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Wireless-Powered Relays Assisted Batteryless IoT Networks Empowered by Energy Beamforming

Yanming CHEN, Bin LYU, Zhen YANG, Fei LI

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Summary :

In this letter, we propose an energy beamforming empowered relaying scheme for a batteryless IoT network, where wireless-powered relays are deployed between the hybrid access point (HAP) and batteryless IoT devices to assist the uplink information transmission from the devices to the HAP. In particular, the HAP first exploits energy beamforming to efficiently transmit radio frequency (RF) signals to transfer energy to the relays and as the incident signals to enable the information backscattering of batteryless IoT devices. Then, each relay uses the harvested energy to forward the decoded signals from its corresponding batteryless IoT device to the HAP, where the maximum-ratio combing is used for further performance improvement. To maximize the network sum-rate, the joint optimization of energy beamforming vectors at the HAP, network time scheduling, power allocation at the relays, and relection coefficient at the users is investigated. As the formulated problem is non-convex, we propose an alternating optimization algorithm with the variable substitution and semi-definite relaxation (SDR) techniques to solve it efficiently. Specifically, we prove that the obtained energy beamforming matrices are always rank-one. Numerical results show that compared to the benchmark schemes, the proposed scheme can achieve a significant sum-rate gain.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E106-A No.2 pp.164-168
Publication Date
2023/02/01
Publicized
2022/08/23
Online ISSN
1745-1337
DOI
10.1587/transfun.2022EAL2033
Type of Manuscript
LETTER
Category
Mobile Information Network and Personal Communications

Authors

Yanming CHEN
  Nanjing University of Posts and Telecommunications
Bin LYU
  Nanjing University of Posts and Telecommunications
Zhen YANG
  Nanjing University of Posts and Telecommunications
Fei LI
  Nanjing University of Posts and Telecommunications

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