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Telfor Journal
2015, vol. 7, iss. 1, pp. 14-19
article language: English
document type: unclassified
doi:10.5937/telfor1501014D
Trade-off analysis of energy-efficiency versus generated interference when using regenerative relay
aUniversity of Belgrade, 'Mihajlo Pupin' Institute, Belgrade
bUniversity of Novi Sad, Faculty of Technical Science
cUniversidade Lusofona de Humanidades e Technologias, Lisbon and UNINOVA-Campus FCT/UNL, Caparica, Portugal + INESC-INOV, Instituto Superior Tecnico, University of Lisbon, Lisbon, Portugal

e-mail: goran.dimic@pupin.rs, dragana.bajic@gmail.com, beko.marko@gmail.com

Project

Development and Modeling of Energy-Efficient, Adaptable, Multiprocessor and Multisensor Low-Power Electronic Systems (MESTD - 32043)
Biosensing Technologies and Global System for Long-Term Research and Integrated Management of Ecosystems (MESTD - 43002)
APV 114-451-2061/2011-01, bilateral cooperation project Portugal-Serbia grant 451-03-02338/2012-14/11, and PTDC/EEI-TEL/2990/2012-ADIN and EXPL/EEITEL/0969/2013

Abstract

When using a regenerative relay, a trade-off between increasing the energy efficiency versus reducing the generated interference arises. In this paper, the generated interference in the direct link from the base station to a user terminal is compared with the generated interference from both the base station and the relay node in regenerative relay transmissions. In the space of channel losses, in the transceivers' operating region, the lines corresponding to the generated interference ratio comparing the relay scheme and the direct link are depicted. It is shown that it is possible to tune the energy-efficiency vs generated interference trade-off, by adjusting the transmit powers, constellation size and code rate. The trade-off depends on the channel losses along the links. A key enabler of the trade-off is the appropriate placement of the relay node.

Keywords

energy efficiency; hetnets; interference reduction; power control; regenerative relay; wireless

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