PRML Systems for Perpendicular Magnetic Recording
PRML Systems for Perpendicular Magnetic Recording
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用于垂直磁记录的 PRML 系统
DOI：
10.3379/jmsjmag.21.s2_399
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发表时间：
1997
影响因子：
--
通讯作者：
Y. Nakamura
中科院分区：
文献类型：
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作者：
H. Osawa;Yoshitake Kurihara;Yoshihiro Okamoto;H. Saito;H. Muraoka;Y. Nakamura
研究了磁流变头和双层垂直介质的部分响应最大似然（PRML）系统。本文分析了（1，7）码为正系数多项式、8/9码为负系数多项式的PRML系统的误比特率性能。与8/9码相比，（1，7）码的PRML系统具有较大的最小欧氏距离和较小的噪声谱。这导致了显著的性能改进。在本研究中讨论的PRML系统中，PR（1，2，3，2，1）ML表现出最好的性能，并且在误码率为10 - 4和归一化线性密度为2.5的情况下，对于8/9码，其SNR比PR 4 ML提高了约13.8 dB。PR（1，2，2，1）ML、PR（1，3，3，1）ML和PR（1，2，1）ML也表现出优异的性能。
Partial response maximum-likelihood(PRML) systems using an MR head and a double layer perpendicular medium are studied. The bit-error rate performance of PRML systems characterized by the polynomials with the positive coefficients for the (1,7) code and the negative coefficients for the 8/9 code is evaluated. The PRML system for the (1,7) code has a large minimum Euclidean distance and a small noise spectrum compared with those for the 8/9 code. This results in a significant performance improvement. Among PRML systems discussed in this study, PR(1, 2, 3, 2, 1)ML exhibits the best performance and improves the SNR by about 13.8 dB over that of PR4ML for the 8/9 code at a bit-error rate of 10−4 and a normalized linear density of 2.5. PR(1, 2, 2, 1)ML, PR(1, 3, 3, 1)ML and PR(1, 2, 1)ML also show excellent performance.