Title :
Impact of Outdated Channel Estimates on a Distributed Link-Selection Scheme for AF Relaying Networks
Author :
Moya Osorio, Diana Pamela ; Benitez Olivo, Edgar Eduardo ; da Costa, Daniel Benevides ; Silveira Santos Filho, Jose Candido
Author_Institution :
Dept. of Commun., Univ. of Campinas, Campinas, Brazil
Abstract :
We investigate the impact of outdated channel estimates on the outage performance of a distributed link-selection scheme recently proposed for variable-gain amplify-and-forward relaying networks. In this scheme, either the direct link or the relaying link is preselected before each transmission, based on a distributed mechanism. We begin by showing that an exact analysis is rather intricate, yielding a multifold integral-form solution. Motivated by this, we then derive a simple closed-form lower bound, which, importantly, proves to be a very tight approximation to the exact outage probability. We also assess the system diversity order via asymptotic analysis.
Keywords :
amplify and forward communication; approximation theory; channel estimation; probability; relay networks (telecommunication); asymptotic analysis; distributed link-selection scheme; exact analysis; exact outage probability; multifold integral-form solution; outdated channel estimates; tight approximation; variable-gain amplify-and-forward relaying networks; Approximation methods; Array signal processing; Channel estimation; Fading; Relays; Signal to noise ratio; Wireless communication; Cooperative diversity; distributed link selection; outage probability; outdated channel state information;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/LWC.2015.2393301
