Reliability-Based Hybrid ARQ Scheme with Encoded Parity Bit Retransmissions and Message Passing Decoding

Search this Article


    • KOIZUMI Daiki
    • Graduate School of Science and Engineering, Waseda University
    • MATSUSHIMA Toshiyasu
    • Department of Applied Mathematics, School of Fundamental Science and Engineering, Waseda University
    • HIRASAWA Shigeichi
    • Department of Industrial and Management Systems Engineering, School of Creative Science and Engineering, Waseda University


Reliability-based hybrid ARQ (RB-HARQ) is a kind of incremental-redundancy ARQ recently introduced. In the RB-HARQ, the receiver returns both NAK signal and set of unreliable bit indices if the received sequence is not accepted. Since each unreliable bit index is determined by the bitwise posterior probability, better approximation of that probability becomes crucial as the number of retransmissions increases. Assuming the systematic code for the initial transmission, the proposed RB-HARQ scheme has the following two features: (a) the sender retransmits newly encoded and interleaved parity bits corresponding to the unreliable information bits; (b) the retransmitted parity bits as well as the initial received sequence are put all together to perform the message passing decoding i.e. the suboptimal MAP decoding. Finally, simulation results are shown to evaluate the above two features.


  • IEICE Trans. Fundamentals, A

    IEICE Trans. Fundamentals, A 90(9), 1736-1744, 2007-09-01

    The Institute of Electronics, Information and Communication Engineers

References:  9

Cited by:  1


  • NII Article ID (NAID)
  • Text Lang
  • Article Type
    Journal Article
  • ISSN
  • Data Source
    CJP  CJPref  NII-ELS 
Page Top