KMITL

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

Browse

Settings

Author: search.filters.author.Warisarn, ChanonSubject: search.filters.subject.Bit-flipping technique

Search Results

Now showing 1 - 1 of 1
  • 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.