Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2016
Session Number:M2-3
Session:
Number:M2-3-2
Soft Information Adjustment Scheme of a Rate-4/5 2D Modulation Code in Bit-Patterned Media Recording Systems
Wongsatorn Teeraruangchaisri, Chavisa Kanjanakunchorn, Chanon Warisarn, Chaiyan Jettanasen ,
pp.167-170
Publication Date:2016/7/10
Online ISSN:2188-5079
Summary:
In bit-pattern media recording (BPMR) systems, the readback signal of the desired track is severely interfered from the adjacent tracks, which known as the inter-track interference (ITI). One way to cope this problem is to use the 2-dimensional (2D) coding e.g., a rate-4/5 2D modulation code. Although the rate-4/5 modulation code ensures that the readback signal of the three inner tracks will not be corrupted by severe ITI; however, both the lowermost and the uppermost tracks can still be interfered by the outer tracks, which may lead to some errors in the data recovery process. To improve this shortcoming, we propose the soft-information adjustment scheme to adjust the soft-information before decoding. The relationship of the data encoding condition will be used as a criterion for adjusting the soft-information. Simulation results indicate that the proposed system is better than the conventional system, especially when AD and/or the position jitter are high.