摘要
文中研究了在多用户多输入单输出(multiple-input single-output,MISO)无线能量传输系统,其中基站配备了N个天线用于无线地传输能量给多个单天线用户。为了降低实现成本,我们提出了一个恒包络模拟波束聚集方案,在多天线的发送端只需要一个单一的射频链来给多个用户传输能量。理论分析与实验结果均表明在均匀和独立的瑞利衰落的信道下,我们提出的恒包络模拟波束聚集方案与最优的可变包络数字波束聚集方案相比,只会导致约1 dB的功率损耗。但可变包络数字波束聚集方案中,每个发射天线都需要一个射频链,共需要N个射频链。
In this paper, we invested a multi-user wireless power transfer system in multiple-input single-output（MISO）. In this model, the base station equipped with N antennas needs to wirelessly transfer energy to multiple single-antenna users. In order to reduce the implementation cost, we proposed a constant-envelope analog beamforming scheme, in which only one single radio frequency（RF） chain is required in the multi-antenna transmitter to transfer power to all users. The theoretical analysis and numerical results show that under the homogeneous and independent Rayleigh fading channel, our proposed method of constant envelope beamforming is only about 1 dB of power loss compared with the optimal variable envelope digital beamforming scheme. However, variable envelope digital beamforming requires N RF chain, and each transmit antenna requires an RF chain.
作者
魏天伟
赵翔
WEI Tian-wei;ZHAO Xiang(Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;University of Chinese Academy of Sciences, Beijing 100049, China;ShanghaiTech University, Shanghai 201210, China)
出处
《电子设计工程》
2018年第7期91-95,100,共6页
Electronic Design Engineering
