Energy Efficiency Maximization for Cooperative NOMA with Hardware Impairments  

作　　者：Wang Zhengqiang Chang Ruifei Wan Xiaoyu Fan Zifu Duo Bin 

机构地区：[1]School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China [2]College of Computer Science and Cyber Security,Chengdu University of Technology,Chengdu 610059,China

出　　处：《China Communications》2024年第12期80-91,共12页中国通信（英文版）

基　　金：partially supported by the National Natural Science Foundation of China under Grant 61701064;Chongqing Natural Science Foundation under Grant cstc2019jcyj-msxmX0264;Sichuan Science and Technology Program under Grant 2022YFQ0017。

摘　　要：The massive connectivity and limited energy pose significant challenges to deploy the enormous devices in energy-efficient and environmentally friendly in the Internet of Things(IoT).Motivated by these challenges,this paper investigates the energy efficiency(EE)maximization problem for downlink cooperative non-orthogonal multiple access(C-NOMA)systems with hardware impairments(HIs).The base station(BS)communicates with several users via a half-duplex(HD)amplified-and-forward(AF)relay.First,we formulate the EE maximization problem of the system under HIs by jointly optimizing transmit power and power allocated coefficient(PAC)at BS,and transmit power at the relay.The original EE maximization problem is a non-convex problem,which is challenging to give the optimal solution directly.First,we use fractional programming to convert the EE maximization problem as a series of subtraction form subproblems.Then,variable substitution and block coordinate descent(BCD)method are used to handle the sub-problems.Next,a resource allocation algorithm is proposed to maximize the EE of the systems.Finally,simulation results show that the proposed algorithm outperforms the downlink cooperative orthogonal multiple access(C-OMA)scheme.

关 键 词：block coordinate descent cooperative non-orthogonal multiple access energy efficiency hardware impairments resource allocation 

分 类 号：TN929.5[电子电信—通信与信息系统]