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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Energy efficiency optimization-based resource allocation for underlay RF-CRN with residual energy and QoS guarantee
TL;DR: Simulation results show that the proposed strategy has fast convergence and can improve the system EE greatly while ensuring the QoS and a quick iterative algorithm based on Dinkelbach's method is proposed to achieve the optimal resource allocation.
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Characterization of Energy Availability in RF Energy Harvesting Networks
TL;DR: The proposed analysis characterizes the distribution of the RF power received by an energy harvester node and derives the probability of a node having enough energy to transmit a packet after a given amount of charging time, validated through simulation.
Proceedings ArticleDOI
Energy-Efficient Resource Allocation for Energy Harvesting-Powered D2D Communications Underlaying Cellular Networks
TL;DR: An iterative resource allocation scheme based on the Dinkelbach method is proposed to solve the formulated nonconvex optimization problem to maximize the energy efficiency of D2D communications via joint time allocation and power control while satisfying the quality of service requirement of cellular user (CU) and energy causality constraint.
Posted Content
Wireless Information and Power Transfer: Nonlinearity, Waveform Design and Rate-Energy Tradeoff
TL;DR: In this article, a tractable model of the rectifier nonlinearity was developed to cope with general multicarrier modulated input waveforms, and the superposition of multi-carrier unmodulated and modulated waveforms at the transmitter was proposed.
Proceedings ArticleDOI
SWIPT-aided uplink in hybrid non-orthogonal multiple access
TL;DR: It is clear from the results that wireless power transfer can be used successfully in uplink NOMA transmission in case when the users are running out of power, providing successful communication between users and the source.
References
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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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Journal ArticleDOI
Wireless Information and Power Transfer: Architecture Design and Rate-Energy Tradeoff
Xun Zhou,Rui Zhang,Chin Keong Ho +2 more
TL;DR: A general receiver operation, namely, dynamic power splitting (DPS), which splits the received signal with adjustable power ratio for energy harvesting and information decoding, separately is proposed and the optimal transmission strategy is derived to achieve different rate-energy tradeoffs.
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Multiaccess fading channels. I. Polymatroid structure, optimal resource allocation and throughput capacities
David Tse,Stephen V. Hanly +1 more
TL;DR: This work focuses on the multiaccess fading channel with Gaussian noise, and defines two notions of capacity depending on whether the traffic is delay-sensitive or not, and characterize the throughput capacity region which contains the long-term achievable rates through the time-varying channel.
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