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Predecessor
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Displaying 1-8 of 8 articles from this issue
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Article type: Cover
Pages Cover1-
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (16K) -
Article type: Index
Pages Toc1-
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (33K) -
Hidetoshi SAITO, Yoshihiro OKAMOTO, Hisashi OSAWAArticle type: Article
Pages 1-8
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA method to construct trellis codes matched to class-4 partial response (PR4) and exteded class-4 partial response (EPR4) channels is studied. This coding method is based on the technique of set partitioning. In our method, all allowable output symbols from a partial response channel are defined as a signal constellation in Euclidean space and each subset decomposition of defined signal constellation is adopted in a multidimensional Euclidean space. Using this code construction technique, we can find optimal trellis coding and analyze a code structure easily and effectively. As a result of this coding technique, it is shown that the rate 9/10 trellis codes with a constraint length of 6 or 7 can provide about 2.4,2.3dB advantage over the conventional rate 8/9 (0,4/4) code in a PR4ML and 16/17 (0,6/6) code in an EPR4ML equalizations at a bit error rate of 10^<-4>, respectively.View full abstractDownload PDF (808K) -
Hisashi Osawa, Kazuyuki Fujikawa, Yoshihiro Okamoto, Hidetoshi SaitoArticle type: Article
Pages 9-16
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe error rate performsnce of the fixed-delay tree search with decision feedback (FDTS/DF) system using a neural network instead of the conventional linear forward and feedback filters is studied. First, a model of the read/write channel with partial erasure and the FDTS/DF system with a neural network are described. Then, the bit-error rate of the FDTS/DF system using a neural network is evaluated by computer simulation and the performance is compared with that of the conventional FDTS/DF system with the linear forward and feedback filter. The results show that the proposed FDTS/DF system exhibits better performance than the conventional FDTS/DF system.View full abstractDownload PDF (665K) -
Jin CHEN, Shunji ISHIOArticle type: Article
Pages 17-22
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe magnetic properties, erased magnetic structure and inter-granular magnetic interaction for CoCrTa/Cr longitudinal recording media are discussed to understand the formation of magnetic cluster and its influence on medium noise. It is found that different magnetic stability (H_c) has different influence on the formation of magnetic cluster. Properly small grain size is benefit to lessen the size of magnetic cluster. Besides, the self-demagnetization resulted in reversal magnetization is considered to be a main reason for magnetic cluster formation.View full abstractDownload PDF (528K) -
E. Miyashita, Y. Yoneda, J. NumazawaArticle type: Article
Pages 23-28
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSRecorded magnetization distributions of perpendicular magnetic media were calculated and the signal and the noise of that magnetization distribution were analyzed. From that analysis, the following results were obtained. The signal is not proportional to the saturation magnetization and the increasing rate of the signal is lower than that of the saturation magnetization. The noise increases proportional to the saturated magnetization approximately for the short wavelength, but that doesn't increases proportionally for the long wavelength. For both the long wavelength and the short wavelength, the signal increases with decreasing the anisotropic field dispersion but the noise decreases.View full abstractDownload PDF (672K) -
S.J. Greaves, H. Muraoka, Y. Nakamura, Y. SugitaArticle type: Article
Pages 29-36
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSPerpendicular recording media were simulated using a model based on the Landau-Lifshitz-Gilbert (LLG) equation. We included a random component in the calculation of the effective field in order to study time dependence phenomena. In single layer media, the time dependence of magnetisation was found to be large following saturation of the media, for bilayer media the time dependence was reduced. The time dependence of written bits was also investigated and found to be much lower than for the saturated media. In addition, the time dependence decreased further as the bit density increased.View full abstractDownload PDF (639K) -
Article type: Appendix
Pages App1-
Published: June 12, 1998
Released on J-STAGE: June 23, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (75K)
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