Outage Probability of Energy Harvesting Relay-aided Cooperative Networks Over Rayleigh Fading Channel

TL;DR

This paper analyzes the outage probability in energy harvesting relay-assisted cooperative networks over Rayleigh fading channels, deriving a closed-form expression and highlighting the impact of energy depletion on diversity gain.

Contribution

It provides a novel analytical expression for outage probability in energy harvesting relay networks, revealing the limitations on diversity gain and potential performance improvements.

Findings

Diversity gain is limited by relay energy exhaustion.

A multiplicative gain can be achieved by minimizing outage probability.

Closed-form outage probability expression derived for the proposed protocol.

Abstract

Energy harvesting technique is a potential way for relay node energy supply in cooperative networks in terms of deployment flexibility and maintain charge reduction. Unlike traditional power source, relay node in this case may run out of energy with certain probability, which can degrade the benefit from relay-aided cooperative transmission. In this paper, we concentrate on the outage behavior of cooperative networks aided by energy harvesting relay node in slow fading channel, and attempt to derive the closed-form expression of outage probability of proposed cooperative protocol. Compared with traditional direct transmission protocol, two conclusions are derived: 1) the diversity gain cannot be increased excepting the extreme case that energy-exhausted probability is zero; 2) a multiplicative gain for improving system performance can be obtained in terms of minimizing outage probability.