Two Bit Quantization for Turbo Decoder Extrinsic Information with Parameter Reset

Do-Sik YOO  Jongtae LIM  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.8   pp.2727-2730
Publication Date: 2009/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2727
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
Keyword: 
turbo codes,  extrinsic information,  extrinsic memory,  quantization,  

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Summary: 
In this letter, we propose a two-bit representation method for turbo decoder extrinsic information based on bit error count minimization and parameter reset. We show that the performance of the proposed system approaches that of the full precision decoder within 0.17 dB and 0.48 dB at 1 % packet error rate for packet lengths of 500 and 10,000 information bits. The idea of parameter reset we introduce can be used not only in turbo decoder but also in many other iterative algorithms.