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
Utility-Optimal Resource Allocation in Energy Harvesting Powered C-RAN
TL;DR: A general system utility optimization framework is proposed for the design of coordinated beamforming and power splitting algorithm based on Lyapunov optimization theory and performance analysis demonstrate that the proposed algorithm can achieve close-to-optimal system utility.
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Access Mechanism in Wireless Powered Communication Networks With Harvesting Access Point
TL;DR: A new distributed medium access control (MAC) mechanism in a relay WPCN, based on carrier sense multiple access with collision avoidance, a binary exponential random backoff mechanism is proposed, which shows the effectiveness of the proposed MAC in terms of throughput and energy efficiency.
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Time domain spectrum sharing with wireless power transfer in cognitive radio network
Zhiyuan Yu,Chao Zhai,Ju Liu +2 more
TL;DR: This work proposes a time-domain spectrum sharing scheme based on the wireless energy transfer (WET) for the cognitive radio network with one primary link and one secondary link and analyzes the throughput of both systems under the peak power constraint.
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Throughput maximization in wireless powered communication networks with minimum node throughput requirement
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Energy-Efficient Resource Allocation for Wireless Power Transfer Enabled Massive MIMO Systems with Hardware Impairments
TL;DR: An energy efficient resource allocation algorithm that combines time and power allocation is proposed to maximize the energy efficiency of the systems.
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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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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