Relaying Energy Allocation Scheme Based on Multi-User SWIPT Relaying System

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Relaying Energy Allocation Scheme Based on Multi-User SWIPT Relaying System Xianguo Li 1,2 & Xuelong Ding 1,2 & Kunlai Li 1,2 & Jianxiong Li 1,2

&

Weiguang Shi 1,2

# Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract This paper investigates the relay energy allocation scheme based on the time switching (TS) operation strategy in multi-user simultaneous wireless information and power transfer (SWIPT) relaying system, where the relay is energy-constrained and utilizes the energy harvested in the energy harvesting mode to amplify and forward the information of the users. In the multiuser relaying system, the distances of the receivers of the users to the relay may be different. Thus, the total information rate maximization model is proposed and the corresponding energy allocation scheme is derived. After comparing the information rates of users, it is found that the information rates of users who are far from the relay are significantly lower than those of users who are close to the relay, i.e., “far-near” phenomenon. For the “far-near” problem, we propose the common information rate maximization model, and derive the corresponding energy allocation scheme. In this model, the information rates of all users are equal, which ensures the fairness of the information rate in multi-user relaying communication system. The simulation results show that the energy allocation scheme based on the common information rate maximization model can effectively solve the “far-near” problem in multi-user relaying communication system. Keywords Simultaneous wireless information and power transfer . Multi-user relaying system . Amplify-and-forward . Energy harvesting . Information rate

1 Introduction With the rapid development of human civilization, people gradually realize the importance of green energy. Besides the sun and the wind, the electromagnetic wave in free space also is green energy. The radio frequency (RF) signals can not only transmit information, but also carry energy. The energy harvesting (EH) technology based on RF signals plays an important role in the field of communication. Recently, there has been an upsurge of research interests in the RF-EH technique [1]. As the RF-EH technique is typically suitable for low-power applications, it is getting more and more research and has been applied quickly in various forms, such as wireless sensor networks [2], wireless body networks [3], and wireless charging systems [4]. * Jianxiong Li [email protected] 1

School of Electronics and Information Engineering, Tiangong University, Tianjin 300387, China

2

Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems, Tianjin 300387, China

Since Varshney L R first proposed the concept of simultaneous wireless information and power transfer (SWIPT) [5], this technique has attracted increasing interest. In [5], the authors investigated the fundamental tradeoff between the information transmission rate and power transfer. The SWIPT can provide a controllable and efficient allocation sche