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Outage analysis and power allocation in uplink non-orthogonal multiple access systems

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posted on 10.11.2017, 15:07 by Ye Liu, Mahsa DerakhshaniMahsa Derakhshani, Sangarapillai LambotharanSangarapillai Lambotharan
We propose a tractable expression for the outage probability in single-cell uplink non-orthogonal multiple access (NOMA) systems serving an arbitrary number of users. The expression is obtained by approximating the inter-user interference using a shifted-gamma distributed random variable. We then formulate and propose an efficient iterative algorithm for the outage-constrained min-max power allocation problem for the NOMA system. To give a rigorous comparison, we solve the outage-constrained min-max power allocation problem for the orthogonal multiple access (OMA) counterpart where both the user power allocation and the radio resource division pattern are optimized. Simulations confirm the accuracy of the derived outage probability expression for the NOMA system. Also, we demonstrate that fairness among users in terms of transmission power can be achieved by NOMA. Moreover, NOMA can bring significant power savings to the users as compared to OMA.

Funding

This work has been supported by the Engineering and Physical Science Research Council of the UK, EPSRC, under the grant EP/M015475.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Communications Letters

Citation

LIU, Y., DERAKHSHANI, M. and LAMBOTHARAN, S., 2018. Outage analysis and power allocation in uplink non-orthogonal multiple access systems. IEEE Communications Letters, 22(2), pp. 336-339.

Publisher

Institute of Electrical and Electronics Engineers

Version

NA (Not Applicable or Unknown)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

Acceptance date

26/10/2017

Publication date

2017-11-02

Notes

This is an Open Access Article. It is published by IEEE under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/

ISSN

1089-7798

Language

en