Energy Beamformer and Time Split Design for Wireless Powered Two-Way Relaying Systems

In this paper, we consider a power beacon (PB) assisted two-way relaying network, where two single antenna energy constrained users first harvest energy from a multi-antenna PB and then communicate with each other with the assistance of a relay. The key aim of the paper is to design the energy beamf...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2018-06, Vol.17 (6), p.3723-3736
Main Authors: Caijun Zhong, Han Liang, Hai Lin, Suraweera, Himal A., Fengzhong Qu, Zhaoyang Zhang
Format: Article
Language:English
Subjects:
Antennas
Array signal processing
energy beamforming
Optimization
Protocols
Relays
System performance
Two-way relaying
Wireless communication
wireless powered communications
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Summary:In this paper, we consider a power beacon (PB) assisted two-way relaying network, where two single antenna energy constrained users first harvest energy from a multi-antenna PB and then communicate with each other with the assistance of a relay. The key aim of the paper is to design the energy beamforming vector and time split parameter for optimizing the system performance. In particular, two different design objectives are investigated, namely, max-min rate design and sum rate maximization design. Due to the non-convex nature of the optimization problems, the global optimal solutions are difficult to obtain. Instead, we propose an alternating optimization design framework where near optimal performance can be achieved through iterative optimization. In addition, to further reduce the computation complexity, closed-form suboptimal designs are provided. Simulation results are presented to validate the effectiveness of the proposed alternating optimization design and suboptimal design. The outcomes of the paper suggest that adopting the proposed energy beamforming vector at the PB can substantially boost the system performance. Also, the topology of the network has a significant impact on the achievable performance.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2018.2815563