Optimization of Rate Fairness in Multi-Pair Wireless-Powered Relaying Systems
- Authors
- Bui V.-P.; Nguyen V.-D.; Nguyen H.V.; Dobre O.A.; Shin O.-S.
- Issue Date
- Mar-2020
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Inner approximation; relay network; simultaneous wireless information and power transfer (SWIPT)
- Citation
- IEEE Communications Letters, v.24, no.3, pp.603 - 607
- Journal Title
- IEEE Communications Letters
- Volume
- 24
- Number
- 3
- Start Page
- 603
- End Page
- 607
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/35769
- DOI
- 10.1109/LCOMM.2019.2960350
- ISSN
- 1089-7798
- Abstract
- This letter considers a multi-pair decode-and-forward relay network where a power-splitting (PS) protocol is adopted at the energy-constrained relay to provide simultaneous wireless information and energy harvesting (EH). To achieve higher efficiency of EH, we propose a new PS-based EH architecture at the relay by incorporating an alternating current (AC) computing logic, which is employed to directly use the wirelessly harvested AC energy for computational blocks. Under a nonlinear EH circuit, our goal is to maximize the fairness of end-to-end rate among user pairs subject to power constraints, resulting in a non-convex problem. We propose an iterative algorithm to achieve a suboptimal and efficient solution to this challenging problem by leveraging the inner approximation framework. Numerical results demonstrate that the proposed algorithm outperforms the traditional direct current computing and other baseline schemes. © 1997-2012 IEEE.
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