Measure to evaluate readout signal quality for the system using PRML

Kashihara, Yutaka

doi:10.1117/12.557136

Cited by 4 publications

(2 citation statements)

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“…Several methods for evaluating the quality of readout signals to estimate the bit error rate in a readout system with a PRML channel have been reported. [4][5][6][7][8][9] Since readout data is determined by mark edge positions, they should be detected and controlled precisely for writing. An index called ''edge-shift'' is often used to detect mark edge positions.…”

Section: Introductionmentioning

confidence: 99%

New Edge-Shift Detection Method for Write Strategy Optimization in High-Density Optical Disc Recording

Kurokawa

Minemura

Kikukawa

et al. 2011

Jpn. J. Appl. Phys.

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We propose a sophisticated edge-shift detection method based on the partial response maximum likelihood technology for high-density optical disc recordings. One of the major features is the capability of detecting the edge shifts of short marks that cannot be optically resolved. Another feature is that measured values are not affected by the signal-to-noise ratio in a readout signal. This ensures drive compatibility. Furthermore, the edge-shift values are sorted and evaluated corresponding to the write pulse control parameters for simplifying write strategy optimization. These features make write strategy optimization possible under an areal recording density of over 30 Gbyte/layer.

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Section: Introductionmentioning

confidence: 99%

New Edge-Shift Detection Method for Write Strategy Optimization in High-Density Optical Disc Recording

Kurokawa

Minemura

Kikukawa

et al. 2011

Jpn. J. Appl. Phys.

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“…For high-density optical disc systems, some new signal quality evaluation methods, based on the variance value of the path metric in the partial-response-maximum-likelihood (PRML) detection system, have been proposed for the purpose of replacing conventional data-to-clock jitter methods. [1][2][3][4] In the PRML detector (i.e., Viterbi detector), two branch paths are compared and the more likely one at each state and at each time is selected to find the maximumlikelihood path. Therefore, the variance value of differences in path metric between the maximum-likelihood path (MLpath) and second most likely path (second-path) is expected to have a good correlation with bit error rate (bER) in the PRML system.…”

Section: Introductionmentioning

confidence: 99%

Signal Quality Evaluation Method for Over-30-GB Blu-ray Discs

Shiraishi¹,

Ide²,

Ohkubo³

2006

jjap

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We proposed a new signal quality evaluation method applying a sequenced amplitude margin (SAM) for over 30-GB Blu-ray discs (BDs), where the dominant error pattern differs from lower-density discs (23 -27-GB BDs), and conventional signal quality evaluation method such as maximum-likelihood sequence error (MLSE) lose accuracy. We experimentally confirmed the effectiveness of our new method for 30 -31.5-GB BDs.

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