Distributed Relay Selection Protocols for Simultaneous Wireless Information and Power Transfer

TL;DR

This paper introduces two distributed relay selection protocols for RF energy harvesting wireless networks, demonstrating improved performance through analytical derivations and simulations, with the MSNR protocol outperforming MHE.

Contribution

The paper proposes two novel relay selection protocols, MHE and MSNR, tailored for energy-harvesting AF relay networks, with analytical performance evaluation and simulation validation.

Findings

MSNR protocol outperforms MHE in system performance.

Both protocols improve outage probability compared to baseline.

Simulation results confirm analytical derivations and theoretical insights.

Abstract

Harvesting energy from the radio-frequency (RF) signal is an exciting solution to replenish energy in energy-constrained wireless networks. In this paper, an amplify-and-forward (AF) based wireless relay network is considered, where the relay nodes need to harvest energy from the source's RF signal to forward information to the destination. To improve the performance of information transmission, we propose two distributed relay selection protocols, Maximum Harvested Energy (MHE) protocol and Maximum Signal-to-Noise Ratio (MSNR) protocol. Then, we derive the outage probabilities of the system with our proposed relay selection protocols and prove that the proposed selection protocols indeed can improve the system performances and the MSNR protocol outperforms the MHE protocol. Simulation results verify the analysis and theorems. In addition, the effects of key system parameters are also investigated via simulations.