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Wireless Information and Power Transfer Design for Energy Cooperation Distributed Antenna Systems

Yuan, F; Jin, S; Wong, K-K; Zhao, J; Zhu, H; (2017) Wireless Information and Power Transfer Design for Energy Cooperation Distributed Antenna Systems. IEEE Access , 5 pp. 8094-8105. 10.1109/ACCESS.2017.2682922. Green open access

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Abstract

Distributed antenna systems (DASs) have been widely implemented in the state-of-the-art cellular communication systems to cover dead spots. Recent studies have also indicated that DAS has advantages in wireless energy transfer (WET). In this paper, we study simultaneous wireless information and power transfer for a multiple-input single-output DAS in the downlink, which consists of arbitrarily distributed remote antenna units (RAUs). In order to save the energy cost, we adopt the energy cooperation of energy harvesting (EH) and two-way energy flows to let the RAUs trade their harvested energy through the smart grid network. Under individual EH constraints, per-RAU power constraints, and various smart grid considerations, we investigate a power management strategy that determines how to utilize the stochastically spatially distributed harvested energy at the RAUs and how to trade the energy with the smart grid simultaneously to supply maximum wireless information transfer (WIT) with a minimum WET constraint for a receiver adopting power splitting. Our analysis shows that the optimal design can be achieved in two steps. The first step is to maximize a new objective that can simultaneously maximize both WET and WIT, considering both the smart grid profitable and smart grid neutral cases. For the grid-profitable case, we derive the optimal full power strategy and provide a closed-form result to see under what condition this strategy is used. On the other hand, for the grid-neutral case, we illustrate that the optimal power policy has a double-threshold structure and present an optimal allocation strategy. The second step is then to solve the whole problem by obtaining the splitting power ratio based on the minimum WET constraint. Simulation results are provided to evaluate the performance under various settings and characterize the double-threshold structure.

Type: Article
Title: Wireless Information and Power Transfer Design for Energy Cooperation Distributed Antenna Systems
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/ACCESS.2017.2682922
Publisher version: http://doi.org/10.1109/ACCESS.2017.2682922
Language: English
Additional information: Open Access Article. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Energy harvesting, distributed antennas, simultaneous wireless information and power transfer, smart grid
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1565063
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