无线供能的多输入单输出非正交多址接入传输方案设计  

Design of Wireless-Powered MISO-NOMA System

作　　者：邓萍 吴伟 茅晨 朱启文[3] Deng Ping;Wu Wei;Mao Cheng;Zhu Qiwen(Schoolof Telecommunications&Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing210003,China;School of Automation&Artificial Intelligence,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;Engineering Research and Development Center,Nanjing College of Information Technology,Nanjing 210023,China)

机构地区：[1]南京邮电大学自动化学院、人工智能学院,南京210003 [2]南京邮电大学通信与信息工程学院,南京210003 [3]南京信息职业技术学院工程研发中心,南京210023

出　　处：《信息化研究》2019年第5期18-22,共5页INFORMATIZATION RESEARCH

基　　金：国家自然科学基金项目(61901231)

摘　　要：文章研究了通过无线供能的多输入单输出非正交多址接入系统。能量受限的全双工无线设备收集来自能量发送端和回环信道的无线信号能量,发送经叠加编码的信号给下行用户;通过能量波束成形和信息波束成形的联合优化,抑制同频传输的能量信号对用户接收信息的干扰,实现能量发送端能耗的最小;通过半正定松弛方法得到该非凸优化问题的最优解,并通过最优解秩为1的证明保证了半正定松弛的紧性。此外,文章还提出了一种基于干扰置零的次优波束设计方案。This paper investigated a wireless-powered multiple input single-output non-orthogonal multiple access downlink system, where the energy-constrained full-duplex wireless device harvests energy from a dedicated energy transmitter and its loop channel, and transmits the superposition coded signal to the downlink users. To depress the interference of the energy signal to information signal, a jointly optimization of the energy beamforming and the information beamforming is adopted to minimize transmission power of the energy transmitter. The technique of semi-definition relaxation applied to solve the nonconvex optimization problem and the optimal solution is obtained. Furthermore, the tightness of the semi-definition relaxation is proved by showing the existence of the rank-one optimal solution. Besides, a suboptimal solution based on interference-nulling is also proposed.

关 键 词：非正交多址接入 收集能量 干扰置零 全双工 

分 类 号：TN929.5[电子电信—通信与信息系统]