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LDPC Decoding Algorithm for Multi-level Modulation Scheme  

Lee In-Ki (한국해양대학교 전파공학과 위성통신 연구실)
Jung Ji-Won (한국해양대학교 전파공학과 위성통신 연구실)
Choi Duk-Gun (한국해양대학교 전파공학과 위성통신 연구실)
Choi Ean-A (한국전자통신연구원 통신위성연구그룹)
Chang Dae-Ig (한국전자통신연구원 통신위성연구그룹)
Oh Duk-Gil (한국전자통신연구원 통신위성연구그룹)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.6C, 2005 , pp. 434-441 More about this Journal
Abstract
For LDPC decoding, received symbols are splitted bit by bit based using the received in-phase and quadrature components. The method of bit-splitting is affected on decoding performance because its method depend on distance over symbol constellation. Therefore this paper propose the bit split method using the sector information with sacrifice a little performance loss compared to Euclidean distance method. Futhermore DVB-S2 specification supports BC(Backward Compactible) mode which using the hierarchical modulation method, this paper also analyze the decoding performance according to deviation angle of 8PSK constellation for various LDPC coding rates.
Keywords
LDPC; DVB-S2; Multi-level Modulation Scheme; BC mode;
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