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
Rok vydání: 2008
Předmět:
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