A Study of GS coded PRML System in Perpendicular Magnetic Recording

Abstract

The performance of guided scrambling (GS) coded PRML system in a perpendicular magnetic recording channel with jitter-like media noise and distortion due to low frequency cutoff is studied. The bit error rate performance of PR2ML systems for two types of GS codes, Galois field (GF) additive type and convolutional operation type, is obtained and compared with that of conventional Reed-Solomon (RS) coded PR2ML system. The results show that the SNR improvements of GS coded PR2ML systems over RS coded PR2ML system are about 9.3 dB for GF additive type code and 8.3 dB for convolutional operation type code at a normalized linear density of 1.5, a power ratio of jitter-like media noise of 80% and a low-cutoff frequency normalized by bit rate of 0.003.