PRML process of multilevel run-length-limited modulation recording on optical disc

Jiang, Sun-How; Lo, Feng-Hsiang

doi:10.1109/tmag.2004.842015

Cited by 21 publications

(13 citation statements)

References 2 publications

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“…The RF signals in optical recording can be expressed as a convolution of the ideal multi-level modulation (MLM) input sequence waveform with an impulse response. 3) The impulse response IðtÞ can be expressed as…”

Section: Snr Requirementsmentioning

confidence: 99%

“…Recording of 3L-RLL modulation has been implemented on phase-change materials and the relevant signal process methods are also discussed. [2][3][4] The read-only disc, which is mainly used in publication, is the most important member in optical disc family, therefore, we are much interested in employing ML-RLL technology on read-only disc so as to increase its capacity and transfer rate. In this paper, the implementation of ML-RLL recording on the read-only disc is proposed, and four level ð2; 10Þ constrained RLL [ð2; 10Þ 4L-RLL] recording is discussed.…”

Section: Introductionmentioning

confidence: 99%

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Multilevel Run-Length Limited Recording on Read-Only Disc

Zhang

et al. 2006

jjap

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We use the holographic AdS/QCD soft-wall model to investigate the spectrum of scalar glueballs in a finite temperature plasma. In this model, glueballs are described by a massless scalar field in an AdS 5 black hole with a dilaton soft-wall background. Using AdS/CFT prescriptions, we compute the boundary retarded Green's function. The corresponding thermal spectral function shows quasiparticle peaks at low temperatures. We also compute the quasinormal modes of the scalar field in the soft-wall black hole geometry. The temperature and momentum dependences of these modes are analyzed. The positions and widths of the peaks of the spectral function are related to the frequencies of the quasinormal modes. Our numerical results are found employing the power series method and the computation of Breit-Wigner resonances.

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Section: Snr Requirementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multilevel Run-Length Limited Recording on Read-Only Disc

Zhang

et al. 2006

jjap

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“…For these reasons, researchers tried to use PRML technology to compensate the lost SNR and to handle the ISI effect. 6,7) In a sense, M-ary ðd; kÞRLL achieves a good tradeoff between SNR and recording density, since the reduction of SNR in a multi-level system is rewarded by the increase in recording density. 2.1 Four-ary ð2; 8ÞRLL code By extending the Immink's code design method, 9) we construct a new 93.25% efficient four-ary ð2; 8ÞRLL code, which is shown in Table II.…”

Section: Modulation Codementioning

confidence: 99%

“…Based on the readout RF signals from a four-level ROM disc, a channel model of the four-level recording channel is established in §3. Like three-level recording, 6) we also adopt partial-response maximum-likelihood (PRML) technology to recover the data from the simulated readout four-level RF signals, and the results are shown and discussed in §4. Finally, §5 provides a summary of this paper.…”

Section: Introductionmentioning

confidence: 99%

DC-Free Four-Ary (2,8) Run-Length Limited Code for Multi-level Recording Channels

Hu¹,

Pei²,

Xiong³

et al. 2006

Jpn. J. Appl. Phys.

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A new high efficient DC-free (2,8) run-length limited (RLL) code for four-level optical recording channels is proposed. The proposed code can be represented by a finite state diagram (FSM) with three states and implemented easily. The code rate and density ratio of the code are 5/6 bits/symbols and 2.50 bits/minimum-recorded-mark, respectively. On the basis of the experimental results, the performances of the code are evaluated by using partial-response maximum-likelihood (PRML) technology, which is suitable for detecting multi-level RLL signals. By using four-ary (2,8)RLL modulation and PRML technology, one can increase the recording density 66.7% relative to conventional binary RLL modulation currently used in digital versatile disc (DVD), meanwhile the bit error rate (BER) still be acceptable.

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“…A PRML detector may be used to solve this problem. 14) General PR modes used in optical recording channels are Viterbi algorithm is adopted for the maximum likelihood sequential estimation (MLSE) of the PR equalized channel. Figure 2 shows the Viterbi detector trellis…”

Section: Characteristics Of M ¼ 4 Rll ð2; 12þ Codementioning

confidence: 99%

A New Four-Ary Run-Length-Limited (2,12) Code for Multilevel Optical Recording Channels

Pan

et al. 2005

Jpn. J. Appl. Phys.

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In this paper, we introduce a new four-ary run-length-limited (d,k)=(2,12) code for multilevel optical recording channels. This code has a simple one-codeword look-ahead encoder and a sliding block decoder. The code rate is 4/5 (bits/symbol), and the density ratio is 2.4 bits/T min, which is larger than that of binary codes used for typical optical recording systems. The encoding and decoding rules of the proposed code are simple and easy for implementation. With the bit error rate (BER) performance evaluation, this code shows feasible to be applied in high-density multilevel optical storage systems.

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PRML process of multilevel run-length-limited modulation recording on optical disc

Cited by 21 publications

References 2 publications

Multilevel Run-Length Limited Recording on Read-Only Disc

Multilevel Run-Length Limited Recording on Read-Only Disc

DC-Free Four-Ary (2,8) Run-Length Limited Code for Multi-level Recording Channels

A New Four-Ary Run-Length-Limited (2,12) Code for Multilevel Optical Recording Channels

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