Structured LDPC Codes With Reversed MTR/ECC for Magnetic Recording Channels

We propose a system for magnetic recording channels where we use a novel structured low-density parity-check (LDPC) code, called a random interleaved array (RIA) code, combined with a reversed maximum-transition run code/error-correction code. Simulation results show that the RIA code provides a significantly better error-rate floor performance than the conventionally structured LDPC code when applied to perpendicular magnetic recording channels. They also show that the system can achieve a 1.2-dB gain at a sector error rate of 10
^-5
compared with a PRML system combined with a high-rate run-length-limited code