, J Jung, H DAEWOO Elect Co Ltd Digital Media Lab KunPo 435733 KyongGi South Korea

A new efficient modulation code for holographic memory. or 9 : 12 pseudo-balanced code(9-12PBC), has been developed and evaluated. The proposed code is partitioned into 16 codeword subsets and is decoded in conjunction with Viterbi algorithm. The results of numerical simulations and actual recording experiments show that 9-12PBC gives favorable trade-off between code rate and bit error rate(BER) performance.

关键词： holographic data storage holographic memory channel code modulation code Viterbi algorithm correlation decoding

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A modulation code-based blind receiver for memoryless multiuser Volterra channels

A Modulation Code-based blind receiver for memoryless multiu...

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41st Asilomar Conference on Signals, Systems and Computers

作者： Fernandes, Carlos Alexandre R. Favier, Gerard Mota, Joao C. M. UNSA CNRS I3S Lab 2000 Route LuciolesBP 121 F-06903 Sophia Antipolis France Univ Fed Ceara DETI BR-755640 Fortaleza Ceara Brazil

ISBN: (纸本)9781424421091

This paper proposes a blind receiver for memoryless multiuser Volterra communication channels based on the use of modulation codes (constrained codes) and Second Order Statistics of the received signals. modulation codes allow to model the transmitted signals as Markov chains that are used to introduce temporal correlation and to ensure the orthogonality of transmitted signal products for several time delays, inducing a Parallel Factor (PARAFAC) decomposition of a tensor composed with spatio-temporal covariance matrices.

关键词： multiuser Volterra channel modulation code Markov chain Second Order Statistics PARAFAC decomposition

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Two-dimensional modulation code for multilayered waveguide holographic memory

Two-dimensional modulation code for multilayered waveguide h...

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International Symposium on Optical Memory (ISOM2001)

作者： Endo, M Kurokawa, Y Ueno, M Tanabe, T Yamamoto, M NTT Corp NTT Cyber Space Labs Musashino Tokyo 1808585 Japan

Our two-dimensional modulation code improves the decoding accuracy of images reconstructed from a multilayered waveguide holographic memory that have been translated, rotated, and distorted with respect to the image detector, The reconstructed images can be decoded without using a precision mechanical structure or an imaging mechanism that matches pixels of the reconstructed images to the pixel grid of the image detector. This code also improves the bit error rate of distorted reconstructed images and reduces crosstalk among different layers and image detector saturation.

关键词： multilayered waveguide holographic memory modulation code pixel-matching signal-to-noise ratio bit error rate

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Exploiting modulation code redundancy

Exploiting modulation code redundancy

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1997 Optical Data Storage Topical Meeting

作者： Hogan, J Hewlett-Packard Co. (United States)

Redundancy in modulation coding schemes for optical storage can be exploited for copy protection purposes. Two examples are given. One is a method of storing encryption key data iii a manner that will not be transferr... 详细信息

ISBN: (纸本)0819425303

关键词： copy protection modulation code channel coding redundancy optical storage

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Performance evaluation of Gray-mapped constant weight modulation code on a two-dimensional ISI/AWGN channel 6

Performance evaluation of Gray-mapped constant weight modula...

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6th International Conference on Signal Processing

作者： Chen, DR Xie, CS Pei, XD Huazhong Univ Sci & Technol Dept Comp Sci & Technol Wuhan 430074 Peoples R China

ISBN: (纸本)0780374886

A new encoding method of modulation code for page-oriented optical memories (POM's) based on Gray-code is introduced. The Gray-mapped constant weight modulation code (GCWMC) is evaluated by use of simulated POM data pages. It is illustrated that in tile statistical sense the proposed GCWMC has an advantage of bit-error ratio (BER) - performance over the binary-mapped constant weight modulation code (BCWMC) oil a severe two-dimensional inter-symbol interference (ISI) channel with additive white Gaussian noise (AWGN).

关键词： holographic storage Gray code constant weight code modulation code ISI

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Research on modulation code of multilayer disc

Research on modulation code of multilayer disc

引用

Conference on Advanced Optical Storage Technology

作者： Zhao, H Xu, DY Yue, HD Tsing Hua Univ Dept Precis Instrument & Mech Beijing 100084 Peoples R China

ISBN: (纸本)0819447196

Basing on the structure of multi-layer parallel-accessed disc, current modulation code is optimized to achieve higher density storage. Two problems, which may be serious after the optimization, are discussed: acceptable jitter and synchronization process of PLL. A novel method for procuring combined signal of channel bit clock for multi-layer disc is proposed, which satisfies the requirements of PLL. The novel method is at last proved by probabilistic theory. At the end of this paper, parameters of RLL for multi-layer disc are presented: d=4, k=10similar to15. These new parameters improve the track-density by 15%similar to20%.

关键词： multilayer disc modulation code RLL PLL jitter

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