Joint Optimal Power Allocation and Relay Selection Scheme in Energy Harvesting Two-Way Relaying Network

Xin Song, Siyang Xu, Zhigang Xie and Xiuwei Han
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Xin Song: Engineering Optimization and Smart Antenna Institute, Northeastern University, Qinhuangdao 066004, China
Siyang Xu: Engineering Optimization and Smart Antenna Institute, Northeastern University, Qinhuangdao 066004, China
Zhigang Xie: Engineering Optimization and Smart Antenna Institute, Northeastern University, Qinhuangdao 066004, China
Xiuwei Han: Engineering Optimization and Smart Antenna Institute, Northeastern University, Qinhuangdao 066004, China

Future Internet, 2019, vol. 11, issue 2, 1-12

Abstract: In this paper, we propose a joint power allocation, time switching (TS) factor and relay selection scheme for an energy harvesting two-way relaying communication network (TWRN), where two transceivers exchange information with the help of a wireless-powered relay. By exploiting the TS architecture at the relay node, the relay node needs to use additional time slots for energy transmission, reducing the transmission rate. Thus, we propose a joint resource allocation algorithm to maximize the max-min bidirectional instantaneous information rate. To solve the original non-convex optimization problem, the objective function is decomposed into three sub-problems and solved sequentially. The closed-form solution of the transmit power of two sources and the optimal TS factor can be obtained by the information rate balancing technology and the proposed time allocation scheme, respectively. At last, the optimal relay node can be obtained. Simulation results show that the performance of the proposed algorithm is better than the traditional schemes and power-splitting (PS) scheme.

Keywords: energy harvesting; two-way relaying network; max-min bidirectional information rate; power allocation; relay selection (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2019
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