A two-dimensional constant-weight sparse modulation code for volume holographic data storage

Gu, Huarong; Cao, Liangcai; He, Qing-sheng; Jin, Guofan

doi:10.1631/jzus.c1010246

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…The physical pages and holograms are converted by modulation coding, and the specific modulation depends on the optical path mechanism of HDS [5] . The amplitude modulation is the most basic coaxial HDS coding scheme [6][7] . This scheme generally uses a 3:16 coding scheme, that is, there are merely 3 non-adjacent bright pixels in a 4×4 pixels data block, so the coding rate of this scheme is 0.5 [8] .…”

Section: Introductionmentioning

confidence: 99%

An efficient two-stage reading scheme for recorded data frame of amplitude-modulation coaxial holographic data storage

Zhan

Zhang

Cao

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

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Optical holographic data storages (HDS) with high theoretical-capacity have been researched for more than two decades. Among them, coaxial HDS receives the most attention. Amplitude-based coding in coaxial HDS systems is fundamental and generally employs a 3:16 modulation scheme that sets merely 3 non-adjacent bright pixels within a 4*4 pixel-block, called as Three-Level Format (TLF). Unfortunately, TLF data frame recorded upon the disc is difficult to be retrieved accurately in the practice. In our previous work, we experimentally analyzed inaccurate TLF data frames recognition and its corresponding factors. The core issue is how to accurately and fast locate TLF data frame in encoded image. Thus, we have to use some image processing techniques such as Gaussian blur to assist in locating TLF data frame. However, using image processing techniques will inevitably introduce long processing-time. Therefore, we propose an efficient two-stage decoding scheme. In the first stage, we locate TLF data frame in encoded images and calculate scaling multiplier (about 1.9s). In the second stage, we calculate the coordinates of all data points and read them (about 0.08s). For the first image of a batch, we execute complete two-stage process, but the subsequence images are no longer to perform the first stage and only fine-tuning TLF data frame location. The experimental results show that the average latency of reading an image is reduced by 1.9s. The average data point error rate is 3.1%, and the average data block error rate is 7.8%, consistent with the results of executing complete process.

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Section: Introductionmentioning

confidence: 99%

An efficient two-stage reading scheme for recorded data frame of amplitude-modulation coaxial holographic data storage

Zhan

Zhang

Cao

et al. 2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

View full text Add to dashboard Cite

show abstract

“…Now, LDPC can maintain error correction capability when the continuous data damage is less than K1×SDSU length. So far, in actual work, we have adopted the LDPC(10,2) encoded method, LDPC encoded can tolerate continuous data corruption of 32B size. Interleaved the continuous data DSU blocks and parity data DSU blocks in the Physical Sector to complete the first-level interleaved of data.…”

mentioning

confidence: 99%

A multi-level encoded and interleaved data format for holographic data storage with high reliability and high recoverability

Wang

Cao

Xie

2023

Ninth Symposium on Novel Photoelectronic Detection Technology and Applications

A two-dimensional constant-weight sparse modulation code for volume holographic data storage

Cited by 10 publications

References 13 publications

An efficient two-stage reading scheme for recorded data frame of amplitude-modulation coaxial holographic data storage

An efficient two-stage reading scheme for recorded data frame of amplitude-modulation coaxial holographic data storage

A multi-level encoded and interleaved data format for holographic data storage with high reliability and high recoverability

System Margin of a Collinear Holographic Data Storage System

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