User Cooperation in Wireless-Powered Backscatter Communication Networks

被引：43

作者：

Lyu, Bin ^{[1
]}

Dinh Thai Hoang ^{[2
]}

Yang, Zhen ^{[1
]}

机构：

[1] Nanjing Univ Posts & Telecommun, Natl Engn Res Ctr Commun & Network Technol, Nanjing 210003, Jiangsu, Peoples R China

[2] Univ Technol Sydney, Fac Engn & Informat Technol, Sydney, NSW 2007, Australia

来源：

IEEE WIRELESS COMMUNICATIONS LETTERS | 2019年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Energy harvesting; backscatter communication; user cooperation; energy beamforming; OPTIMAL RESOURCE-ALLOCATION;

D O I：

10.1109/LWC.2018.2890642

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

In this letter, we introduce new user-cooperation schemes for wireless devices in a wireless-powered backscatter communication network with the aim to improve communication and energy efficiency for the whole network. In particular, we consider two types of wireless devices which can support different communication modes, i.e., backscatter and harvest-then-transmit, and they can cooperate to deliver the information to the access point. To improve energy transmission efficiency for the devices, energy beamforming is deployed at the power beacon. We then formulate the weighted sum-rate maximization problem by jointly optimizing time schedule, power allocation, and energy beamforming. Due to the non-convex issue of the optimization problem, we employ the variable substitutions and semidefinite relaxation techniques to obtain the optimal solution. Simulation results show that the proposed cooperation framework can significantly improve the communication efficiency compared with non-cooperation approach.

引用

页码：632 / 635

页数：4

共 14 条

[1] BackFi: High Throughput WiFi Backscatter [J].