关键词: 部分响应最大似然 预编码 自适应数字均 Viterbi译码

Abstract:

The growing demand in high-density, quick equipment boosts the rapid development of the read/write channel technology. As a signal processing technology being widely used in the channel, PRML plays an important role in improving hard disk density. In this paper, a simulation model of the PRML signal system is proposed and created. The design of all the important aspects in the PRML system is especially discussed and its accuracy is approved with the  inter-symbol inter-ference and without inter-symbol interference respectively. The system can not only be used as an experimental platform for designing  disk read/write channels, but its results can be taken as the theoretical basis for optimizing the existing read/write channels.

Key words: PRML, precode, adaptive digital equalization, Viterbi decode