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http://dx.doi.org/10.6109/jkiice.2008.12.9.1654

Bit Split Algorithm for Applying the Multilevel Modulation of Iterative codes  

Park, Tae-Doo (한국해양대학교 전파공학과)
Kim, Min-Hyuk (한국해양대학교 전파공학과)
Kim, Nam-Soo (한국해양대학교 전파공학과)
Jung, Ji-Won (한국해양대학교 전파공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.12, no.9, 2008 , pp. 1654-1665 More about this Journal
Abstract
This paper presents bit splitting methods to apply multilevel modulation to iterative codes such as turbo code, low density parity check code and turbo product code. Log-likelihood ratio method splits multilevel symbols to soft decision symbols using the received in-phase and quadrature component based on Gaussian approximation. However it is too complicate to calculate and to implement hardware due to exponential and logarithm calculation. Therefore this paper presents Euclidean, MAX, sector and center focusing method to reduce the high complexity of LLR method. Also, this paper proposes optimal soft symbol split method for three kind of iterative codes. Futhermore, 16-APSK modulator method with double ring structure for applying DVB-S2 system and 16-QAM modulator method with lattice structure for T-DMB system are also analyzed.
Keywords
turbo code; low density parity check code; turbo product code; log-likelihood ratio;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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