Non-binary protograph-based LDPC codes for 2-D ISI magnetic recording channels

Two dimensional (2-D) inter-symbol-interference (ISI), consisting of ISI in the down track direction and inter-track interference (ITI) along the cross-track direction, is a major factor that severely degrades the performance of ultra-high density magnetic recording systems. In this work, we propose a modified protograph extrinsic information transfer (EXIT) analysis, based on which we design novel NP-LDPC codes for 2-D ISI channels. II.