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IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 2007 E90-A(9):1736-1744; doi:10.1093/ietfec/e90-a.9.1736
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Copyright © 2007 The Institute of Electronics, Information and Communication Engineers

Special Section on Information Theory and Its Applications -- Papers

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

Daiki KOIZUMI1,5, Naoto KOBAYASHI2, Toshiyasu MATSUSHIMA3 and Shigeichi HIRASAWA4

1 The author is with the Graduate School of Science and Engineering, Waseda University, Tokyo, 169-8555 Japan. E-mail: dkoizumi{at}m.ieice.org, 2 The author is with Media Network Center, Waseda University, Tokyo, 169-8050 Japan., 3 The author is with the Department of Applied Mathematics, School of Fundamental Science and Engineering, Waseda University, Tokyo, 169-8555 Japan., 4 The author is with the Department of Industrial and Management Systems Engineering, School of Creative Science and Engineering, Waseda University, Tokyo, 169-8555 Japan., 5 Presently, with the Research Institute for Science and Engineering, Waseda University.


  Abstract

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.

Key Words: reliability-based hybrid ARQ, bitwise MAP decoding, message passing algorithm

Manuscript received December 21, 2006. Manuscript revised April 2, 2007. Final manuscript received May 28, 2007.


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