Outage rates and outage durations of opportunistic relaying systems

TL;DR

This paper derives exact formulas for outage rates and durations in opportunistic relaying systems with mobile stations and relays, highlighting the impact of mobility on system reliability in Rayleigh fading environments.

Contribution

It provides the first exact analytical expressions for the average outage rate and duration in mobile opportunistic relaying systems with multiple relays and Rayleigh fading.

Findings

Derived closed-form expressions for AOR and AOD.

Analyzed the effects of mobility on outage statistics.

Applicable to systems with arbitrary relay numbers and relay types.

Abstract

Opportunistic relaying is a simple yet efficient cooperation scheme that achieves full diversity and preserves the spectral efficiency among the spatially distributed stations. However, the stations' mobility causes temporal correlation of the system's capacity outage events, which gives rise to its important second-order outage statistical parameters, such as the average outage rate (AOR) and the average outage duration (AOD). This letter presents exact analytical expressions for the AOR and the AOD of an opportunistic relaying system, which employs a mobile source and a mobile destination (without a direct path), and an arbitrary number of (fixed-gain amplify-and-forward or decode-and-forward) mobile relays in Rayleigh fading environment.