On the design of relay selection strategy for two‐way amplify‐and‐forward mobile relaying. Issue 17 (1st November 2013)

• Record Type: Journal Article
• Authors: Xia, Xiaochen; Xu, Kui; Ma, Wenfeng; Xu, Youyun
• Is Part Of: IET communications. Volume 7:Issue 17(2013)
• Page Start: 1948
• Page End: 1957
• Publication Date: 2013-11-01
• Subjects: diversity reception -- fading channels -- mobile radio -- probability -- protocols -- telecommunication network reliability -- network coding -- amplify and forward communication -- relay networks (telecommunication); two‐way amplify‐and‐forward mobile relaying -- opportunistic relay selection -- RS -- diversity gain -- analogue network coding protocol -- ANC protocol -- channel state information -- CSI -- time‐varying nature -- fading channels -- system performance -- outage performance -- statistical knowledge -- outage probabilities -- asymptotic expressions; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2013.0168
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : Opportunistic relay selection (RS) is an efficient method to obtain diversity gain in analogue network coding (ANC) protocol with multiple relays. However, in networks with mobile relays, the channel state information (CSI) used in the RS procedure becomes outdated because of the time‐varying nature of fading channels, which severely deteriorates the system performance. In this study, the authors study the RS strategy which aims to optimise the outage performance of the ANC protocol with multiple mobile relays. RS schemes for two different cases are designed, that is, (i) the scheme with only the outdated CSI during the RS procedure, and (ii) the scheme with both the outdated CSI and the statistical knowledge of channels during the RS procedure. The closed‐form expressions of the outage probabilities as well as the asymptotic expressions are analytically derived for the proposed schemes, and moreover, the achievable diversities are analysed based on the asymptotic expressions. Simulation results are presented to evaluate the performances while validate the theoretical analyses for the proposed schemes.