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On the Energy Efficiency in Multi-user Multi-relayCoded Network
KTH, School of Electrical Engineering (EES). School of Electronics and Information, Northwestern Polytechnical University, China.
KTH, School of Electrical Engineering (EES), Communication Theory.
Department of Electrical Engineering, Technological Educational Institute of Central Greece, Greece and School of Engineering, Nazarbayev University, Kazakhstan.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-0108-0749
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2016 (English)Conference paper (Refereed)
Abstract [en]

In this paper, the energy efficiency (EE) of a cooperative diversity system with maximum diversity network coding (MDNC) is studied. In the considered system, channel state information (CSI) is only available at the receivers for all the channels. We formulate the problem of maximizing the EEunder the constraint on the outage probability. The problem is NP-hard due to the non-convexity of the outage probability function and the nonlinear fractional structure of the introducedEE. To solve the optimization problem efficiently, first, the outage probability function is tightly approximated as a log-convex form in the high signal-to-noise ratio (SNR) region. Further, based on the fractional programming, we transform the introduced EEinto a subtractive-form, which is proved to be a convex form. The tradeoff between outage probability and EE is given. The results show that our power allocation (PA) policy can substantially increase the EE. We show that EE can be increased if more relays forward the messages. Additionally, we also investigate the effect of the relay locations on the EE and demonstrate that the increase in the transmission distance in the first hop causes the loss of the EE. The loss can be reduced by our PA policy.

Place, publisher, year, edition, pages
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Engineering and Technology
URN: urn:nbn:se:kth:diva-187644OAI: diva2:930848
23rd International Conference on Telecommunications (ICT 2016)

QC 20160923

Available from: 2016-05-25 Created: 2016-05-25 Last updated: 2016-09-23Bibliographically approved

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Qi, NanXiao, MingCao, PhuongMikael, Skoglund
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