1 research outputs found
Throughput Optimization of Intelligent Reflecting Surface Assisted User Cooperation in WPCNs
Intelligent reflecting surface (IRS) can effectively enhance the energy and
spectral efficiency of wireless communication system through the use of a large
number of lowcost passive reflecting elements. In this paper, we investigate
throughput optimization of IRS-assisted user cooperation in a wireless powered
communication network (WPCN), where the two WDs harvest wireless energy and
transmit information to a common hybrid access point (HAP). In particular, the
two WDs first exchange their independent information with each other and then
form a virtual antenna array to transmit jointly to the HAP. We aim to maximize
the common (minimum) throughput performance by jointly optimizing the transmit
time and power allocations of the two WDs on wireless energy and information
transmissions and the passive array coefficients on reflecting the wireless
energy and information signals. By comparing with some existing benchmark
schemes, our results show that the proposed IRS-assisted user cooperation
method can effectively improve the throughput performance of cooperative
transmission in WPCNs.Comment: The paper has been accepted by Proc. IEEE VTC 2020 Fal