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Optimisation design of systematic LT codes over AWGN multiple access channel.

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Title: Optimisation design of systematic LT codes over AWGN multiple access channel.
Authors: Dachun Deng1,2, Dazhuan Xu1,2, Shengkai Xu1,2
Source: IET Communications (Wiley-Blackwell). 2018, Vol. 12 Issue 12, p1351-1359. 9p. 1 Chart, 10 Graphs.
Subjects: Luby transform codes, Additive white Gaussian noise channels, Multiple access protocols (Computer network protocols), Bit error rate, Mathematical optimization
Abstract: Systematic Luby transform (SLT) codes over the additive white Gaussian noise (AWGN) multiple access channels (MACs) are analysed in this study. The authors introduce a novel optimisation model extending from the point-to-point AWGN channels to design the degree distributions over the AWGN MACs, which dramatically improve the bit-error-rate (BER) performance of SLT codes. First, they extend the Gaussian approximation analysis of SLT codes to the AWGN MACs to analyse the asymptotic BER performance where the symmetric condition of log-likelihood ratio message can no longer be assumed. Second, based on the asymptotic BER analysis over the AWGN MACs, they extend the existing optimisation model from the point-to-point AWGN channels to the AWGN MACs. Simulation results show that the degree distributions obtained in this study outperform other common degree distributions (optimised for single-user AWGN channels) over the two-user AWGN MACs. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Systematic Luby transform (SLT) codes over the additive white Gaussian noise (AWGN) multiple access channels (MACs) are analysed in this study. The authors introduce a novel optimisation model extending from the point-to-point AWGN channels to design the degree distributions over the AWGN MACs, which dramatically improve the bit-error-rate (BER) performance of SLT codes. First, they extend the Gaussian approximation analysis of SLT codes to the AWGN MACs to analyse the asymptotic BER performance where the symmetric condition of log-likelihood ratio message can no longer be assumed. Second, based on the asymptotic BER analysis over the AWGN MACs, they extend the existing optimisation model from the point-to-point AWGN channels to the AWGN MACs. Simulation results show that the degree distributions obtained in this study outperform other common degree distributions (optimised for single-user AWGN channels) over the two-user AWGN MACs. [ABSTRACT FROM AUTHOR]
ISSN:17518628
DOI:10.1049/iet-com.2017.1063