KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Supnithi, PornchaiSubject: search.filters.subject.Inter-track interference

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    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.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Iterated Viterbi detection methods for a 2-D bit patterned mediastorage
    (2010-01-01)
    Myint, Lin M.M.
    ;
    Supnithi, Pornchai
    ;
    Tantaswadi, Prinya
    In this paper, we studied the performance of the iterated Viterbi detection methods using the multi-track multi-head processing for a bit patterned media (BPM) channel with a two-dimensional interference consisting of inter-symbol interference (ISI) and inter-track interference (ITI). In each method, three Viterbi detectors are employed to process the three readback signals. In their trellises, the number of states is designed based on the ISI only. After the first iteration, the estimated output sequences are exchanged between the adjacent detectors as the ITI estimations and then used in the metric calculation of next iteration. When compared with other methods, the simulation results show that the proposed methods achieve significant gains. We also investigated the performance of the proposed methods for the BPM channel with different media noise levels. Finally, the computational complexity of all detectors is compared.