Unified Analysis of Transmit Antenna Selection in MIMO Multi-Relay Networks

Document type: Journal Articles
Article type: Original article
Peer reviewed: Yes
Full text:
Author(s): Phee Lep Yeoh, Maged Elkashlan, Nan Yang, Daniel B. da Costa, Quang Trung Duong
Title: Unified Analysis of Transmit Antenna Selection in MIMO Multi-Relay Networks
Journal: IEEE Trans on Vehicular Technology
Year: 2013
Volume: 62
Issue: 2
ISSN: 0018-9545
Publisher: IEEE
URI/DOI: Unified Analysis of Transmit Antenna Selection in MIMO Multi-Relay Networks
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
http://www.bth.se/com
Authors e-mail: quang.trung.duong@bth.se
Language: English
Abstract: We present a unified asymptotic framework for transmit antenna selection in multiple-input multiple-output (MIMO) multi-relay networks with Rician, Nakagami-m, Weibull, and Generalized-K fading channels. We apply this framework to derive new closed-form expressions for the outage probability and symbol error rate (SER) of amplify-andforward relaying in MIMO multi-relay networks with two distinct protocols: 1) transmit antenna selection with receiver maximalratio combining (TAS/MRC), and 2) transmit antenna selection with receiver selection combining (TAS/SC). Based on these expressions, the diversity order and the array gain with M-ary phase shift keying and M-ary quadrature amplitude modulation are derived.We corroborate that the diversity order only depends on the fading distribution and the number of diversity branches, whereas the array gain depends on the fading distribution, the modulation format, the number of diversity branches, and the average per-hop signal-to-noise ratios (SNRs). We highlight that the diversity order of TAS/MRC is the same as TAS/SC, regardless of the underlying fading distribution. As such, we explicitly characterize the SNR gap between TAS/MRC and TAS/SC as the ratio of their respective array gains. An interesting observation is reached that for equal per-hop SNRs, the SNR gap between the two protocols is independent of the number of relays.
Subject: Telecommunications\General
Keywords: MIMO, TAS/MRC, TAS/SC, relays
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