KMITL

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

Browse

Settings

Author: search.filters.author.Busyatras, WiparatSubject: search.filters.subject.Bit-flipping technique

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    BER performance improvement using soft-information flipping method in BPMR systems
    (2019-07-01)
    Busyatras, Wiparat
    ;
    Warisarn, Chanon
    Inter-track interference (ITI) cancelation is one of the considerable challenges for high areal density (AD) magnetic recording such as bit-patterned magnetic recording (BPMR) technology. In literature, the two-dimensional (2D) modulation codes have been proposed to cancel the ITI effect which can efficiently improve the overall system performance, e.g., a rate5/6 2D modulation code. Although the rate-5/6 modulation code ensures that the readback signal of the center track will not be corrupted by severe ITI; however, both the upper and lower tracks can still be interfered by their sidetracks, which may lead to some errors in decoding process. To improve this shortcoming, we propose a bit-flipping technique that performs together with the rate-5/6 2D modulation code. Here, the relationship between the data encoding constraint and the soft-information obtained from the soft output Viterbi algorithm (SOVA) detector are utilized to be a criterion for flipping the ambiguous data bits. Simulation results indicate that the proposed system is better than the conventional coded system with and without media noise and track mis-registration (TMR) effects.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    A simple 2/3 modulation code and bit-flipping technique in bit-patterned media recording systems
    (2018-07-02)
    Busyatras, Wiparat
    ;
    Poompuang, Pitaya
    ;
    Myint, Lin M.M.
    ;
    Warisam, Chanon
    Two-dimensional (2-D) modulation code is considered as one of the key schemes to improve the areal density capability for next generation magnetic recording e.g., bit-patterned media recording (BPMR) technology, due to its advantages such as severe inter-track interference (ITI) suppression and user densities escalation. In this work, a rate-2/3 2-D modulation with a three-reader three-track (3R3T) system is studied where the positions of reader are accordingly optimized with the encoded criteria to obtain the highest bit-error rate (BER) performance. Moreover, we also propose a bit-flipping technique which is one way to extremely improve the overall system performance. Here, the soft-information that are obtained from soft-output Viterbit algorithm (SOVA) detectors will be improved according with the encoded criteria before sending to the proposed decoder. Simulation results demonstrate that significant performance gain can be achieved using these two proposed approaches.