Optimal Time Scheduling for Wireless-Powered Backscatter Communication Networks

Nguyen Van Huynh, Dinh Thai Hoang, Dusit Niyato, Ping Wang, Dong In Kim
2018 IEEE Wireless Communications Letters  
In this paper, 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 harvestthen-transmit (HTT), and they can cooperate to deliver the information to the access point. To improve energy transmission efficiency for the
more » ... iency for the devices, energy beamforming is deployed at the power beacon. We then formulate the weighted sum-rate (WSR) 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 (SDR) techniques to obtain the optimal solution. Simulation results show that the proposed cooperation framework can improve up to 33% communication efficiency compared with non-cooperation approach.
doi:10.1109/lwc.2018.2827983 fatcat:dljdnt7dzbhd5m4yyqclq6dxne