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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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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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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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A Fully Automatic Water Feature Extraction Method with Adaptive Training Samples and One-Class Classification Algorithms 6

A Fully Automatic Water Feature Extraction Method with Adapt...

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6th International Conference on Computing for Sustainable Global Development (INDIACom)

作者： Singh, Alok Kumar Singh, Lokesh Kumar Num AI Labs Private Ltd Lucknow Uttar Pradesh India Cent Bank India IT Dept Kanpur Uttar Pradesh India

ISBN: (纸本)9789380544342

Automatic water feature delineation from satellite imagery is a challenging task due to the variability of sensor parameters, acquisition conditions, and geographical heterogeneity of scenes. To mitigate above challenges, we proposed a fully automatic method for surface water feature dilatation from the moderate resolution satellite imagery through the integration of adaptive and automatic training sample collection by a modulated spectral reflectance curve and one-class classification algorithm. The specific modulation codes that are partially able to represent water features have been chosen to collect positive training samples for the target class. In addition, one-class classification algorithm has applied to classify multispectral imagery, and it utilized the collected datasets as the positive-labeled training samples for the target class. The novelty of the proposed approach is that it's applicable to several moderate resolution sensors having SWIR, NIR, Red, and Green spectral bands. We evaluated the robustness of the proposed method on different multispectral earth observation sensors (Landsat 8OLI, LISS-III IRS-P6, and Sentinel 2A MSI) having heterogeneous acquisition environments. We achieved the overall accuracy on test sites ranges from 93.90 % to 97.27 %, and kappa statistics is ranges from 0.7622 to 0.9453.

关键词： Automatic Extraction Adaptive Training Samples modulation code One-Class Classification

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Soft-Output Decoding Approach of 2D modulation codes in Bit-Patterned Media Recording Systems

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IEICE TRANSACTIONS ON ELECTRONICS 2015年第12期E98C卷 1187-1192页

作者： Warisarn, Chanon 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

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/in(2)), respectively.

关键词： bit-patterned media recording log-likelihood ratio modulation code two-dimensional interference

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Apple :: Lisa :: Applenet :: Applenet Hardware Background and Current Status

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2016年

Apple :: Lisa :: Applenet :: Applenet Hardware Background and Current Status by published by

关键词： apple applenet applenet hardware background bus bus arbitration connected current figure hardware harvard frequency host local network local networks modified harvard modulation code network networks node nodes physical controller physical level ring network status

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A Coding Scheme Using Redundant Bits for Bit Patterned Media Recording Channel without Overshoot

A Coding Scheme Using Redundant Bits for Bit Patterned Media...

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Annual Summit and Conference of Asia-Pacific-Signal-and-Information-Processing-Association (APSIPA)

作者： Arrayangkool, Autthasith King Mongkuts Inst Technol Ladkrabang Coll Data Storage Innovat Bangkok 10520 Thailand

ISBN: (纸本)9786163618238

In bit patterned magnetic recording (BPMR), The two-dimensional (2D) interference composed of inter-symbol and inter-track interference is a major problem especially at high areal density (AD). One way to alleviate the destructive effect of 2D interference is to deploy a 2D coding scheme on an input data sequence before recording in order to avoid some data patterns that easily cause an error at the data readback process. However, some coding schemes generate high complexity. Consequently, this paper proposes a new low-complexity modulation code with redundant bits to eliminate the data patterns leading to severe 2D interference and compare overall system performance. Experimental 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.

关键词： intersymbol interference jitter magnetic recording modulation coding 2D coding scheme 2D interference BPMR areal density bit patterned media recording channel data patterns data readback process data sequence intertrack interference modulation code position jitter Abstracts Bit error rate Encoding Interference Jitter Magnetic recording Signal to noise ratio

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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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A New Error Correction Technique for BD systems

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IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 2010年第2期56卷 663-668页

作者： Lee, Jun Lee, Seong-Hun Digital Storage Research Laboratory LG Electronics Korea

Two-dimensional error correction codes (2D-ECCs) have been the cornerstone of all three generations of optical recording-CD, DVD and BD. Research into powerful error correction methods is paramount for the development of high-capacity optical recording systems. A picket code for BD systems performs an error and erasure decoding by giving and taking erasure information between two ECCs. However, the method is possible to generate and utilize incorrect erasure information with non-ignorable probability by each ECC. This paper will present a new error correction strategy for BD systems that performs error and erasure decoding using the only erasure information supplied from a modulation code decoder more specifically, the 17 parity-preserving (PP) code for BD systems. We will evaluate the decoding efficiency of the new error correction technique under a channel model with various error types as well as real optical storage system

关键词： Error correction code Reed-Solomon code error and erasure decoding picket code modulation code 17PP code

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New Developments of the Signal Waveform modulation Optical Disc

New Developments of the Signal Waveform Modulation Optical D...

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Conference on Optical Data Storage

作者： Liu, Hailong Pei, Jing Pan, Longfa Ni, Yi Tsinghua Univ Dept Precis Instrument & Mech Opt Memory Natl Engn Res Ctr Beijing 100084 Peoples R China

ISBN: (纸本)9780819482198

This paper presents the new development of the signal waveform modulation optical disc. The signal waveform modulation optical disc is realized through inserting a sub-pit/sub-land into an original land/pit. More storage states are realized with changing the size and position of the sub-pits/sub-lands, which influence the corresponding readout signal waveforms. modulation code and its realization are key technologies for signal waveform modulation optical disc. In this study, we employ maximum run transition code and level modulation process as the modulation code of signal waveform modulation optical disc. A 5/6MTR (2, 10) code is designed as the first step of the proposed modulation code, and the level modulation process are used to avoid multilevel on shortest runs. The realization process of the proposed code is presented, and the maximum level numbers for different run-length marks are investigated with the calculated readout signals.

关键词： multilevel optical data storage modulation code readout signal

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