Improvement of turbo decoding using cross-entropy

Authors:
Erl-Huei Lu;Yi-Nan Lin;Wei-Wen Hung
Affiliations:
Department of Electronic Engineering, Chang Gung University, Taoyuan, Taiwan;Department of Electronic Engineering, Chang Gung University, Taoyuan, Taiwan and Department of Electronic Engineering, MingChi University of Technology, Taishan, Taiwan;Department of Electronic Engineering, MingChi University of Technology, Taishan, Taiwan
Venue:
Computer Communications
Year:
2009

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IEEE Transactions on Information Theory

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Abstract

In this paper, we present a simple method for normalizing the output information produced by a turbo decoder. The method is devised based on the cross-entropy (CE) concept. Simulations comparing the new method with some widely used normalization techniques show that the proposed approach can achieve about 0.2~0.3dB coding gain improvement on average while reducing up to about 1/2~2/3 iteration for decoding, but require much fewer and simpler computations.