Perpendicular and longitudinal recording: A signal-processing and coding perspective

Equalization and noise prediction followed by sequence detection and postprocessing are studied for double-layer perpendicular recording channels that are corrupted by electronics and transition noise. The performance of various outer coding schemes, such as conventional Reed-Solomon codes with 8- and 10-bit symbols and low-density parity check codes, is evaluated, and a signal-processing and coding perspective is presented, for both longitudinal and perpendicular recording channels. Finally, the capacity of recording channels is characterized.