고밀도 DVD시스템을 위한 저 복잡도 검출 기법

Low-Complexity Detection Techniques for High-Density DVD Systems

  • 조한규 (연세대학교 전기전자공학과 정보통신 연구실) ;
  • 우중재 (연세대학교 전기전자공학과 정보통신 연구실) ;
  • 주만식 (연세대학교 전기전자공학과 정보통신 연구실) ;
  • 강창언 (연세대학교 전기전자공학과 정보통신 연구실) ;
  • 홍대식 (연세대학교 전기전자공학과 정보통신 연구실)
  • 발행 : 2002.10.01

초록

Partial response maximum likelihood (PRML)과 fixed-delay tree search with decision feedback (FDTS/DF)은 기록 재생 시스템에서 준최적 성능을 보이는 정보열 검출 기법 (sequence detection)으로 알려져 있다. 그러나, 정보열 검출 기법 고유의 metric 연산은 심각한 하드웨어 복잡도를 유발한다. 본 논문은 정보열 검출 기법의 복잡도 문제를 극복하기 위한 대안을 제시한다. 제안된 저 복잡도 기법들은 검출 과정에서 덧셈 및 곱셈의 수를 최소화하여 고속 프로세스 및 저 복잡도 하드웨어 구현에 적합하다. 결정 궤환 드화 깁버 (decision feedback equalization; DFE)을 결합하여 ${\tau}$=2 FDTS/DF와 동일한 성능을 보이며, 기록 밀도 S>5.6에서 PR(1111)ML의 성능을 능가함이 모의 실험을 통해 보여진다.

Partial response maximum-likelihood (PRML) and fixed-delay tree search with decision feedback (FDTS/DF) yield a sub-optimum performance in storage systems. However, they suffer from the inevitable complexity problems. this paper focuses on detection schemes to overcome the drawbacks of the sequence detections by exploiting minimum run-length d=2. It is expected that the proposed systems yield substantial reductions of both processing speed and receiver complexity. When combined with a decision feedback equalization (DFE), they prove to keep pace with the FDTS/DF with ${\tau}$=2 and even outperform the PR(1111)ML at normalized density S>5.6.

키워드

참고문헌

  1. Hangyu Cho, Jonghoe An, Sunghwan Ong, and Daesik Hong, 'Partial response maximumlikelihood system and crosstalk cancellation method for high-density optical recording,' Optical Engineering, 40(8), pp. 1621-1628, Aug. 2001 https://doi.org/10.1117/1.1386791
  2. P. Kabal, et al., 'Partial-Response Signaling,' IEEE Tran. Comm., 23(9), pp. 921-934, Sep. 1975 https://doi.org/10.1109/TCOM.1975.1092918
  3. D. J. Tyner, et al., 'Partial Response Equalizer Performance in Digital Magnetic Recording Channels,' IEEE Tran. Magn., 29(6), pp. 4194-4208, Nov. 1993 https://doi.org/10.1109/20.280863
  4. T. Narhara, et al., 'Partial-Response Maximum-Likelihood Detection Method for Magneto-Optical Recording,' Jpn. J. appl. Phys., 36(1B), pp. 549-556, Jan. 1997 https://doi.org/10.1143/JJAP.36.549
  5. J. J. Moon, et al., 'Perfomance Comparison of Detection methods in Magnetic Recording,' IEEE Tran. Magn., 26(6), pp. 3155-3172, Nov. 1990 https://doi.org/10.1109/20.102903
  6. J. W. M. Bergmans, Digital Baseband Transmission and Recording, Kluwer Academic Publishers, 1996
  7. C. H. Lee, et al., 'A PRML detector for a DVDR system,' IEEE Tran. Consumer Electron., 45(2), May 1999
  8. K. A. Schouhamer Immink, 'EFMplus: The Coding Format of the Multimedia Compact Disc,' IEEE Tran. Consumer Electron., 41(3), pp. 491-497, Aug. 1995 https://doi.org/10.1109/30.468040
  9. R. T. Lynch, Jr., 'Channels and Codes for Magnetooptical Recording' IEEE J on Sel Areas in Comm., 10(1), pp. 57-72, Jan. 1992 https://doi.org/10.1109/49.124469
  10. G. D. Forney, 'Maximum-likelihood Sequence Estimation of Digital Sequences in the Presence of Intersymbol Interference,' IEEE Tran. Inform. Theory, 18(3), pp. 363-378, May 1972 https://doi.org/10.1109/TIT.1972.1054829
  11. J. J. Moon, et al., 'Constrained-Complexity Equalizer Design for Fixed Delay Tree Search with Decision Feedback,' IEEE Tran. Magn., 30(5), pp. 2762-2768, Sep. 1994 https://doi.org/10.1109/20.312518
  12. B. Brickner, et al., 'A signal space representation of fixed delay tree search for use with d=0 codes,' Globecom '95, pp. 577-581, 1995
  13. Baldur Steingnmsson, et al., 'Signal spacedetection for DVD optical recoiding,' IEEE Tran. Magn., 37, pp. 670-675, Mar. 2001 https://doi.org/10.1109/20.917599
  14. J. G. Kenney, et al., 'Multi-level Decision Feedbakc Equalization for Saturation Recording,' IEEE Tran. Magn., 29(3), pp. 2160-2171, July 1993 https://doi.org/10.1109/20.221040
  15. Srini Gopalaswamy, et al., 'Equalizers for DVD read channel with d=1 modulation coding,' Optical Data Storage '97, 3109, pp. 95-97
  16. Srini Gopalaswamy, et al., 'Simple Detection Technique for d-2 Modulated Optical Recording Channels,' ICC '99, 3, pp. 1967-1971
  17. Toshiyuki, et al., 'A simple detection method for RLL Codes (Run detector),' IEEE Tran. Magn., 33(5), pp. 3262-3264, Sep. 1997 https://doi.org/10.1109/20.617911