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    Performance of Log-MAP algorithm for graph-based detections on the 2-D interference channel
    (2014-01-01)
    Sopon, Thanomsak
    ;
    Supnithi, Pornchai
    ;
    Vichienchom, Kasin
    The read channel of magnetic recording system is affected by two-dimensional interference channel that is a combination of inter-symbol interference and inter-track interference. Inter-track interference is one of the biggest challenges in the high density magnetic recording systems and it can degrade the performance of the channels. In this work, we compare three variations of log-MAP algorithms for graph-based detectors in two-dimensional interference channels. The simulation results show the performance of the graph-based detector with the full log-MAP and extended log-MAP algorithms achieve the gains of about 0.1 and 0.05 dB at BER = 10<sup>-5</sup>, over the max approximation on bit patterned media recording system with the areal density 2.5 Tbits/in<sup>2</sup>. © 2014 IEEE.
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    Modified graph-based detection methods for two-dimensional interference channels
    (2012-10-29)
    Sopon, Thanomsak
    ;
    Myint, Lin Min Min
    ;
    Supnithi, Pornchai
    ;
    Vichienchom, Kasin
    Two-dimensional (2-D) interference channels with inter-symbol interference (ISI) and inter-track interference (ITI) exist in the magnetic recording systems at high areal density. A number of 2-D detection methods have recently been proposed for the multi-track processing of the 2-D channels. Graph-based detector with the belief propagation algorithm appears as an alternative method, but at a degraded performance and high complexity level. In this work, we propose two methods to modify the graph-based (GB) detector. One applies a serial scheduling to the GB detector, while the other modifies the GB detection by ignoring some connections during one direction of the reliability updates in the factor graph leading to the reduction of short cycles. The simulation results show that the proposed GB detectors give better bit error rate performances than the other GB detectors. © 2012 IEEE.