NOMA-based energy-efficient wireless powered communications in 5G systems

Tewodros A. Zewde, Mustafa C Gursoy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

In this paper, we study the performance of nonorthogonal multiple access (NOMA) scheme in wireless-powered communication networks (WPCN) focusing on the system energy efficiency. We consider multiple energy-harvesting user equipments (UEs) that operate based on harvest-then-transmit protocol. The uplink information transfer is carried out by using powerdomain multiplexing, and the receiver decodes each UE's data in such a way that the UE with the best channel gain is decoded without interference. In order to determine optimal resource allocation strategies, we formulate optimization problems considering two models, namely half-duplex operation and asynchronous transmission, based on how downlink and uplink operations are coordinated. In both cases, we have concave-linear fractional problems, and hence Dinkelbach's method can be applied to obtain the globally optimal solutions. Thus, we first derive analytical expressions for the harvesting interval, and then we provide an algorithm to describe the complete procedure. Simulation results are included to justify the theoretical characterizations. In fact, we observe that broadcasting at higher power level is more energy efficient for WPCN with uplink NOMA.

Original languageEnglish (US)
Title of host publication2017 IEEE 86th Vehicular Technology Conference, VTC Fall 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-5
Number of pages5
Volume2017-September
ISBN (Electronic)9781509059355
DOIs
StatePublished - Feb 8 2018
Event86th IEEE Vehicular Technology Conference, VTC Fall 2017 - Toronto, Canada
Duration: Sep 24 2017Sep 27 2017

Other

Other86th IEEE Vehicular Technology Conference, VTC Fall 2017
CountryCanada
CityToronto
Period9/24/179/27/17

Keywords

  • Asynchronous transmission
  • Energy efficiency
  • Non-orthogonal multiple access
  • Wireless powered communication

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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  • Cite this

    Zewde, T. A., & Gursoy, M. C. (2018). NOMA-based energy-efficient wireless powered communications in 5G systems. In 2017 IEEE 86th Vehicular Technology Conference, VTC Fall 2017 - Proceedings (Vol. 2017-September, pp. 1-5). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/VTCFall.2017.8288114