Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance Analysis of Holographic Data Storage Depending on the Number of Levels Per Pixel of the Code Rate 1/2 Modulation Codes

부호율 1/2인 변조부호의 픽셀당 레벨 수에 따른 홀로그래픽 데이터 저장장치 성능 분석

  • Jeong, Seongkwon (School of Electronics Engineering, Soongsil University) ;
  • Lee, Jaejin (School of Electronics Engineering, Soongsil University)
  • 정성권 (숭실대학교 전자정보공학부) ;
  • 이재진 (숭실대학교 전자정보공학부)
  • Received : 2015.09.04
  • Accepted : 2015.09.25
  • Published : 2015.10.25
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Abstract

We propose three multi-level modulation codes of the code rate 1/2 for holographic data storage considered as a promising candidate for next generation storage systems. Since a pixel with multi-levels can represent more than 1 bit, it is possible to increase the storage capacity and have many codewords. Thus, we can choose a code that the minimum distance is as far as possible. When we compare the codes with the code rate 1/2, the performance of the code with small number of levels is better than that of large number of levels.

본 논문에서는 차세대 저장장치로 주목받고 있는 멀티레벨 홀로그래픽 데이터 저장장치에서 여러 가지 레벨의 변조부호를 제안하고 이들의 성능을 알아본다. 멀티레벨 변조부호는 한 픽셀에 1비트 이상 저장이 가능하기 때문에 저장용량을 증가시킬 수 있으며, 동일한 픽셀 개수에서 더 많은 코드워드의 표현이 가능하다. 따라서 코드워드간 최소거리가 큰 변조부호를 만들 수 있으며 이런 성질은 오류정정 능력을 가지는 변조부호를 구성할 수 있다. 부호율을 1/2로 고정하고 제안된 변조부호들의 성능을 조사한 결과, 레벨 수가 커서 최소거리가 큰 변조부호의 성능보다 낮은 레벨이기 때문에 최소거리가 작은 변조부호가 더 좋은 성능을 보였다.

Keywords

References

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