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Title: Outage analysis and power allocation in uplink non-orthogonal multiple access systems
Authors: Liu, Ye
Derakhshani, Mahsa
Lambotharan, Sangarapillai
Keywords: Non-orthogonal multiple access
Outage probability
Fairness
Power allocation
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Citation: LIU, Y., DERAKHSHANI, M. and LAMBOTHARAN, S., 2017. Outage analysis and power allocation in uplink non-orthogonal multiple access systems. IEEE Communications Letters, In Press.
Abstract: 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.
Description: This is an Open Access Article. It is published by IEEE under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This work has been supported by the Engineering and Physical Science Research Council of the UK, EPSRC, under the grant EP/M015475.
Version: Published version
DOI: 10.1109/LCOMM.2017.2769088
URI: https://dspace.lboro.ac.uk/2134/27373
Publisher Link: https://doi.org/10.1109/LCOMM.2017.2769088
ISSN: 1089-7798
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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