Efficient coding technique for holographic storage using the method of guided scrambling

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

“…A holographic data storage channel requires modulation codes to mitigate two-dimensional intersymbol interference (2D ISI) to maintain the ratio of ON and OFF pixels, thereby reducing interpage interference (IPI). 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.…”

Error Correcting 4/6 Modulation Codes for Holographic Data Storage

“…To combat the IPI, the numbers of zero and one pixels must be maintained in a constant ratio. 6) Second, since the data are read by a charge-coupled device (CCD), a blur effect, i.e., the two-dimensional intersymbol interference (2D ISI), occurs, which negatively impacts the bit error rate (BER) performance. Therefore, to interpret the correct data, these two problems must be addressed.…”

“…6,7) Several modulation codes have been proposed to remove the fatal 2D ISI patterns. But, because the previous accomplishments have a low code rate, it is difficult to achieve coding gain.…”

“…Modulation codes for holographic data storage can mitigate the effects of 2D ISI and also maintain a constant ratio of dark and light pixels to mitigate the effects of IPI. 6,7) Several modulation codes have been proposed to remove the fatal 2D ISI patterns. But, because the previous accomplishments have a low code rate, it is difficult to achieve coding gain.…”

Integer Programming Model and Heuristic on the Guided Scrambling Encoding for Holographic Data Storage

“…홀로그래픽 저장장치에 GS 인코딩을 적용할 때, 코드 워드의 최대 빛의 저장강도에 대한 성능평가 및 심볼 값이 균등한 코드워드에서 제어비트와 천이강도의 최 소값간의 관계에 대한 모의실험이 보고되었다 [7,8] . GS 코딩은 홀로그래픽 저장장치 이외에 OFDM의 peak-to-average power ratio(PAPR) 감소를 위한 코딩 및 광기록 저장장치를 위한 변조코드의 직 류성분 제거를 위한 코딩 연구에서도 사용되었다 [9,10] .…”