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Paper Abstract and Keywords
Presentation 2005-05-27 10:10
A Study of Reliability Based Hybrid ARQ Scheme with Bitwise Posterior Probability Evaluation from Message Passing Algorithm
Daiki Koizumi, Naoto Kobayashi, Toshiyasu Matsushima, Shigeichi Hirasawa (Waseda Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) Reliability Based Hybrid ARQ (RBH-ARQ) is one of hybrid ARQ schemes with the modified decision feedback. In RBH-ARQ, the modified feedback is composed of both ACK/NAK signal and unreliable bit index which is evaluated from bitwise posterior probability.
In the conventional RB-ARQ, the sender retransmits just unreliable information bits with no coding when unreliable bits are detected on the receiver and retransmission occurs. In the proposed RBH-ARQ, on the other hand, the sender retransmits not information bits but newly encoded parity bits corresponding to the unreliable information bits assuming systematic convolutional coding. Furthermore, the proposed scheme assumes message passing algorithm for Maximum A Posteriori probability (MAP) decoding on the receiver. The receiver puts received bits including retransmitted parity bits all together into our proposing probability model. As a result, better performance can be expected in the proposed RBH-ARQ since our probability model is similar to the celebrated decoding model of multiple Turbo codes. Finally, brief simulation results based on several message passing schedules in our algorithm would be shown.
Keyword (in Japanese) (See Japanese page) 
(in English) Reliability Based Hybrid ARQ / Bitwise MAP Decoding / Message Passing Algorithm / / / / /  
Reference Info. IEICE Tech. Rep., vol. 105, no. 85, IT2005-24, pp. 11-16, May 2005.
Paper # IT2005-24 
Date of Issue 2005-05-20 (IT) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee IT  
Conference Date 2005-05-25 - 2005-05-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Univ. of Hawaii 
Topics (in Japanese) (See Japanese page) 
Topics (in English) general 
Paper Information
Registration To IT 
Conference Code 2005-05-IT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study of Reliability Based Hybrid ARQ Scheme with Bitwise Posterior Probability Evaluation from Message Passing Algorithm 
Sub Title (in English)  
Keyword(1) Reliability Based Hybrid ARQ  
Keyword(2) Bitwise MAP Decoding  
Keyword(3) Message Passing Algorithm  
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1st Author's Name Daiki Koizumi  
1st Author's Affiliation Waseda University (Waseda Univ.)
2nd Author's Name Naoto Kobayashi  
2nd Author's Affiliation Waseda University (Waseda Univ.)
3rd Author's Name Toshiyasu Matsushima  
3rd Author's Affiliation Waseda University (Waseda Univ.)
4th Author's Name Shigeichi Hirasawa  
4th Author's Affiliation Waseda University (Waseda Univ.)
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Speaker Author-1 
Date Time 2005-05-27 10:10:00 
Presentation Time 20 minutes 
Registration for IT 
Paper # IT2005-24 
Volume (vol) vol.105 
Number (no) no.85 
Page pp.11-16 
#Pages
Date of Issue 2005-05-20 (IT) 


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