An Iterative Decoding Method of Updating Redundant Likelihood Information

Masayuki ARIYOSHI
Iwao SASASE

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.3    pp.1045-1053
Publication Date: 2005/03/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.3.1045
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
Keyword: 
turbo code,  iterative decoding,  redundant likelihood update,  soft-input RSC,  SISO encoder,  

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Summary: 
This paper presents a novel decoding algorithm for turbo codes, in which the likelihood values for redundant parts are updated in order for those values to become more reliable. A criterion for updating the redundant likelihood values is proposed, which is based on the comparisons of the channel values with the re-generated values by the soft-input and soft-output encoders. It is shown that the proposed method can improve the error correcting capabilities, i.e., the improvement of BER/BLER performance and the achievable BER limit.