Optimal Power Allocation in Downlink Multicarrier NOMA Systems: Theory and Fast Algorithms

In this work, we propose globally optimal power allocation strategies to maximize the users sum-rate (SR), and system energy efficiency (EE) in the downlink of single-cell multicarrier non-orthogonal multiple access (MC-NOMA) systems. Each NOMA cluster includes a set of users in which the well-known...

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Vydáno v:IEEE journal on selected areas in communications Ročník 40; číslo 4; s. 1162 - 1189
Hlavní autoři: Rezvani, Sepehr, Jorswieck, Eduard A., Joda, Roghayeh, Yanikomeroglu, Halim
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.04.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Admission control
Algorithms
Broadcast channel
Closed form solutions
Clusters
Downlink
Downlinking
energy efficiency
Equivalence
Exact solutions
Mathematical analysis
multicarrier
Multiplexing
NGMA
NOMA
Nonorthogonal multiple access
Optimization
power allocation
Power demand
Resource management
Silicon carbide
successive interference cancellation
superposition coding
water-filling
ISSN:0733-8716, 1558-0008
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Shrnutí:In this work, we propose globally optimal power allocation strategies to maximize the users sum-rate (SR), and system energy efficiency (EE) in the downlink of single-cell multicarrier non-orthogonal multiple access (MC-NOMA) systems. Each NOMA cluster includes a set of users in which the well-known superposition coding (SC) combined with successive interference cancellation (SIC) technique is applied among them. By obtaining the closed-form expression of intra-cluster power allocation, we show that MC-NOMA can be equivalently transformed to a virtual orthogonal multiple access (OMA) system, where the effective channel gain of these virtual OMA users is obtained in closed-form. Then, the SR and EE maximization problems are solved by using very fast water-filling and Dinkelbach algorithms, respectively. The equivalent transformation of MC-NOMA to the virtual OMA system brings new theoretical insights, which are discussed throughout the paper. The extensions of our analyses to other scenarios, such as considering users rate fairness, admission control, long-term performance, and a number of future next-generation multiple access (NGMA) schemes enabling recent advanced technologies, e.g., reconfigurable intelligent surfaces are discussed. Extensive numerical results are provided to demonstrate the performance gaps among single-carrier NOMA (SC-NOMA), OMA-NOMA, and OMA.
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ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2022.3143237