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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Proceedings ArticleDOI
Adaptive variable-length feedback using wireless power transfer for opportunistic beamforming
TL;DR: Two fundamental architectures for the combination of the rectenna elements, the direct-current combiner and the radio-frequency combiner, as well as a hybrid architecture of these two are studied.
Book ChapterDOI
Introduction to Wireless Powered Communication Network
Abbas Jamalipour,Ying Bi +1 more
TL;DR: This chapter provides an overview of the WPCNs by introducing the background of WPT, followed by a summary of the research conducted in the field, and describes the physical-layer security (PLS) problem in W PCNs, including the causes and the impacts of the problem on the performance of WPCN.
Proceedings ArticleDOI
Optimized Wireless Energy Harvesting Sensor Network with Backscatter Communication and Beamforming
TL;DR: This paper formulates and solves a joint-optimization problem whose objective is to maximize the sum-throughput of a wireless powered communication network (WPCN) with radio frequency energy harvesting and backscatter communication using a beamforming hybrid access point using a new multi-sensor blind adaptive beamforming with combination protocol (MS-BABF/combo).
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Energy-Efficient Online Data Sensing and Processing in Wireless Powered Edge Computing Systems
TL;DR: In this paper , a Lyapunov optimization-based online algorithm named LEESE was proposed to solve the problem of maximizing the long-term average data sensing rate of the WDs while maintaining task data queue stability under an average power constraint of the HAP.
Journal ArticleDOI
Optimal SIC Decoding Order and WPT Time Length for WPCN With Imperfect SIC
TL;DR: Numerical results show that the decoding order is relevant for spectral efficiency maximization when imperfect SIC is assumed and the proposed low-complexity solution shows a quasi-optimal performance.
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MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer
Rui Zhang,Chin Keong Ho +1 more
TL;DR: This paper studies a multiple-input multiple-output (MIMO) wireless broadcast system consisting of three nodes, where one receiver harvests energy and another receiver decodes information separately from the signals sent by a common transmitter, and all the transmitter and receivers may be equipped with multiple antennas.
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Xun Zhou,Rui Zhang,Chin Keong Ho +2 more
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