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2-D Signal Processing and Coding for Digital Page- Oriented Memories
2-D Equalization, Detection and Coding for Digital Non-linear Page-Oriented Volume Holographic Memories
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Digital page-oriented Volume Holographic Storage §(VHS) is a promising digital storage technology §because of its high data storage density, high data §rate and short access times. As the storage density §increases, the performance of volume holographic §storage channels is degraded due to increased two-§dimensional (2-D) intersymbol interference (ISI) and §noise. The output detector array in VHS detects the §intensity of the incident light wave-front leading §to sign information loss. This sign loss precludes §the applicability of conventional §equalization/detection schemes to mitigate ISI. In §this book, we first address channel modeling under §the quadratic nonlinearity and then develop 2-D §equalization/detection methods such as linear §minimum mean square (LMMSE) equalization, iterative §magnitude square decision feed back equalization §(IMS DFE) and partial response maximum likelihood §(PRML) to mitigate 2-D ISI under quadratic §nonlinearity. We also evalu ate the effect of §modulation coding, particularly balanced codes and §low pass coding. We finally investigate the §performances of the equalization/detection methods §under optical magnification error.
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