Energy Efficiency Optimization for AF Relaying with TS-SWIPT

Guangyue Lu, Chan Lei, Yinghui Ye, Liqin Shi and Tianci Wang
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Guangyue Lu: The Shaanxi Key Laboratory of Information Communication Network and Security, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
Chan Lei: The Shaanxi Key Laboratory of Information Communication Network and Security, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
Yinghui Ye: School of Telecommunications Engineering, Xidian University, Xi’an 710071, China
Liqin Shi: School of Telecommunications Engineering, Xidian University, Xi’an 710071, China
Tianci Wang: The Shaanxi Key Laboratory of Information Communication Network and Security, Xi’an University of Posts and Telecommunications, Xi’an 710121, China

Energies, 2019, vol. 12, issue 6, 1-13

Abstract: In this paper, we focus on energy efficiency (EE) maximization for simultaneous wireless information and power transfer (SWIPT) based energy-constrained and amplify-and-forward (AF) relay networks. We adopt low-complexity time-switching (TS) protocol to realize SWIPT at the energy-constrained relay node, and formulate an EE maximization problem in which TS factor and transmit power control are needed to be jointly optimized. Since the formulated problem is non-convex and difficult to solve, we propose an algorithm combining fractional programming and alternating convex optimization to optimize TS factor and transmit power iteratively with low complexity. Simulation results are provided to demonstrate the convergence of the proposed algorithm, as well as the performance gains in terms of EE compared with other existing schemes.

Keywords: energy-constrained relay; time-switching (TS); SWIPT; amplify and forward (AF); energy efficiency (EE) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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