SNR Evaluation of Punctured Convolutional Coded PR4ML System in Digital Magnetic Recording with Partial Erasure Effect

Yoshihiro OKAMOTO  Minoru SOUMA  Shin TOMIMOTO  Hidetoshi SAITO  Hisashi OSAWA  

IEICE TRANSACTIONS on Electronics   Vol.E80-C   No.9   pp.1154-1160
Publication Date: 1997/09/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High Density Information Recording Technologies)
digital magnetic recording,  PRML system,  punctured convolutional code,  partial erasure,  

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A punctured convolutional coded PR4ML system for digital magnetic recording, which applies a punctured coding method to the convolutional code and records the punctured code sequences on two tracks, is proposed. In this study, the bit error rate performance of the proposed system is obtained by computer simulation taking account of partial erasure, which is one of the nonlinear distortions at high densities, and it is compared with those of a conventional 8/9 coded PR4ML system and an I-NRZI coded PR4ML system. The results show that the proposed system is hardly affected by partial erasure and exhibits good performance in high-density recording. A bit error rate of 10-4 can be achieved with SNR's of approximately 13.2 dB and 9.1 dB less than those of the conventional 8/9 coded and I-NRZI coded PR4ML systems, respectively, at a normalized linear density of 3.