PRML Detection of Multi-Level DVD Channels with Run-Length-Limited Modulation

Hu, Hua; Pan, Longfa

doi:10.1109/icc.2007.1033

Cited by 2 publications

(3 citation statements)

References 25 publications

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“…For the multilevel recording channel discussed in [15] and [37], they investigated that the PR model is closed to the actual ML-RLL DVD channel with transfer function (2) of the S = 4.6 channel. For theoretical experiments, the PR channel has impulse response h=(1,2,2,1) denoted as PR(1,2,2,1).…”

Section: B Channel Model For Magneto-optical Recording Channelmentioning

confidence: 99%

“…Over optical research in recent years, photochromic materials in [9] [10] [11] [12] have the characteristic of the absorption altering nonlinearly with the exposure energy is applicable for non-saturation multi-level recording and also allow four-level marks to be written on the disc. Multi-level DVD-ROM driver with conventional setup is studied in [13] and [14], which raises the intuition of studying over 4-level RLL modulation on DVD-ROM discs in [15]. However, it is critical to maintain higher quality of 4-level recording systems, which has raised great concern in [16] [17] [18] [19] [20] [21] [22] for combining RLL and error correcting code (ECC).…”

Section: Introductionmentioning

confidence: 99%

“…The symbol sequence z i after PAM signal mapping will be recorded on the disc by controlling the power of the writing laser. Multi-level DVD-ROM driver with conventional setup is studied in [13] and [14], which raise the intuition of studying over 4-level RLL modulation on DVD-ROM discs in [15]. However, it is critical to maintain higher quality of 4-level recording systems, which has raised great concern in [22] [16] [17] [18] [19] [20] [21] for combining RLL and error correcting code (ECC).…”

Section: Introductionmentioning

confidence: 99%

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Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Chou

Sham

2017

2017 International SoC Design Conference (ISOCC)

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For efficient modulation and error control coding, the deliberate flipping approach imposes the run-lengthlimited(RLL) constraint by bit error before recording. From the read side, a high coding rate limits the correcting capability of RLL bit error. In this paper, we study the low-density paritycheck (LDPC) coding for RLL constrained recording system based on the Unequal Error Protection (UEP) coding scheme design. The UEP capability of irregular LDPC codes is used for recovering flipped bits. We provide an allocation technique to limit the occurrence of flipped bits on the bit with robust correction capability. In addition, we consider the signal labeling design to decrease the number of nearest neighbors to enhance the robust bit. We also apply the density evolution technique to the proposed system for evaluating the code performances. In addition, we utilize the EXIT characteristic to reveal the decoding behavior of the recommended code distribution. Finally, the optimization approach for the best distribution is proven by differential evolution for the proposed system.

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Section: B Channel Model For Magneto-optical Recording Channelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Chou

Sham

2017

2017 International SoC Design Conference (ISOCC)

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Design and evaluation of a dual-beam read/write configuration for optical storage

Liu

et al. 2022

Journal of Applied Physics

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Increasing the number of read/write layers and ensuring the quality of read/write signals are the key factors to enhance the optical storage capacity. However, limited by the single optical path, the structure, and the material of the disk, the existing system reads and writes up to 16 layers. In the existing optical storage system design, the optical path design and the signal model are independent of each other, so the signal quality based on the signal model can only be evaluated after the implementation of the optical path. We propose a dual-beam read/write optical path for the optical storage system, which breaks through the limitation of the single optical path and can read/write multilayers. The servo detection signals and servo margins show that the dual-beam read/write system has good error detection capability and strong robustness. The servo error signal is calculated according to the relationship between the wavefront aberration, relative coordinate system displacement difference, and servo error of the optical system, thus deriving a quantifiable signal evaluation model. The effectiveness of the model is verified by experiments. The signal evaluation model breaks through the limitations of the traditional optical design method for the optical storage system and can guide the optical design from the signal perspective. The dual-beam optical path for multilayer optical storage systems provides a broader range of ideas for enhancing optical storage capacity.

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PRML Detection of Multi-Level DVD Channels with Run-Length-Limited Modulation

Cited by 2 publications

References 25 publications

Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Unequal protection approach for RLL-constrained LDPC coded recording system using deliberate flipping

Design and evaluation of a dual-beam read/write configuration for optical storage

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