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

The Institute of Electronics and Information Engineers (대한전자공학회)
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Performance of LDPC Product Code According to Error Factors on Holographic Data Storage System

홀로그래픽 데이터 저장장치 시스템에서 오류요인에 따른 LDPC 곱부호의 성능

  • Jeong, Seongkwon (Department of ICMC convergence technology, Soongsil University) ;
  • Lee, Jaejin (School of Electronics Engineering, Soongsil University)
  • 정성권 (숭실대학교 정보통신소재융합학과) ;
  • 이재진 (숭실대학교 전자정보공학부)
  • Received : 2017.03.13
  • Accepted : 2017.04.07
  • Published : 2017.05.25
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Abstract

Holographic data storage system (HDSS) features short access times, high storage capacities, and fast transfer rates, since the data is recorded and read not by lines but by pages within a volume of holographic material. Burst error caused by physical impact on the high density storage system becomes very longer than that of conventional storage systems. This paper proposes an LDPC product code using two LDPC code to resolve burst error. When a total code rate is similar, the performance of two LDPC code having high code rate is better than that of one LDPC code having low code rate. Also, with error factors of two-dimensional intersysbol interference and misalignment, the proposed scheme can improve the performance in holographic data storage system.

홀로그래픽 데이터 저장장치 시스템은 데이터를 줄 단위로 처리하는 것이 아닌 홀로그래픽 매질에 페이지 단위로 처리하기 때문에 빠른 접근 시간, 고용량, 높은 전송 속도의 장점을 갖는다. 하지만 고밀도 저장장치일수록 물리적인 영향에 의해 발생되는 연집오류의 길이는 기존의 저장장치보다 더욱 크다. 본 논문에서는 두 개의 LDPC 부호를 이용한 곱부호 방식을 사용하여 연집오류의 해결 성능을 알아본다. 제안하는 곱부호는 유사한 코드율 일 때, 코드율이 낮은 하나의 LDPC를 사용하는 하는것 보다 코드율이 높은 두개의 LDPC 부호를 이용하는 것이 더 좋은 성능을 보였다. 또한 2차원 인접 심볼간 간섭 및 어긋남이 발생하여도 성능을 향상시킬 수 있다.

Keywords

References

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