摘要
对于包含一个多天线能量发射基站、多个用户和一个信息接收机的非正交多址接入网络,网络的工作过程分为下行无线能量传输和上行信息传输两个阶段。在下行能量传输阶段,能量发射基站向用户传输无线能量;在上行信息传输阶段,用户使用收集到的能量并采用非正交多址接入方式向信息接收机发送信息。当用户的初始能量较小以至于无法支持通信需求时,无线能量传输阶段将开启。针对无线能量传输是否开启的条件,通过联合优化上行下行两个阶段的时间分配、能量发射机的能量协方差矩阵以及用户信息传输的发射功率来最大化上行信息传输的吞吐量,并使用拉格朗日乘数法求出了涉及优化问题的最优闭式解。仿真结果表明,与基准策略相比,所提出的算法具有更好的吞吐量性能。
This paper considers a non-orthogonal multiple access(NOMA)network consisting of a multi-antenna base station,multiple users and an information receiver.The working process of the network can be divided into two phases,namely downlink wireless power transfer phase and uplink information transmission phase.In the downlink wireless power transfer phase,the base station transfers power wirelessly to the users,and in the uplink information transmission phase,the users use their harvested energy to transmit information to the information receiver in a NOMA manner.When the user s initial energy is low and thus cannot support its communication requirement,the wireless power transfer phase will be activated.We investigate the activation condition of the wireless power transfer phase.Furthermore,to maximize the throughput of uplink information transmission,we jointly optimize the time allocation between the downlink and uplink,the energy covariance matrix of wireless power transfer at the base station and transmit power of the users.Based on the Lagrangian multiplier method,we propose an optimal algorithm to find the solution to the considered problem in closed-form.Simulation results show that the proposed algorithm achieves much higher throughput performance than some benchmark schemes.
作者
曾志超
崔苗
林凡
张磊
胡涵飞
张广驰
ZENG Zhichao;CUI Miao;LIN Fan;ZHANG Lei;HU Hanfei;ZHANG Guangchi(School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China;Guangzhou GCI Science&Technology Co,Ltd,Guangzhou 510310,China;No.54 Research Institute of China Electronics Technology Group Cooperation,Shijiazhuang 050081,China;No.7 Research Institute of China Electronics Technology Group Cooperation,Guangzhou 510310,China)
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第6期104-110,共7页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金(61571138)
广东省科技计划项目(2017B090909006,2018A050506015)
广州市科技计划项目(201904010371)
关键词
非正交多址接入
无线供电通信网络
开启条件
吞吐量
资源分配
non-orthogonal multiple access
wireless powered communication networks
activate condition
throughput
resource allocation
