An estimation technique for accurately modeling the magnetic recording channel including nonlinearities

A channel model called modified superposition and dan estimation technique for the parameters of this model are presented to model the magnetic recording channel including nonlinearities. It is shown that this model and estimation technique can describe the magnetic recording channel including nonlinearities much more accurately than simple superposition with isolated transient response. Computer software was developed to extract automatically the three nonlinear parameters from a single measured waveform. As an example of the usefulness of this estimation technique, experiments were conducted on a 1300 Oe, 3×10^-3 emu/cm² thin-film disk using a 3380E 18-turn thin-film head at 70 mA pk-pk current and 23 m/s velocity