Goodput Maximization in Cooperative Networks with ARQ

TL;DR

This paper analyzes the goodput performance of a 3-node cooperative network with ARQ in Rayleigh fading, comparing AF and DF relaying, and identifies optimal strategies for maximizing throughput.

Contribution

It provides a comprehensive formulation of goodput in cooperative networks with ARQ, including analysis of relay modes, protocols, and optimal relay placement.

Findings

Goodput expressions for AF and DF relaying are derived.

Optimal relay location and transmission rates are identified for maximum goodput.

Tradeoffs between goodput, relay position, and transmission rate are characterized.

Abstract

In this paper, the average successful throughput, i.e., goodput, of a coded 3-node cooperative network is studied in a Rayleigh fading environment. It is assumed that a simple automatic repeat request (ARQ) technique is employed in the network so that erroneously received codeword is retransmitted until successful delivery. The relay is assumed to operate in either amplify-and-forward (AF) or decode-and-forward (DF) mode. Under these assumptions, retransmission mechanisms and protocols are described, and the average time required to send information successfully is determined. Subsequently, the goodput for both AF and DF relaying is formulated. The tradeoffs and interactions between the goodput, transmission rates, and relay location are investigated and optimal strategies are identified.