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Channel Coding Algorithm using Absolute Mean Values for the Difference Values of Soft Output in Digital Mobile Communication System  

Jeong, Dae-Ho (Department of Electrical Electronic and Information Engineering, Wonkwang University)
Kim, Hwan-Yong (Department of Electrical Electronic and Information Engineering, Wonkwang University)
Lim, Soon-Ja (Department of Electrical Electronic and Information Engineering, Wonkwang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.44, no.10, 2007 , pp. 67-74 More about this Journal
Abstract
Turbo code, a kind of channel coding technique, has ben used in the field of digital mobile communication system if the number of iterations is increased in the several channel environments, my further iteration results in very little improvement, and requires much delay and computation in proportion to the number of iterations. In this paper, it proposes an efficient stopping rules for the iteration process in turbo decoding. By using absolute mean values for the LLR difference values between the first and second decoder in the present decoding process, the proposed algorithm can largely reduce the average number of iterations without BER performance degradation in all SNR regions. As a result of simulation, the average number of iterations of proposed algorithm is reduced by about $18.25%{\sim}20.58%$ compared to SDR algerian in the lower SNR region, and is reduced by about $22.96%{\sim}28.74%$ compared to method using variance values of extrinsic information in the upper SNR region.
Keywords
Turbo Code; Iterative Decoding; Stopping Criterion; Difference Values; Mean Values;
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