Joint Resource Allocation for SWIPT-Based Two-Way Relay Networks

Chunling Peng, Guozhong Wang, Fangwei Li and Huaping Liu
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Chunling Peng: The School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing 400054, China
Guozhong Wang: The School of Communication and Information Engineering, Chongqing College of Electronic Engineering, Chongqing 401331, China
Fangwei Li: The School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
Huaping Liu: The School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA

Energies, 2020, vol. 13, issue 22, 1-21

Abstract: This paper considers simultaneous wireless information and power transfer (SWIPT) in a decode-and-forward two-way relay (DF-TWR) network, where a power splitting protocol is employed at the relay for energy harvesting. The goal is to jointly optimize power allocation (PA) at the source nodes, power splitting (PS) at the relay node, and time allocation (TA) of each duration to minimize the system outage probability. In particular, we propose a static joint resource allocation (JRA) scheme and a dynamic JRA scheme with statistical channel properties and instantaneous channel characteristics, respectively. With the derived closed-form expression of the outage probability, a successive alternating optimization algorithm is proposed to tackle the static JRA problem. For the dynamic JRA scheme, a suboptimal closed-form solution is derived based on a multistep optimization and relaxation method. We present a comprehensive set of simulation results to evaluate the proposed schemes and compare their performances with those of existing resource allocation schemes.

Keywords: SWIPT; decode and forward; two-way relay; power splitting; joint resource allocation (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: 2020
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