Energy Efficiency and Spectral-Efficiency Tradeoff in Downlink NOMA Systems

被引:0
作者
Liu, Qian [1 ]
Tan, Fangqing [1 ]
Lv, Tiejun [1 ]
Gao, Hui [1 ]
机构
[1] Beijing Univ Posts & Telecommun, Sch Informat & Commun Engn, Key Lab Trustworthy Distributed Comp & Serv, Minist Educ, Beijing 100876, Peoples R China
来源
2017 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS WORKSHOPS (ICC WORKSHOPS) | 2017年
基金
中国国家自然科学基金;
关键词
NONORTHOGONAL MULTIPLE-ACCESS; ALLOCATION;
D O I
暂无
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Non-orthogonal multiple access (NOMA) has been investigated recently as a candidate radio access technology for the fifth generation (5G) mobile communication due to its high spectral efficiency (SE). Green radio (GR) which focuses on energy efficiency (EE) is becoming an inevitable trend. In this paper, we study the tradeoff between EE and SE in downlink NOMA systems. The tradeoff problem is formulated as an optimization problem in which the basic idea is to maximize EE under a satisfying minimum SE requirement. It is proved that the system EE is a strictly quasi-concave function of transmission power. By formulating the optimization problem as a bilayer optimization problem, the optimal solution to the optimization problem is obtained, including optimal power allocation coefficients among multiplexed users and optimal transmission power value. Simulation results are provided to further confirm our theoretical findings and the effectiveness of our proposed power allocation scheme for achieving a flexible tradeoff between EE and SE.
引用
收藏
页码:247 / 252
页数:6
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