2-D Interference Channel Segmentation for Modified Factor Graph-Based Detection on BPMR System
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Abstract
Increasing the areal density of the bit-patterned media (BPMR) recording system can be achieved by reducing the size of the magnetic grains. However, this increases the problem of inter-track interference, also referred to as two-dimensional (2-D) interference channels, which can degrade the performance of the read channel in magnetic recording systems. To alleviate the effects of the 2-D interference channel on the BPMR system. This work proposes two methods of improved factor graph-based (FGB) detection using a segmentation of the 2-D interference channel coefficients that exploits the relationship between the main bit and its nearest neighbors. Similarly, the scheme of message-passing is a hierarchy based on levels from neighboring bits to the main bit. Simulation results show the bit error rate (BER) performance between the conventional FGB detector and the modified FGB detectors on the BPMR channel at an areal density of 3 Tb/in2 with multi-track processing. The BER performance of both modified FGB detectors outperforms the conventional FGB detector.
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