Energy Efficiency and Goodput Analysis in Two-Way Wireless Relay Networks

TL;DR

This paper analyzes the energy efficiency and goodput of two-way relay networks using AF and DF techniques, deriving expressions and optimizing transmission rates under Rayleigh fading.

Contribution

It introduces a Markov chain model for TWRNs with ARQ, deriving energy and goodput expressions, and compares AF and DF modes for optimal performance.

Findings

Optimal transmission rates minimize energy consumption and maximize goodput.

AF and DF modes show different trade-offs in energy and transmission efficiency.

Numerical results identify conditions for optimal network performance.

Abstract

In this paper, we study two-way relay networks (TWRNs) in which two source nodes exchange their information via a relay node indirectly in Rayleigh fading channels. Both Amplify-and-Forward (AF) and Decode-and-Forward (DF) techniques have been analyzed in the TWRN employing a Markov chain model through which the network operation is described and investigated in depth. Automatic Repeat-reQuest (ARQ) retransmission has been applied to guarantee the successful packet delivery. The bit energy consumption and goodput expressions have been derived as functions of transmission rate in a given AF or DF TWRN. Numerical results are used to identify the optimal transmission rates where the bit energy consumption is minimized or the goodput is maximized. The network performances are compared in terms of energy and transmission efficiency in AF and DF modes.