Resource Allocation for Wireless-Powered Full-Duplex Relaying Systems With Nonlinear Energy Harvesting Efficiency

被引:32
作者
Wei, Zhongxiang [1 ]
Sun, Sumei [2 ]
Zhu, Xu [3 ,4 ]
Kim, Dong In [5 ]
Ng, Derrick Wing Kwan [6 ]
机构
[1] UCL, Dept Elect & Elect Engn, Mortimer St, London WC1E 6BT, England
[2] ASTAR, Inst Infocom Res, Singapore 138632, Singapore
[3] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England
[4] Harbin Inst Technol, Sch Elect & Informat Engn, Shenzhen 518055, Peoples R China
[5] Sungkyunkwan Univ, Dept Elect & Comp Engn, Suwon 16419, South Korea
[6] Univ New South Wales, Sch Elect Engn & Telecommun, Sydney, NSW 2052, Australia
基金
澳大利亚研究理事会; 新加坡国家研究基金会;
关键词
Resource allocation; full-duplex relaying; wireless power transfer; non-linear energy harvesting; OFDMA SYSTEMS; INFORMATION; COMMUNICATION; OPTIMIZATION; PROTOCOLS; NETWORKS; CHANNEL; DESIGN;
D O I
10.1109/TVT.2019.2948792
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In wireless power transfer (WPT)-assisted relaying systems, spectral efficiency (SE) of source-relay link plays a dominant role in system SE performance due to the limited transmission power at the WPT-aided relay. In this paper, we propose a novel protocol for a downlink orthogonal frequency division multiple access (OFDMA) system with a WPT-aided relay operating in full-duplex (FD) decode-and-forward (DF) mode, where the time slot durations of the source-relay and relay-users hops are designed to be dynamic, to enhance the utilization of degrees of freedom and hence the system SE. In particular, a multiple-input and signal-output (MISO) source-relay channel is considered to satisfy the stringent sensitivity of the energy harvesting (EH) circuit at the relay, while a single-input and single-output (SISO) relay-user channel is considered to alleviate the power consumption at the relay node. Taking into account the non-linearity of EH efficiency, a near-optimal iteration-based dynamic WPT-aided FD relaying (A-FR) algorithm is developed by jointly optimizing the time slot durations, subcarriers, and transmission power at the source and the relay. Furthermore, self-interference generated at the relay is utilized as a vital energy source rather than being canceled, which increases substantially the total energy harvested at the FD relay. We also reveal some implicit characteristics of the considered WPT-aided FD relaying system through intensive discussions. Simulation results confirm that the proposed A-FR achieves a significant enhancement in terms of SE with different relay's locations and the number of users, compared to the conventional symmetric WPT-aided FD relaying (S-FR) and the time-switching-based WPT-aided FD relaying (TS-FR) benchmarks.
引用
收藏
页码:12079 / 12093
页数:15
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