Abstract
Simultaneous wireless information and power transfer is a practicable solution to encourage energy-constrained relay nodes to cooperate with the source to transmit information to the destination. In this paper, we study the outage performance of hybrid protocol based amplify-and-forward (AF) relay networks over asymmetric fading channels, where the source-relay link and the relay-destination link are subjected to Rician fading and Rayleigh fading, respectively. In particular, we derive the lower bound of outage probability and the upper bound of outage capacity based on a high signal-to-noise ratio approximation, respectively. We further investigate the effects of various system parameters, such as the parameters of hybrid protocol, the target rate, and the Rician K-factor, on the investigated network. It is shown that a good selection of parameters of hybrid protocol is of significance to improve system capacity, and that a larger Rician factor is desirable in the investigated network.
Highlights
Internet of things (IoT) allows massive wireless devices, e.g., low power wireless sensor nodes, to access wireless networks and communicate with each other via a parallel access channel or multiple-access channel [1,2,3,4]
One can see that the concurrence between the simulated results and the theoretical results verify the theoretical analyses on the outage probability and the outage capacity
One can see that different parameters of hybrid protocol achieve different outage capacity
Summary
Internet of things (IoT) allows massive wireless devices, e.g., low power wireless sensor nodes, to access wireless networks and communicate with each other via a parallel access channel or multiple-access channel [1,2,3,4]. The derived results provide valuable insights into the impact of important system parameters especially for the PS ratio and TS ratio These works [21,22,23] were based on the Rayleigh fading channel, which may be an inappropriate model for the source-relay link. Different from the existing works [21,22,23] with a focus on the outage performance of a hybrid protocol over symmetric fading channels, we consider a more practical asymmetric fading channels, where the source-relay and relay-destination links experience Rician fading and Rayleigh fading, respectively. Numerical results are presented to verify the derived expression, and study the impacts of various network parameters on the outage capacity of hybrid protocol based relay networks.
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