Energy efficient design for multiuser downlink energy and uplink information transfer in 5G  

作　　者：Chunguo LI Yanshan LI Kang SONG Luxi YANG 

机构地区：[1]Key Laboratory of Underwater Acoustic Signal Processing of Ministry of Education, Southeast University [2]ATR National Key Laboratory of Defense Technology, Shenzhen University

出　　处：《Science China(Information Sciences)》2016年第2期70-77,共8页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China(973 Program)(Grant Nos.2012CB316004;2013CB336600);National Natural Science Foundation of China(Grant Nos.61201172;61372101;61221002);National High-tech R&D Program of China(863 Program)(Grant No.2014AA012104);Fundamental Research Funds for the Central Universities and Open Research Fund of Key Lab of Broadband Wireless Comm.and Sensor Network Tech.(NJUPT);Ministry of Education(Grant No.NYKL201502)

摘　　要：Simultaneous wireless information and power transfer（SWIPT） is studied in this paper for the wireless powered downlink（DL） and multiuser information uplink（UL） systems. The objective is to maximize the energy efficiency defined as the ratio of the achieved throughput over the energy cost by optimizing the time allocation for the DL and multi-user UL traffics and its goal is to obtain the analytical expression to the optimal time allocation yet the resulting difficulty comes from the sum throughput of the multiuser in UL as well as the corresponding power consumption. To tackle this, the Jensen inequality is applied to approximating the exact expression of the sum throughput for the UL multi-users, leading to an upper-bound of the counterpart.The final closed form is exact in the single-user scenario yet approximate in the multi-user scenario. Numerical simulations verify the tightness of this approximation and the performances of the proposed analytical scheme.Simultaneous wireless information and power transfer（SWIPT） is studied in this paper for the wireless powered downlink（DL） and multiuser information uplink（UL） systems. The objective is to maximize the energy efficiency defined as the ratio of the achieved throughput over the energy cost by optimizing the time allocation for the DL and multi-user UL traffics and its goal is to obtain the analytical expression to the optimal time allocation yet the resulting difficulty comes from the sum throughput of the multiuser in UL as well as the corresponding power consumption. To tackle this, the Jensen inequality is applied to approximating the exact expression of the sum throughput for the UL multi-users, leading to an upper-bound of the counterpart.The final closed form is exact in the single-user scenario yet approximate in the multi-user scenario. Numerical simulations verify the tightness of this approximation and the performances of the proposed analytical scheme.

关 键 词：energy harvest time allocation energy efficiency uplink multiuser throughput maximization analytical expression 

分 类 号：TN929.5[电子电信—通信与信息系统]