I. Introduction
Two-dimensional magnetic recording (TDMR) aims at achieving user bit densities >1 Tb/in2 by reducing the size of a bit and using sophisticated signal processing algorithms. Reducing the track width introduces intertrack interference along with the intersymbol interference (ISI) within a track. When the bit size is comparable with the magnetic grain size, media noise arising due to the irregularities in the recording medium becomes more prominent, requiring a 2-D ISI detector for handling media noise.