A Simple Inter-Track Interference Subtraction Technique in Bit-Patterned Media Recording (BPMR) Systems

Chaiwat BUAJONG  Chanon WARISARN  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.5   pp.404-408
Publication Date: 2018/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.404
Type of Manuscript: PAPER
Category: Storage Technology
2D modulation code,  multi-track multi-head recording,  bit-patterned media recording (BPMR),  intertrack interference (ITI) subtraction,  

Full Text: PDF>>
Buy this Article

In this paper, we demonstrate how to subtract the intertrack interference (ITI) before the decoding process in multi-track multi-head bit-patterned media recording (BPMR) system, which can obtain a better bit error rate (BER) performance. We focus on the three-track/three-head BPMR channel and propose the ITI subtraction technique that performs together with a rate-5/6 two dimensional (2D) modulation code. Since the coded system can provide the estimated recorded bit sequence with a high reliability rate for the center track. However, the upper and lower data sequences still be interfered with their sidetracks, which results to have a low reliability rate. Therefore, we propose to feedback the data from the center and upper tracks for subtracting the ITI effect of the lower track. Meanwhile, the feedback data from the center and lower tracks will be also used to subtract the ITI effect of the upper track. The use of our proposed technique can effectively reduce the severity of ITI effect which caused from the two sidetracks. The computer simulation results in the presence of position and size fluctuations show that the proposed system yields better BER performance than a conventional coded system, especially when an areal density (AD) is ultra high.