Resource Allocation for Downlink NOMA Systems: Key Techniques and Open Issues
TLDR
In this paper, the authors proposed a divide-and-next-largest-difference-based user pairing algorithm to distribute the capacity gain among the NOMA clusters in a controlled manner.Abstract:Â
This article presents advances in resource allocation for downlink non-orthogonal multiple access (NOMA) systems, focusing on user pairing and power allocation algorithms. The former pairs the users to obtain high capacity gain by exploiting the channel gain difference between the users, while the latter allocates power to users in each cluster to balance system throughput and user fairness. Additionally, the article introduces the concept of cluster fairness and proposes the divide-and-next-largest-difference-based user pairing algorithm to distribute the capacity gain among the NOMA clusters in a controlled manner. Furthermore, performance comparison between multiple-input multiple-output NOMA (MIMO-NOMA) and MIMO orthogonal multiple access (MIMO-OMA) is conducted when users have pre-defined quality of service. Simulation results are presented, which validate the advantages of NOMA over OMA. Finally, the article provides avenues for further research on resource allocation for downlink NOMA.read more
Citations
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Proceedings ArticleDOI
Maximizing Downlink Non-Orthogonal Multiple Access System Capacity by A Hybrid User Pairing Strategy
TL;DR: In this article, the authors proposed a hybrid user pairing algorithm to process a case where the number of far users in a cell is larger than number of near users, and multiple far users share the same bandwidth.
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Minimizing Age-of-Information in HARQ-CC Aided NOMA Systems
TL;DR: In this article , an adaptive transmission policy under hybrid automatic repeat request with chase combining (HARQ-CC) aided NOMA systems is proposed to efficiently utilize the time-frequency resource and achieve a tradeoff between timeliness and reliability.
Proceedings ArticleDOI
Precoding and Scheduling in Multibeam Multicast NOMA based Satellite Communication Systems
Sareh Majidi Ivari,Marius Caus,Miguel Angel Vazquez,M. Reza Soleymani,Yousef R. Shayan,Ana I. Perez-Neira +5 more
TL;DR: In this paper, a multibeam multicast non-orthogonal multiple access-based (MB-MC-NOMA) scheme for satellite communication systems is proposed, which exploits precoding and NOMA techniques to deal with inter-and intra-beam interference.
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Low Complexity Optimization of the Asymptotic Spectral Efficiency in Massive MIMO NOMA
TL;DR: The proposed method maximizes the sum-capacity of the considered system, subject to power and performance constraints, and demonstrates greater accuracy than alternative approaches despite remaining low-complexity for arbitrarily large antenna arrays.
Posted Content
A Low-Complexity Framework for Joint User Pairing and Power Control for Cooperative NOMA in 5G and Beyond Cellular Networks
TL;DR: In this paper, the authors investigated the performance of cooperative NOMA in a cellular downlink system and formulated a novel optimization problem that jointly determines the optimal D2D user pairing and the optimal power control scheme, where the objective is maximizing the achievable sum rate of the whole system while guaranteeing a certain quality of service (QoS) for all users.
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Impact of User Pairing on 5G Nonorthogonal Multiple-Access Downlink Transmissions
TL;DR: Both analytical and numerical results are provided to demonstrate that F-NOMA can offer a larger sum rate than orthogonal MA, and the performance gain of F- NOMA over conventional MA can be further enlarged by selecting users whose channel conditions are more distinctive.
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Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges
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