Abstract
In this paper, we evaluate a two-way relay system consisting of two terminals and an intermediate relay. In this model, two terminals do not have a direct link but exchange data with each other via the relay in three phases. The relay utilizes energy harvesting technology to collect energy from the received signals of two terminals in the first two phases and then uses the obtained energy for signal transmission in the third phase. Each node is equipped with a single antenna and operates under a half-duplex mode. All wireless channels are influenced by reversible independent flat Rayleigh fading. Using analytical methods, we provide the exact and approximate closed-form expressions of user outage probability and system outage probability. The approximate expressions of these outage probabilities are more explicit and straightforward, providing a better understanding of the influences of network parameters on the system quality. Monte-Carlo simulations are used to confirm the correctness of mathematical analyses.
Highlights
Nowadays, energy harvesting (EH) technology has become a hot research trend and attracted increasing interest from many research groups around the world [1,2,3]
Based on the operation of receiver, EH technology is divided into two main techniques: (i) time switching (TS), where the received signal is divided into two time phases to harvest energy and decode the signal, and (ii) power splitting (PS), where the received signal power is split into two parts for energy harvesting and signal decoding [9]
We have derived the exact and approximate closed-form expressions of the user outage probability and the system outage probability of a two-way DF relay system where the relay is not powered by a separated power supply but harvests the energy from the received radio frequency signals in two phases to convert it into the transmission power in the third phase
Summary
Energy harvesting (EH) technology has become a hot research trend and attracted increasing interest from many research groups around the world [1,2,3]. In [18], the authors considered a two-way relay cognitive radio system with a primary receiver They evaluated this decodeand-forward (DF) relay system where the relay applies EH technology and network coding by deriving a closed-form expression of the system outage probability at terminals. The authors in [21] analyzed the outage probability and throughput of a three-phase two-way DF relay system model where the relay harvests the energy from radio frequency signals in the first two phases and converts it to transmission power in the third phase. Applying a piecewise linear energy harvesting model for the users and the relay in dual-hop wireless powered two-way communication, the authors in [25] investigated the problem of total throughput maximization of both AF and DF relaying models They concluded that it is essential to study a realistic EH model as the impractical linear EH model causes tremendous performance loss.
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