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Wireless Power Transfer in Massive MIMO-Aided HetNets with User Association

Zhu, Y; Wang, L; Wong, KK; Jin, S; Zheng, Z; (2016) Wireless Power Transfer in Massive MIMO-Aided HetNets with User Association. IEEE Transactions on Communications , 64 (10) pp. 4181-4195. 10.1109/TCOMM.2016.2594794. Green open access

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Abstract

This paper explores the potential of wireless power transfer (WPT) in massive multiple-input multiple-output (MIMO)-aided heterogeneous networks (HetNets), where massive MIMO is applied in the macrocells, and users aim to harvest as much energy as possible and reduce the uplink path loss for enhancing their information transfer. By addressing the impact of massive MIMO on the user association, we compare and analyze user association schemes: 1) downlink received signal power (DRSP)-based approach for maximizing the harvested energy and 2) uplink received signal power (URSP)-based approach for minimizing the uplink path loss. We adopt the linear maximal-ratio transmission beamforming for massive MIMO power transfer to recharge users. By deriving new statistical properties, we obtain the exact and asymptotic expressions for the average harvested energy. Then, we derive the average uplink achievable rate under the harvested energy constraint. Numerical results demonstrate that the use of massive MIMO antennas can improve both the users' harvested energy and uplink achievable rate in the HetNets; however, it has negligible effect on the ambient RF energy harvesting. Serving more users in the massive MIMO macrocells will deteriorate the uplink information transfer because of less harvested energy and more uplink interference. Moreover, although DRSP-based user association harvests more energy to provide larger uplink transmit power than the URSP-based one in the massive MIMO HetNets, URSP-based user association could achieve better performance in the uplink information transmission.

Type: Article
Title: Wireless Power Transfer in Massive MIMO-Aided HetNets with User Association
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TCOMM.2016.2594794
Publisher version: http://dx.doi.org/10.1109/TCOMM.2016.2594794
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
Keywords: Uplink, MIMO, Macrocell networks, Antenna arrays, Downlink, Radio frequency, wireless power transfer, Energy harvesting, heterogeneous network (HetNet), massive MIMO, user association
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/1528689
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