A New Two-Dimensional Pseudo-Random Modulation Code for Holographic Data Storage

Modulation Codes for Optical Data Storage

“…The codeword complementing block modulation code (Hwang et al, 2003) adopts an indirect encoding scheme so as to satisfy the pseudo-balanced constraint and thus achieve uniform spectrum of the modulated pages. The coding procedure consists of two steps: constant weight encoding and selective complementary encoding.…”

Iterative Decoding between Two-Dimensional Soft Output Viterbi Algorithm and Error Correcting Modulation Code for Holographic Data Storage

“…1,2) In order to reduce 2D ISI, researches have been conducted to eliminate fatal isolated patterns (i.e., where the pattern is surrounded by different pixels). [3][4][5][6][7] However, they do not have extra coding gain, unlike modulation codes with a trellis structure. [8][9][10] In particular, Kim et al introduced an error correcting the modulation code for holographic data storage.…”

Misalignment Compensation and Equalization for Holographic Data Storage

“…The retrieved images from the HDDS system typically have a very low signal-to-noise ratio (SNR); therefore, an effective signal processing scheme is required for a reliable data readout. [2][3][4][5] In this paper, we introduce a misalignment compensation scheme to remove an undesired signal error due to misalignment between data and detector pixels, and an equalization technique based on a two-dimensional (2D) modulation code to reduce the detection error due to bright ''Off'' and dark ''On'' pixels in a retrieved data page. Generally, the intensity of data pixel decreases from the center to the edges of the retrieved data page.…”