Abstract
The partial response maximum likelihood (PRML) systems characterized by the higher order polynomials for perpendicular magnetic recording using a double-layered medium are studied. The relationship between the required SNR to achieve a bit erorr rate of 10-4 and a normalized linear density for (1,7)RLL and 16/17(0,6/6) coded PRML systems is obtained by computer simulation and compared with that of the conventional 16/17(0.6/6) coded EPR4ML system. The results show that among PRML systems discussed in this study the (1,7)RLL coded PR(1,2,3,3,2,1) ML,PR(1,2,1,0,-1,-2,-1)ML and PR(1,1,1,0,-1,-1,-1)ML systems and the 16/17(0,6/6) coded PR(1,2,3,3,2,1)ML,PR(1,3,4,4,3,1)ML and PR(1,2,1,0,-1,-2,-1)ML systems provide excellent performance and are superior to that of the 16/17(0.6/6) coded EPR4 ML system.
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