Title :
Simplified LLR calculation for DVB-S2 LDPC decoder
Author :
Vanessa B. Olivatto;Renato R. Lopes;Eduardo R. de Lima
Author_Institution :
Department of Hardware Design Eldorado Research Institute, Campinas, Brazil, School of Electrical and Computer Engineering University of Campinas, Campinas, Brazil
Abstract :
The computation of the Log-Likelihood Ratio (LLR) at the channel output may impose great demand of memory and hardware area, especially for high-order modulations. This paper introduces a new approach for the approximation of the LLR in AWGN channels based on the splitting of the original constellation into smaller sectors. Each new sector has a less complex configuration in which it is possible to take into account only two symbols besides the received one. The proposed solution is applied for the 8-PSK and 16-APSK constellations adopted in the Digital Video for Satellite Second Generation standard (DVBS2).
Keywords :
"Parity check codes","Modulation","Satellites","Conferences","Hardware","Decoding","Mathematical model"
Conference_Titel :
Communication, Networks and Satellite (COMNESTAT), 2015 IEEE International Conference on
DOI :
10.1109/COMNETSAT.2015.7434300
