R&D: Double-Layer Magnetic Recording with Multilayer Perceptron Decoder for Single-Reader/Two-Track Reading in BPMR Systems

AIP Advances has published an article written by N. Rueangnetr, Advanced Signal Processing for Data Storage (ADaS) Research Unit, College of Advanced Manufacturing Innovation (AMI), King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand, S. Koonkarnkhai, P. Kovintavewat, Advanced Signal Processing for Disruptive Innovation Research Center, Nakhon Pathom Rajabhat University (NPRU), Nakhon Pathom 73000, Thailand, and C. Warisarn, Advanced Signal Processing for Data Storage (ADaS) Research Unit, College of Advanced Manufacturing Innovation (AMI), King Mongkut’s Institute of Technology Ladkrabang (KMITL), Bangkok 10520, Thailand.

Abstract: “To expand an areal density of hard disk drives, bit-patterned magnetic recording (BPMR) using a patterned medium instead of a granular medium as employed in perpendicular magnetic recording is attracting much attention as the next-generation recording technology. To further increase the storage capacity of BPMR, multi-layer magnetic recording can be combined with BPMR. Therefore, this paper considers double-layer magnetic recording with a single-reader/two-track reading technique for the staggered BPMR system, which is performed together with a rate-3/5 modulation code. This paper proposes to utilize a multilayer perceptron decoder to decode and estimate the log-likelihood ratio value of the recorded bit sequence that is obtained from the equalized channel. Simulation results show that at a bit-error rate of 10⁻⁴, the proposed system with a double-layer recording medium can achieve an improvement gain of about 1.2 decibel if compared to that with a regular single-layer recording medium, even in the presence of media noise.“