A multi-track recorded-bit patterning scheme for bit-patterned media recording system

Abstract

The inter-symbol interference (ISI) and inter-track interference (ITI) become a major impairment in bit-patterned media recording (BPMR) because of small bits and track pitches. One way to alleviate ISI and ITI is to encode a data sequence before recording. In general, a two-dimensional (2D) coding scheme is used for this purpose; however, it requires lots of redundant bits, thus lowering a code rate. This paper proposes a novel 2D coding scheme, referred to as a multi-track recorded-bit patterning (M-RBP) scheme, with a high code rate to combat both ISI and ITI effects. Specifically, the data bits will first be patterned by finding the best pattern based on a look-up table before recording that can avoid severe ISI and ITI effects. Simulation results indicate that the proposed scheme can provide a significant signal to noise ratio (SNR) performance improvement when compared to the system without any coding and yield for about 1 dB gain at BER = 10-4.