Error-Correcting 7/9 Modulation Codes For Holographic Data Storage

초록

Holographic data storage (HDS) has a number of advantages, including a high transmission rate through theuse of a charge coupled device array for reading two-dimensional (2D) pixel image data, and a high densitycapacity. HDS also has disadvantages, including 2d intersymbol interference by neighboring pixels and interpageinterference by multiple pages stored in the same holographic volume. These problems can be eliminated bymodulation codes. We propose a 7/9 error-correcting modulation code that exploits a Viterbi–trellis algorithm andhas a code rate larger (about 0.778) than that of the conventional 6/8 balanced modulation code. We showimproved performance of the bit error rate with the proposed scheme compared to that of the simple 7/9 codewithout the trellis scheme and the 6/8 balanced modulation code.

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