Operation Scheme of SWIPT Relay System Based on Interference Energy Harvesting
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RESEARCH ARTICLE-ELECTRICAL ENGINEERING
Operation Scheme of SWIPT Relay System Based on Interference Energy Harvesting Jianxiong Li1,2 · Ke Zhao1,2 · Xuelong Ding1,2 · Weiguang Shi1,2 · Changyun Miao1,2 Received: 16 May 2018 / Accepted: 14 May 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract In wireless relay systems, interference often leads to system rate loss. Recently, the research on radio-frequency signal energy harvesting makes it possible to use interference energy. In this paper, based on the time switching (TS) relay operation strategy and amplify-and-forward protocol, the simultaneous wireless information and power transfer relay system under strong interference is studied. Firstly, we propose an interference energy harvesting (IEH) scheme to reduce the rate loss. Three theorems are proved, and the approximate optimal interference energy allocation factor is obtained. Secondly, we propose two relay operation schemes under strong interference, namely static optimal TS ratio scheme and adaptive optimal TS ratio scheme. Then, the expressions of the two schemes are derived, and the corresponding optimization problems are established. The algorithms for solving these two problems are given. The numerical simulation results show that the IEH schemes with static and adaptive optimal TS ratio can effectively improve the system rate, while the latter has better performance than the former. In addition, the effects of interference power and antenna noise power on the system rate are also studied. The results show that the performance of the two schemes is better than that of the scheme without IEH under different interference power and noise power. Keywords Simultaneous wireless information and power transfer · Interference energy harvesting · Time switching · Strong interference
1 Introduction Interference is the fundamental problem of wireless communication, which brings many challenges to wireless information transmission. It was once considered to be one of the important reasons for the degradation of wireless network performance [1]. Therefore, interference management (IM) has become a key issue [2–5]. Some IM methods have been proposed, such as interference alignment [6–8]. With the recent research progresses of radio-frequency (RF) signal energy harvesting (EH) [9–12], a new method to deal with interference is proposed: energy-constrained wireless network nodes harvest the energy of interference and use this energy to maintain their own needs [10–12]. * Changyun Miao [email protected] 1
School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China
Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, Tianjin 300387, China
2
Although the battery of the node can be replaced or recharged, it will lead to high cost and may be inconvenient or even dangerous, such as in a toxic environment [13]. The RF signal can carry information and energy at the same time. Simultaneous wireless information and power transfer
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