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Dynamic Power Allocation for Downlink Multi-Carrier NOMA Systems
Rhein Westfal TH Aachen, Inst Networked Syst, D-52072 Aachen, Germany..
KTH, School of Electrical Engineering and Computer Science (EECS), Communication Systems, CoS, Radio Systems Laboratory (RS Lab).
2018 (English)In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 22, no 9, p. 1930-1933Article in journal (Refereed) Published
Abstract [en]

In this letter, the performance of optimal dynamic power allocation (PA) is analyzed for downlink multi-carrier non-orthogonal multiple access (MC-NOMA) systems. We study the PA optimization problem with a pair of users and weighted-sum-rate utility. A novel low-complexity algorithm is designed to solve the problem with a closed-form PA expression. The analytical data rate performance is derived and verified by simulation results. The numerical results indicate that a large difference in user channel states improves performance by enhancing the user diversity gain in NOMA systems. Moreover, the channel diversity gain can be achieved by multi-carrier transmission and increases with the number of subcarriers. Finally, the number of subcarriers for dynamic PA in MC-NOMA systems is discussed for practical applications.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2018. Vol. 22, no 9, p. 1930-1933
Keywords [en]
Non-orthogonal multiple access, performance analysis, power allocation, multi-carrier transmission
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235599DOI: 10.1109/LCOMM.2018.2852655ISI: 000444531700047Scopus ID: 2-s2.0-85049441195OAI: oai:DiVA.org:kth-235599DiVA, id: diva2:1252172
Note

QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2019-03-06Bibliographically approved

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