中国邮电高校学报(英文版) ›› 2020, Vol. 27 ›› Issue (3): 62-72.doi: 10.19682/j.cnki.1005-8885.2020.0017

• Wireless • 上一篇    下一篇

Power allocation scheme for maximizing spectrum efficiency and energy efficiency tradeoff for multi-cluster NOMA system

李亚1,张丹青1,田心记1,   

  1. 1. 河南理工大学
    2. 黄河科技学院
  • 收稿日期:2020-01-03 修回日期:2020-04-21 出版日期:2020-06-24 发布日期:2020-08-30
  • 通讯作者: 田心记 E-mail:tian215216@sohu.com
  • 基金资助:
    基于MIMO技术的超密集网络分层干扰消除技术研究

Power allocation scheme for maximizing spectrum efficiency and energy efficiency tradeoff for multi-cluster NOMA system

  • Received:2020-01-03 Revised:2020-04-21 Online:2020-06-24 Published:2020-08-30
  • Contact: Xin-Ji TIAN E-mail:tian215216@sohu.com

摘要: 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.

关键词: NOMA, power allocation, spectrum efficiency, energy efficiency, tradeoff

Abstract: 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.

Key words: NOMA, power allocation, spectrum efficiency, energy efficiency, tradeoff