Systems modeling of nonlinear effects in high density digital magnetic recording

Abstract

We propose a new nonlinear model for high density magnetic recording systems. Unlike previous Volterra series methods, this model can be constructed based on simple measurements of the isolated transition response and dibit responses. The experimental results show that the proposed nonlinear model accurately predicts the channel output over the entire length of the 1023-bit maximum length pseudo-random binary testing sequence. The validity of our model is also confirmed through the use of a nonlinear canceler in conjunction with class IV partial response (PR4) equalization.