Refinements of Multi-Track Viterbi Bit-Detection

Hekstra, A.P.; Coene, W.; Immink, A.H.J.

doi:10.1109/tmag.2007.897665

Cited by 12 publications

(3 citation statements)

References 12 publications

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“…9) After equalization a sample rate converter (SRC) is present to obtain a bit-synchronous replay signal y k , at the input of the bit-detector. The bit-period corresponding to the lattice period on the disc is indicated by T. The bit-detector is a stripe-wise Viterbi detector 10) using local sequence feedback to reduce its state complexity and thereby its silicon implementation costs. The order of processing was chosen such that the feedback control loops with the highest bandwidth have the smallest loop delay.…”

Section: Software Receivermentioning

confidence: 99%

Two-Dimensional Optical Storage: High-Speed Read-Out of a 50 GByte Single-Layer Optical Disc with a 2D Format Using λ=405 nm and NA=0.85

Bruls¹,

Immink²,

Lee³

et al. 2005

Jpn. J. Appl. Phys.

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With ever increasing storage capacities, long read-out times of content are becoming a bottleneck for the convenient use of optical storage devices. Two-dimensional optical storage (TwoDOS) is a new concept that solves this data-rate problem through parallel read-out. Furthermore, an increase of at least a factor of 2 in storage capacity is achieved by exploiting a two-dimensional format. The advantages offered by TwoDOS are obtained without the need of changing the physics of the read-out system. Using Blu-ray Disc optics, single-layered 12 cm discs with capacities up to 50 GByte have been read out successfully. Signal level and error analysis show the feasibility of a further capacity increase. Also, bit-rates as high as 700 Mbit/s during read-out have been reached. All this is achieved by applying advanced signal processing and advanced disc mastering techniques and the proper design of the optical path.

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Section: Software Receivermentioning

confidence: 99%

Two-Dimensional Optical Storage: High-Speed Read-Out of a 50 GByte Single-Layer Optical Disc with a 2D Format Using λ=405 nm and NA=0.85

Bruls¹,

Immink²,

Lee³

et al. 2005

Jpn. J. Appl. Phys.

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“…Similar work was developed for binary TwoDOS as a stripe wise Viterbi detector ͑SWD͒. 18 However the complexity of the SWD for multilevel TwoDOS has prompted us to suggest a less complex scheme that exploits the properties of the multilevel 2-D readout channel.…”

Section: Symbol Detectionmentioning

confidence: 99%

Low complexity symbol detection method for multilevel 2-D optical storage based on a linear channel model

Moinian¹,

Fagoonee²,

Honary³

2005

Opt. Eng.

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This version is available at https://strathprints.strath.ac.uk/37083/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Abstract. A symbol detection scheme based on the Viterbi algorithm that simultaneously processes subsets of 2-D data in the presence of Gaussian noise was recently proposed for binary 2-D optical storage ͑TwoDOS͒. In the case of multilevel TwoDOS, a straightforward fullfledged maximum likelihood symbol detector, or even the previous Viterbi-based algorithm, is not an ideal solution due to complexity restrictions. We propose a suboptimum low complexity symbol detector, which still performs within the accepted performance bound for optical storage. We describe the procedures involved in designing and developing a practical symbol detection scheme for multilevel TwoDOS by analyzing the signal values generated by a linear channel model in the presence of Gaussian noise. Our proposed detection scheme exploits the properties of the 2-D data format on the disk, and is flexible enough to accommodate performance and complexity restrictions for optical storage applications.

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“…As a consequence, there has been a lot of work in reducing the complexity of detectors. There has been a lot of work on developing low-complexity trellis-based detectors [7]- [12]. In [13]- [17] belief propagation (BP) based detectors are used for the 2D ISI channel.…”

Section: Introductionmentioning

confidence: 99%

Linear programming based detectors for two-dimensional intersymbol interference channels

Kudekar

Johnson

Chertkov

2011

2011 IEEE International Symposium on Information Theory Proceedings

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Abstract-We present and study linear programming based detectors for two-dimensional intersymbol interference channels. Interesting instances of two-dimensional intersymbol interference channels are magnetic storage, optical storage and Wyner's cellular network model.We show that the optimal maximum a posteriori detection in such channels lends itself to a natural linear programming based sub-optimal detector. We call this the Pairwise linear program detector. Our experiments show that the Pairwise linear program detector performs poorly. We then propose two methods to strengthen our detector. These detectors are based on systematically enhancing the Pairwise linear program. The first one, the Block linear program detector adds higher order potential functions in an exhaustive manner, as constraints, to the Pairwise linear program detector. We show by experiments that the Block linear program detector has performance close to the optimal detector. We then develop another detector by adaptively adding frustrated cycles to the Pairwise linear program detector. Empirically, this detector also has performance close to the optimal one and turns out to be less complex then the Block linear program detector.

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Refinements of Multi-Track Viterbi Bit-Detection

Cited by 12 publications

References 12 publications

Two-Dimensional Optical Storage: High-Speed Read-Out of a 50 GByte Single-Layer Optical Disc with a 2D Format Using λ=405 nm and NA=0.85

Two-Dimensional Optical Storage: High-Speed Read-Out of a 50 GByte Single-Layer Optical Disc with a 2D Format Using λ=405 nm and NA=0.85

Low complexity symbol detection method for multilevel 2-D optical storage based on a linear channel model

Linear programming based detectors for two-dimensional intersymbol interference channels

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