@article{a836a0d73ced43a0879ebff886e8264c,
title = "Impact of factor graph on average sum rate for uplink sparse code multiple access systems",
abstract = "In this paper, we first study the average sum rate of sparse code multiple access (SCMA) systems, where a general scenario is considered under the assumption that the distances between the mobile users and the base station are not necessarily identical. Closed-form analytical results are derived for the average sum rate based on which an optimal factor graph matrix is designed for maximizing the capacity of the SCMA systems. Moreover, we propose a low-complexity iterative algorithm to facilitate the design of the optimal graph matrix. Finally, Monte Carlo simulations are provided to corroborate the accuracy of the theoretical results and the efficiency of the proposed iterative algorithm.",
keywords = "average sum rate, Multiple access, optimal factor graph",
author = "Zheng Yang and Jingjing Cui and Xianfu Lei and Zhiguo Ding and Pingzhi Fan and Dageng Chen",
note = "Funding Information: This work of Z. Yang, J. Cui, X. Lei, P. Fan, and D. Chen was supported in part by the Huawei HIRP Flagship Project and in part by the National Science and Technology Major Project under Grant 2016ZX03001018-002. The work of X. Lei was supported by the National Science Foundation of China under Grant 61501382 and in part by the Fundamental Research Funds for the Central Universities under Grant 2682015RC20. The work of Z. Ding was supported by the UK EPSRC under Grant EP/L025272/1 and in part by the Royal Society International Exchange Scheme. Publisher Copyright: {\textcopyright} 2013 IEEE.",
year = "2016",
doi = "10.1109/ACCESS.2016.2614330",
language = "British English",
volume = "4",
pages = "6585--6590",
journal = "IEEE Access",
issn = "2169-3536",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
}