Throughput Maximization in Wireless Powered Communication Networks
Hyungsik Ju,Rui Zhang +1 more
- Vol. 13, Iss: 1, pp 418-428
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TLDR
The solution reveals an interesting "doubly near-far" phenomenon due to both the DL and UL distance-dependent signal attenuation, where a far user from the H-AP, which receives less wireless energy than a nearer user in the DL, has to transmit with more power in the UL for reliable information transmission.Abstract:
This paper studies the newly emerging wireless powered communication network in which one hybrid access point (H-AP) with constant power supply coordinates the wireless energy/information transmissions to/from a set of distributed users that do not have other energy sources. A "harvest-then-transmit" protocol is proposed where all users first harvest the wireless energy broadcast by the H-AP in the downlink (DL) and then send their independent information to the H-AP in the uplink (UL) by time-division-multiple-access (TDMA). First, we study the sum-throughput maximization of all users by jointly optimizing the time allocation for the DL wireless power transfer versus the users' UL information transmissions given a total time constraint based on the users' DL and UL channels as well as their average harvested energy values. By applying convex optimization techniques, we obtain the closed-form expressions for the optimal time allocations to maximize the sum-throughput. Our solution reveals an interesting "doubly near-far" phenomenon due to both the DL and UL distance-dependent signal attenuation, where a far user from the H-AP, which receives less wireless energy than a nearer user in the DL, has to transmit with more power in the UL for reliable information transmission. As a result, the maximum sum-throughput is shown to be achieved by allocating substantially more time to the near users than the far users, thus resulting in unfair rate allocation among different users. To overcome this problem, we furthermore propose a new performance metric so-called common-throughput with the additional constraint that all users should be allocated with an equal rate regardless of their distances to the H-AP. We present an efficient algorithm to solve the common-throughput maximization problem. Simulation results demonstrate the effectiveness of the common-throughput approach for solving the new doubly near-far problem in wireless powered communication networks.read more
Citations
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Journal ArticleDOI
Resource Allocation in Wireless Powered IoT System: A Mean Field Stackelberg Game-Based Approach.
TL;DR: The resource allocation in the wireless powered IoT system, which includes one hybrid access point (HAP) and many wireless sensor nodes, is researched to obtain the optimal power level for information transmission and energy transfer simultaneously.
Journal ArticleDOI
Optimizing Joint Data and Power Transfer in Energy Harvesting Multiuser Wireless Networks
TL;DR: In this article, the authors proposed joint data and energy transfer optimization frameworks for powering mobile wireless devices through RF energy harvesting, where two types of harvesting capabilities are considered at each user: harvesting only from dedicated RF signals and hybrid harvesting from both dedicated and ambient RF signals.
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Joint beamforming optimisation for NOMA-based wireless powered multi-pair two-way AF and DF relaying networks
Chaozhu Zhang,Xinghua Jia +1 more
TL;DR: The authors propose two iterative algorithms to solve relay beamforming and power-domain non-orthogonal multiple access for the wireless powered MP-TWRN based on the difference of convex programming transformation and the successive convex approximation.
Journal ArticleDOI
Ocean Surface Drifting Buoy System Based on UAV-Enabled Wireless Powered Relay Network
TL;DR: An unmanned aerial vehicle (UAV)-enabled wireless powered relay network in which the UAV acts as mobile hybrid access point that broadcasts energy to all buoys in the downlink and forwards information from the buoys to a ship signal tower in the uplink is designed.
Journal ArticleDOI
Time Allocation and Optimization in UAV-Enabled Wireless Powered Communication Networks
TL;DR: In this article , the authors investigated the use of UAVs in wireless sensor networks as an energy transmitter and a data collector, where the UAV is first charged from a charging station, such as a base station (BS), before it flies to the sensors for data collection.
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