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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Journal ArticleDOI
Throughput fairness trade-offs for downlink non-orthogonal multiple access systems in 5G networks
TL;DR: In this article , user pairing and power allocation are proposed as a hybrid scheme to maximize throughput and achieve system fairness in the downlink NOMA system in 5G networks, where integer linear programming is applied to perform user pairing, and particle swarm optimisation is used for power allocation.
Journal ArticleDOI
Outage Analysis of Sparse Vector Coding based Downlink Multicarrier NOMA for URLLC
TL;DR: In this article , a sparse vector coding (SVC) based downlink MCNOMA system is considered and first it is shown that SVC-MCN OMA is free from inter-carrier interference due to the sparse nature of the information.
Journal ArticleDOI
Limited Feedback-Based User Clustering for Non-Orthogonal Multiple Access in mmWave Systems
Thanh N. Nguyen,Taehyun Jeon +1 more
TL;DR: In this paper, the authors proposed to use the angle of departure (AoD) as feedback information from UEs to the BS to improve the spectral efficiency of NOMA.
Proceedings ArticleDOI
Intelligent Energy-Efficient Power Allocation for Uplink NOMA Systems
TL;DR: In this article , a power allocation optimization problem without compromising each user's quality of service (QoS) constraints is formulated, and the Whale Optimization Algorithm (WOA) is proposed to tackle the formulated problem.
Journal ArticleDOI
Low Complexity Optimization of the Asymptotic Spectral Efficiency in Massive MIMO NOMA
TL;DR: In this paper, a power allocation algorithm for small-scale MIMO-NOMA systems is proposed to maximize the sum-capacity of the considered system, subject to power and performance constraints.
References
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Journal ArticleDOI
Non-orthogonal multiple access for 5G: solutions, challenges, opportunities, and future research trends
TL;DR: The concept of software defined multiple access (SoDeMA) is proposed, which enables adaptive configuration of available multiple access schemes to support diverse services and applications in future 5G networks.
Journal ArticleDOI
Fair end-to-end window-based congestion control
Jeonghoon Mo,Jean Walrand +1 more
TL;DR: The existence of fair end-to-end window-based congestion control protocols for packet-switched networks with first come-first served routers is demonstrated using a Lyapunov function.
Journal ArticleDOI
Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges
TL;DR: This paper comprehensively surveys the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NomA.
Journal ArticleDOI
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.
Journal ArticleDOI
Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges
TL;DR: In this paper, the authors comprehensively survey the recent progress of NOMA in 5G systems, reviewing the state-of-the-art capacity analysis, power allocation strategies, user fairness, and user-pairing schemes in NOMAs.