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Performance of run-length-limited (3,11) code for optical storage

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2001年第3B期40卷 1727-1728页

作者： Lee, J Kim, J Yong, S Lee, J Dongguk Univ Dept Elect Engn Seoul 100715 South Korea Daewoo Elect Co Ltd DIT Lab KunPo 435030 KyongGi Do South Korea

This paper introduces a run-length-limited (RLL) (3, 11) code and compares its performance with that of the EFMPlus code using four different detection methods including partial response maximum likelihood (PRML), fixed delay tree search with decision feedback (FDTS/DF), partial response with decision feedback equalizer (PR-DFE) and decision feedback equalizer (DFE). The advantages of the proposed code are: (1) the larger density ratio and (2) the simple encoder/decoder.

关键词： RLL code detection methods optical storage modulation code EFMPlus code

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Product coded modulation

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IEEE TRANSACTIONS ON COMMUNICATIONS 1997年第4期45卷 389-392页

作者： Rajpal, S Lin, S UNIV HAWAII MANOA DEPT ELECT ENGNHONOLULUHI 96822

This letter presents a technique of combining multilevel coded modulation and product coding to form product modulation codes which achieve low bit error rates with reduced decoding complexity, Three multistage decoding algorithms are presented, and good codes for both the additive white Gaussian noise (AWGN) and Rayleigh fading channels have been constructed.

关键词： .multistage columns Rayleigh fading channel decoding complexity modulation code squared Euclidean product modulation product codes

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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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Charge-constrained (0,G/I;C) sequences

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IEEE TRANSACTIONS ON COMMUNICATIONS 1997年第10期45卷 1183-1191页

作者： Lin, YY Liu, PH Laboratory of Chromatography DEPg.Fac.Quimica Universidad Nacional Autonoma de Mexico Circuito interior Cd Universitaria/CP 04510 Mexico D.F.Mexico

A (0, G/I) code is a modulation code used in the PRML recording system in which G and I represent the maximum number of zeros between two consecutive ones in the global sequence and the interleaved subsequences, respectively. For some magnetic recording systems such as the one with a helical scanning rotary head, a dc-balanced write waveform is required to meet channel requirements. In this study, charge-constrained (0, G/I;C) sequences which can generate a dc-balanced write waveform are investigated, where C represents the upper bound of charge. Based upon the runlength subgraphs and the transition matrices, capacities and power spectra of (0, G/I;C) sequences are derived and computed.

关键词： capacity modulation code partial-response maximum-likelihood recording runlength graph

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RUNLENGTH codeS FROM SOURCE codeS

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IEEE TRANSACTIONS ON INFORMATION THEORY 1991年第3期37卷 682-687页

作者： KERPEZ, KJ Bell Communications Research Inc. Morristown NJ USA

Binary runlength codes, also known as (d,k) codes, are used primarily for magnetic and optical recording. A class of (d,k) codes is analyzed. These codes are developed by constructing a lossless source code that maps runlengths into unconstrained binary sequences. The source code is constructed for the maxentropic distribution on runlengths. The inverse of the source code, which outputs runlengths guided toward the ideal maxentropic distribution, is the (d,k) code. Four types of source codes are investigated for this purpose: Huffman, enumerative, variable-length-to-block, and Elias or arithmetic. The rates of the codes are each proven to converge to the capacity with increasing complexity. The codes are not state dependent and are variable rate except for the fixed-rate enmerative code. A combined source-(d,k) code is presented that is based on the arithmetic code.

关键词： RUNLENGTH code (D,K) code ARITHMETIC code modulation code MAXIMUM ENTROPY MAXENTROPIC

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Combined Viterbi Detector for a Balanced code in Page Memories

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Wuhan University Journal of Natural Sciences 2004年第1期9卷 37-40页

作者： ChenDuan-rong XieChang-sheng1 PeiXian-deng SchoolofComputerScienceandTechnology HuazhongUniversityofScienceandTechnologyWuhan430074HubeiChina SchoolofMathematicsandComputerScience HubeiUniversityWuhan430062HubeiChina

Based on the two path metrics being equal at a merged node in the trellis employed to describe a Viterbi detector for the detection of data encoded with a rate 6:8 balanced binary code in page-oriented optical memories, the combined Viterbi detector scheme is proposed to improve raw biterror rate performance by mitigating the occurrence of a twobit reversing error event in an estimated codeword for the balanced code. The effectiveness of the detection scheme is verified for different data quantizations using Monte Carlo simulations. Key words holographic data storage - balanced code - modulation code - Viterbi algorithm - path metric CLC number TN 911. 21 Foundation item: Supported by National 973 Research Program of China (G1999033006) Biography: Chen Duan-rong (1960-), male, Lecturer, Ph. D candidate, research direction: coding and signal processing for the recording channel of holographic data storage.

关键词： holographic data storage balanced code modulation code Viterbi algorithm path metric

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A PRML with modified branches of a dual MTR code for high-density PMR channels

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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 2005年 287卷 410-415页

作者： Lee, J Lee, J Dongguk Univ Dept Elect Engn Chung Ku Seoul 100715 South Korea

Maximum transition run (MTR, j) code is a modulation code that limits the consecutive transitions. We present a dual MTR code that can be applicable to high-density perpendicular magnetic recording (PMR) channels. The code restricts j=2 in each codeword and allows j=3 when codewords are connected. Furthermore, to improve the detection performance of the PMR systems, we propose a partial response maximum likelihood (PRML) detection scheme with modified branches of the Viterbi trellis for the code. The PRML detection of the dual MTR code achieves an SNR gain of more than 2 and 0.3 dB over the conventional fourth-order PRML detections with rate 8/9 code and rate 6/7 MTR (j=2) code at 10(-5) bit error rate (BER) in the PM R channel model, respectively. (C) 2004 Elsevier B.V. All rights reserved.

关键词： modulation code MTR coding PRML Viterbi detector with modified branch metric

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Signal processing method of holographic memory using image distortion correction and soft decision Viterbi decoding method

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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS 2005年第5B期44卷 3508-3512页

作者： Sato, D Nishimoto, K Katayanagi, Y Yamamoto, M Tokyo Univ Sci Grad Sch Ind Sci & Technol Noda Chiba 2788510 Japan

The signal quality of holographic memory is greatly lowered by the pixel mismatch between the charge-coupled device (CCD) and the reproduced image caused by image distortion. This paper discusses an approach to improve the signal quality by using two step decoding method. By this method, first, distortion correction is done to improve the degree of pixel mismatch to obtain better signal to noise ratio (SNR). Then, to eliminate errors such as noise that cannot be removed by distortion correction, soft decision Viterbi decoding using the newly defined reliability is used to correct errors. The effectiveness of this two step decoding method was tested by computer simulation, and its effect to improve SNR and reduce errors was confirmed.

关键词： holographic memory distortion correction Viterbi decoding soft decision reliability modulation code

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Signal processing method of holographic memory using image distortion correction and soft decision Viterbi decoding method

Signal processing method of holographic memory using image d...

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14th International Symposium on Optical Memory

作者： Sato, D Nishimoto, K Katayanagi, Y Yamamoto, M Tokyo Univ Sci Grad Sch Ind Sci & Technol Noda Chiba 2788510 Japan