%0 Journal Article
%A $authorName.trim()
%T Power allocation scheme for maximizing spectrum efficiency and energy efficiency tradeoff for multi-cluster NOMA system
%D 2020
%R 10.19682/j.cnki.1005-8885.2020.0017
%J Journal of China Universities of Posts and Telecommunications
%P 62-72
%V 27
%N 3
%X In this paper, a power allocation to maximize tradeoff between spectrum efficiency (SE) and energy efficiency
(EE) is considered for the downlink non-orthogonal multiple access (NOMA) system with arbitrarily clusters and arbitrarily users, where the subcarriers of clusters are mutually orthogonal to each other. Specifically, an optimization problem of maximizing SE-EE tradeoff is formulated by optimizing power allocation among users under the constraints of user rate requirements. Then, the optimization problem is decomposed into a group of sub-problems with the aim of maximizing SE-EE tradeoff for each cluster, which is solved by using bisection method and monotonicity of function. Finally, the power allocation optimization problem among users is transformed into that between clusters, and a two steps inter-cluster power allocation algorithm is developed to solve this problem. Simulation results show that SE-EE tradeoff of the proposed scheme is better than that of the existing schemes.
%U https://jcupt.bupt.edu.cn/EN/10.19682/j.cnki.1005-8885.2020.0017