Abstract
The partial response maximum-likelihood (PRML) systems for perpendicular magnetic recording using an MR head and a double-layered medium are studied. The bit error rate performance of PRML systems characterized by the polynomials with the positive coefficients and conventional PRML systems with the negative coefficients for the 16/17(0,6/6) code is evaluated by computer simulation. Among PRML systems discussed in this study, PR(1,2,2,1)ML exhibits the best performance and improves the SNR by about 6.2dB over that of EPR4ML at a bit error rate of 10-4 and a normalized linear density of 2.5. At high linear density, the performance of PR(1,2,3,2,1) ML for the 16/17(0,6/6) code is superior to that of PR(1,2,3,2,1)ML for the (1,7)RLL code.
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