8/10PR1ML for high density and high rate tape storage systems

摘要

We applied class-1 partial response maximum likelihood (PR1ML) combined with a dc-free code rate of 8/10 (8/10PR1ML) in tape storage systems in which linear density was higher than 115 kbpi and channel rate was above 50 Mbps. This paper describes the performance of 8/10PR1ML in simulation and in practice, and of a parallel Viterbi detector specialized for PR1ML. A bit error rate of less than 10/sup -6/ was achieved at an areal density 265 Mbpi/sup 2/ in practice. The maximum clock frequency of the parallel Viterbi detector was MIN. 75 MHz, TYP. 120 MHz and its size was less than 1200 gates.