Optimization of Power Transfer Efficiency and Energy Efficiency for Wireless-Powered Systems With Massive MIMO

被引:75
|
作者
Khan, Talha Ahmed [1 ,2 ]
Yazdan, Ali [3 ]
Heath, Robert W., Jr. [1 ]
机构
[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
[2] Ericsson Res, Santa Clara, CA 95054 USA
[3] Facebook Inc, Menlo Pk, CA 94025 USA
关键词
Energy efficiency; power transfer efficiency; wireless power transfer; wireless-powered communications; massive MIMO; energy harvesting; wireless information and power transfer; RESOURCE-ALLOCATION; MULTIUSER MIMO; COMMUNICATION; DESIGN; INFORMATION;
D O I
10.1109/TWC.2018.2865727
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
Massive MIMO is attractive for wireless information and energy transfer due to its ability to focus energy toward desired spatial locations. In this paper, the overall power transfer efficiency (P'I'E) and the energy efficiency (EE) of a wirelessly powered massive MIMO system are investigated, where a multi-antenna base-station (BS) uses wireless energy transfer to charge single-antenna energy harvesting users on the downlink. The users may exploit the harvested energy to transmit information to the BS on the uplink. The overall system performance is analyzed while accounting for the nonlinear nature of practical energy harvesters. First, for wireless energy transfer, the PTE is characterized using a scalable model for the BS circuit power consumption. The PTE-optimal values for the number of BS antennas and users are derived. Then, for wireless energy and information transfer, the EE performance is characterized. The EE-optimal BS transmit power is derived in terms of the key system parameters, such as the number of BS antennas and the number of users. As the number of antennas becomes large, increasing the transmit power improves the EE for moderate to large number of antennas. Simulation results suggest that it is energy efficient to operate the system in the massive MIMO regime.
引用
收藏
页码:7159 / 7172
页数:14
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