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- W1964984847 abstract "Volume holographic memories (VHM) are page-oriented optical storage systems whose pages commonly contain on the order of one million pixels. Typically, each stored data page is composed of an equal number of binary pixels in either a low-contrast (off) state or a high-contrast (on) state. By increasing the number of off pixels and decreasing the number of on pixels per page, there is an associated gain in VHM system storage capacity. When grayscale pixels are used, a further gain is possible by similarly controlling the fraction of pixels at each gray level. This paper introduces a constant-weight, nonbinary, shortened enumerative permutation modulation block code to produce pages that exploit the proposed capacity advantage. In addition to the code description, we present an encoder and a low-complexity maximum-likelihood (ML) decoder for the shortened permutation code. A proof verifies our claim of ML decoding. Applying this class of code to VHMs predicts a 49% increase in storage capacity when recording modulation coded 3-bit (eight gray level) pixels compared with a VHM using a binary signaling alphabet and equal-probable (unbiased) data." @default.
- W1964984847 created "2016-06-24" @default.
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- W1964984847 date "2001-04-01" @default.
- W1964984847 modified "2023-10-16" @default.
- W1964984847 title "Low-complexity maximum-likelihood decoding of shortened enumerative permutation codes for holographic storage" @default.
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- W1964984847 doi "https://doi.org/10.1109/49.920186" @default.
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