Decode-to-cooperate: A sequential alamouti-coded cooperation strategy in dual-hop wireless relay networks

Hussain, Nasir, Ziri-Castro, Karla, Jayalath, Dhammika, & Arafah, Mohammed (2016) Decode-to-cooperate: A sequential alamouti-coded cooperation strategy in dual-hop wireless relay networks. Telecommunication Systems.

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An optimal cooperation strategy, decode-to-cooperate, is proposed and investigated for performance improvements in dual-hop wireless relay networks. Based on decode-and-forward (DF) strategy with multiple relay selection, we design a novel scheme such that the source node keeps transmitting sequentially and the selected relays cooperate by transmitting the decoded signal using distributed Alamouti coding. We exploit the multipath propagation effect of the wireless channel to achieve lower probability of error and introduce optimum power allocation and relay positioning. We analyze the scenario when the source to destination direct link is not available and derive a closed form expression for symbol error rate (SER), its upper bound and an asymptotically tight approximation to exploit the performance gain by selecting the optimum relays in a multiple-relay cooperation scheme. Moreover, asymptotic optimum power allocation (based on the SER approximation) and optimal relay positioning are also considered to further improve the SER. The proposed relay selection scheme outperforms cooperative (DF) and non-cooperative schemes by more than 2 dB.

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ID Code: 95869
Item Type: Journal Article
Refereed: Yes
Keywords: Cooperative communications, Relay selection, Virtual antenna array, Alamouti coding, Optimum relay position, Optimum power allocation
DOI: 10.1007/s11235-016-0181-3
ISSN: 1572-9451
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Signal Processing (090609)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 The Author(s)
Copyright Statement: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Deposited On: 30 May 2016 22:55
Last Modified: 31 May 2016 21:51

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