Two-Dimensional Partial Response Maximum Likelihood with Constant-Weight Constraint for Holographic Data Storage
Autor: | Tetsuya Okumura, Jun Akiyama, Yoshiteru Murakami, Tetsuya Hayashi, Akira Takahashi, Shigemi Maeda |
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Rok vydání: | 2008 |
Předmět: |
Partial-response maximum-likelihood
Physics and Astronomy (miscellaneous) General Engineering General Physics and Astronomy Word error rate Holographic data storage Viterbi algorithm Image (mathematics) Constraint (information theory) symbols.namesake Amplitude symbols Constant (mathematics) Algorithm Mathematics |
Zdroj: | Japanese Journal of Applied Physics. 47:5971-5973 |
ISSN: | 1347-4065 0021-4922 |
DOI: | 10.1143/jjap.47.5971 |
Popis: | The areal density of holographic memory can be increased by decreasing the aperture size of the optical system; however, this causes the deterioration of a reproduced image due to the elimination of the high-frequency components of the image. We have developed two-dimensional partial response maximum likelihood (2D PRML), which is based on the previously proposed "decision feedback Viterbi algorithm" and added the new idea of the "constant-weight constraint (CW constraint)" and the "amplitude PR method". We have confirmed the improvement in error rate using 2D PRML compared with the conventional differential detection method in a high-density holographic memory system by simulation. |
Databáze: | OpenAIRE |
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