On the Optimality of Power Allocation for NOMA Downlinks With Individual QoS Constraints

This letter investigates a power allocation problem in a downlink single-input single-output non-orthogonal multiple access (NOMA) system. Our goal is to maximize the sum rate of users subject to minimum user rate requirements. We rigorously prove the optimal user decoding order, and show that the s...

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Bibliographic Details
Published inIEEE communications letters Vol. 21; no. 7; pp. 1649 - 1652
Main Authors Yang, Zhaohui, Xu, Wei, Pan, Cunhua, Pan, Yijin, Chen, Ming
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2017
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Decoding
Downlink
Downlinking
NOMA
Non-orthogonal multiple access (NOMA)
Nonorthogonal multiple access
Optimization
power allocation
Quality of service
Resource management
SISO
SISO (control systems)
sum rate maximization
Time division multiple access
User requirements
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Summary:This letter investigates a power allocation problem in a downlink single-input single-output non-orthogonal multiple access (NOMA) system. Our goal is to maximize the sum rate of users subject to minimum user rate requirements. We rigorously prove the optimal user decoding order, and show that the sum rate maximization problem is convex, which guarantees the globally optimal solution. Numerical results validate the performance gain by the proposed NOMA compared with conventional schemes.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2017.2689763