A Comparison of Two MIMO Relaying Protocols in Nakagami- m Fading

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Maged Elkashlan, Phee Lep Yeoh, Nan Yang, Quang Trung Duong, Cyril Leung
Title: A Comparison of Two MIMO Relaying Protocols in Nakagami- m Fading
Journal: IEEE Trans on Vehicular Technology
Year: 2012
Volume: 61
Issue: 3
Pagination: 416 - 1422
ISSN: 0018-9545
Publisher: IEEE
URI/DOI: 10.1109/TVT.2012.2185259
ISI number: 000302081500040
Organization: Blekinge Institute of Technology
Department: School of Computing (Sektionen för datavetenskap och kommunikation)
School of Computing S-371 79 Karlskrona
+46 455 38 50 00
Authors e-mail: quang.trung.duong@bth.se
Language: English
Abstract: Transmit antenna selection with receive maximal-ratio combining (TAS/MRC) and transmit antenna selection with receive selection combining (TAS/SC) are two attractive multiple-input–multiple-output (MIMO) protocols. In this paper, we present a framework for the comparative analysis of TAS/MRC and TAS/SC in a two-hop amplify-and-forward relay network. In doing so, we derive exact and asymptotic expressions for
the symbol error rate (SER) in Nakagami-mfading. Using the asymptotic expressions, the SNR gap between the two protocols is quantified. Given that the two protocols maintain the same diversity order, we show that
the SNR gap is entirely dependent on the array gain. Motivated by this, we derive the SNR gap as a simple ratio of the respective array gains of the two protocols. This ratio explicitly takes into account the impact
of the number of antennas and the fading severity parameter m. In addition, we address the fundamental question of “How to allocate the total transmit power between the source and the relay in such a way that
the SER is minimized?” Our answer is given in the form of new compact expressions for the power allocation factor, which is a practical design tool that optimally distributes the total transmit power in the network.
Subject: Telecommunications\General