Dang, K., Ngo, T. and Nguyen, N. 2020. Performance of non-orthogonal multiple access downlink system using the Log-Likelihood ratio. Science & Technology Development Journal: Natural Sciences. 4, 3 (Aug. 2020), 621-632. DOI:https://doi.org/https://doi.org/10.32508/stdjns.v4i3.662.