Low-Density Parity-Check Coding for Holographic Data Storage

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概要

• 論文の詳細を見る

• Since the signal-to-noise ratio (SNR) of a holographic storage system is one of the dominant factors that determine the recording capacity, an improvement in SNR is crucial to the achievement of a high recording capacity. We therefore applied a low-density parity-check (LDPC) code and its soft iterative decoding to a holographic storage system. We examined the bit error rate (BER) performance by simulation and experiment, using the LDPC code as an error correction code and a 2:4 modulation code as a recording code. The simulation revealed that the LDPC code shows an SNR improvement of 5.3 dB and a coding gain of 4.8 dB at a BER of $1\times 10^{-5}$. The experiment indicated that an LDPC decoder completely corrects bit errors in a signal, which is reproduced from a recorded hologram, with an SNR of 12.5 dB and a raw BER of $1.3\times 10^{-2}$. The LDPC coding is thus effective in achieving a high recording capacity.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2005-05-15

著者

• HAYASHI Hideki

  Optical Disk System Development Center, Matsushita Electric Industrial Co., Ltd.

• Hayashi Hideki

  Optical Memory Team, Storage Lab., Samsung Yokohama Research Institute, 2-7 Sugasawa-cho, Tsurumi-ku, Yokohama 230-0027, Japan

• Kimura Kazuhiko

  Optical Memory Team, Storage Lab., Samsung Yokohama Research Institute, 2-7 Sugasawa-cho, Tsurumi-ku, Yokohama 230-0027, Japan

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• Low-Density Parity-Check Coding for Holographic Data Storage

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