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Energy-Efficient Cooperative Network Coding With Joint Relay Scheduling and Power Allocation
KTH. Northwestern Polytechnical University, China.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
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2016 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 64, no 11, p. 4506-4519Article in journal (Refereed) Published
Abstract [en]

The energy efficiency (EE) of a multi-user multi-relay system with the maximum diversity network coding (MDNC) is studied. We explicitly find the connection among the outage probability, energy consumption, and EE, and formulate the maximizing EE problem under the outage probability constraint. Relay scheduling (RS) and power allocation (PA) are applied to schedule the relay states (transmitting, sleeping, and so on) and optimize the transmitting power under the practical channel and power consumption models. Since the optimization problem is NP hard, to reduce computational complexity, the outage probability is first tightly approximated to a log-convex form. Furthermore, the EE is converted into a subtractive form based on the fractional programming. Then, a convex mixed-integer nonlinear problem is eventually obtained. With a generalized outer approximation algorithm, RS and PA are solved in an iterative manner. The Pareto-optimal curves between the EE and the target outage probability show the EE gains from PA and RS. Moreover, by comparing with the no network coding (NoNC) scenario, we conclude that with the same number of relays, MDNC can lead to EE gains. However, if RS is implemented, NoNC can outperform MDNC in terms of the EE when more relays are needed in the MDNC scheme.

Place, publisher, year, edition, pages
IEEE, 2016. Vol. 64, no 11, p. 4506-4519
Keywords [en]
Energy efficiency-outage probability tradeoff, network coding, relay scheduling, power allocation, generalized outer approximation (GOA)
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-199561DOI: 10.1109/TCOMM.2016.2602830ISI: 000388873800006Scopus ID: 2-s2.0-84999740124OAI: oai:DiVA.org:kth-199561DiVA, id: diva2:1065076
Note

QC 20170113

Available from: 2017-01-13 Created: 2017-01-09 Last updated: 2017-11-29Bibliographically approved

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Xiao, MingSkoglund, MikaelCao, Phuong

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