Continuous BP Decoding Algorithm for a Low-Density Parity-Check Coded Hybrid ARQ System

Sangjoon PARK  Sooyong CHOI  Seung-Hoon HWANG  

IEICE TRANSACTIONS on Communications   Vol.E93-B    No.4    pp.993-996
Publication Date: 2010/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.993
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
low-density parity-check codes,  belief propagation decoding,  hybrid automatic repeat request,  

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A continuous belief propagation (BP) decoding algorithm for a hybrid automatic repeat request (ARQ) system is proposed in this paper. The proposed continuous BP decoding algorithm utilizes the extrinsic information generated in the last iteration of the previous transmission for a continuous progression of the decoding through retransmissions. This allows the continuous BP decoding algorithm to accelerate the decoding convergence for codeword determination, especially when the number of retransmissions is large or a currently combined packet has punctured nodes. Simulation results verify the effectiveness of the proposed continuous BP decoding algorithm.