Optimization of differential code in Holographic Data Storage －Improvement of error correction characteristics－

Abstract

Dot selection method in 5:9 modulation code of holographic data storage was considered. Two cases were picked up and distance in each white dot was calculated. The 4 cases which had 8 shorter distances in 9 dots were eliminated. Moreover the cases, which had short distance in 9 dots, were set short distance in 5 bit data. As the results of simulation, improvements of hard detection were 2 ~ 3 % and iteration characteristics of LDPC were also improved.