Abstract
This paper studies optimal resource allocation in the wireless powered communication networks (WPCN) combined with time reversal (TR) in which one hybrid access point (H-AP) broadcasts constant wireless energy to a set of distributed users in the downlink (DL) and receives information from the users via space division multiple access (SDMA) in the uplink (UL). Inevitable interferences will occur when users transmit information in the UL simultaneously and the special space-time focusing of TR is used to suppress the interferences. An efficient protocol is proposed to support wireless energy transfer (WET) and TR in the DL and wireless information transmission in the UL for the proposed TR-WPCN. We optimize the time allocations to the H-AP for DL WET, DL TR, and UL WIT to maximize the sum throughput. Due to the nonconvexity of the studied optimization problem, we optimize variables successively, where the nonconvex optimization problem is transformed into the convex optimization problem. The approximate convex optimization problem can then be solved iteratively combined with the dichotomy method. Simulation results show that the proposed scheme can effectively suppress interferences and improve system performance.
Highlights
With the rapid development of wireless communication network and the rapid growth of the number of wireless terminals access to the network, a large number of Internet of ings (IoT) devices represented by sensor nodes will exist in future wireless communication systems. us, how to provide stable and continuous power supply for these ubiquitous devices is an urgent problem to be solved for IoT
Simultaneous wireless information and power transfer (SWIPT) [1, 2] and wireless powered communication networks (WPCN) [3, 4] are the main methodologies for energy harvesting (EH) in wireless network
We studied a WPCN composed of an hybrid access point (H-AP) and N users
Summary
With the rapid development of wireless communication network and the rapid growth of the number of wireless terminals access to the network, a large number of Internet of ings (IoT) devices represented by sensor nodes will exist in future wireless communication systems. us, how to provide stable and continuous power supply for these ubiquitous devices is an urgent problem to be solved for IoT. In [6], a weighted throughput optimization problem was discussed for the two-node WPCN where energy can be purposely transferred from an energy-rich network node (e.g., an access point) to terminal devices. WPCN with heterogeneous nodes (nodes with and without energy harvesting capabilities) was studied, and the optimal solutions were proposed in [8, 9] to maximizing the sum throughput or maximizing the minimum throughput. Kang et al [12] investigated the sum-throughput maximization problem and the total time minimization problem for the proposed full-duplex wireless powered communication network. Aboelwafa et al [16] studied a generic scenario, in which the energy rich and access point do not coincide in WPCN with NOMA to optimize the sum throughput.
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