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.
Highlights
As the Internet of Things (IoT) continues to develop, the number of low-power wireless devices connected to the Internet will increase rapidly
Inspired by the above works, we focus on the joint resource allocation (JRA) problem in a two-phase two-way relay (TWR) network using simultaneous wireless information and power transfer (SWIPT)
The optimization work is designed to minimize the system outage probability (OP) by jointly optimizing the time allocation (TA) ratio, power splitting (PS) ratio, and power allocation (PA) ratio, which has not been fully studied in SWIPT-based TWR relay networks
Summary
As the Internet of Things (IoT) continues to develop, the number of low-power wireless devices connected to the Internet will increase rapidly. In [18], a resource allocation scheme is proposed for DF-OWR networks This scheme jointly optimizes power allocation (PA), relay placement, and power splitting (PS), aiming to minimize the outage probability. In Reference [19], a joint time allocation (TA) and PS allocation scheme to improve outage performance and ergodic capacity is proposed and analyzed for SWIPT-based OWR networks. The optimization work is designed to minimize the system outage probability (OP) by jointly optimizing the TA ratio, PS ratio, and PA ratio, which has not been fully studied in SWIPT-based TWR relay networks. A comprehensive multidimension resource optimization framework to enhance the outage performance for a SWIPT-based DF-TWR network is presented, in which power allocation, power splitting, and time allocation are jointly optimized.
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