The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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4-level Error Correcting Modulation Codes for Holographic Data Storage System

홀로그래픽 데이터 저장장치를 위한 4-레벨 오류정정 변조부호

  • Lee, Jaehun (Soongsil University, School of Electronic Engineering) ;
  • Lee, Jaejin (Soongsil University, School of Electronic Engineering)
  • Received : 2014.09.15
  • Accepted : 2014.09.23
  • Published : 2014.10.31
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Abstract

Mutilevel holographic data storage systems have a big advantage for capacity since it can store more than one bit per pixel. For instance, 2/3 modulation code stores 2/3(symbol/pixel) and 4/3(bit/pixel). Then it is about 1.3 bits per one pixel. In this paper, we propose two 4-level modulation codes, which have the minimum Euclidean distances of 3 and 4, respectively. The proposed codes perform better than random data. The performance of larger minimum distance code shows better than that of shorter one.

멀티레벨 홀로그래픽 데이터 스토리지 시스템은 픽셀당 1비트 이상을 저장할 수 있기 때문에 용량에서 큰 이점을 갖는다. 만약 부호율이 2/3인 변조부호라면 2/3(symbol/pixel)은 4/3(bit/pixel)이고, 이것은 1pixel에 약 1.3개 bit를 담을 수 있다. 본 논문에서는 멀티레벨 홀로그래픽 데이터 저장장치에서 한 픽셀이 4-레벨을 가지는 경우, 최소 유클리디안 거리가 3과 4인 변조부호를 각각 제안하였다. 제안한 변조부호는 랜덤한 경우보다 훨씬 더 좋은 성능을 보였고, 거리가 클수록, 성능이 더 좋아지는 것을 보였다.

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References

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