Modelling and signal processing for the nonlinear thin film recording channel
R.D. Barndt, Jack K. Wolf · 1992. Digests of Intermag. International Magnetics Conference · 1992
Our goal is to determine whether disk storage capacity can be increased by reducing the transition spacing to the point where a significant amount of nonlinearity occurs. This is investigated by allowing a sequence detector with unlimited complexity and assuming an ideal read channel as discussed below. We will make the assumption that the detection is done in the presence of additive white Gaussian noise, so that the Euclidean distance between sequences is the appropriate metric. The complexity of the sequence detector will be assumed sufficient to determine the data sequence that would result in a noise free waveform closest in distance to the observed (noisy) write channel output.