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:
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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A Survey of NOMA: Current Status and Open Research Challenges
TL;DR: Simulation comparisons between the Welch-bound equality spread multiple access (WSMA)-based NOMA and multi-user multiple-input-multiple-output (MU-MIMO) are presented, and a number of methods to reduce the implementation complexity and delay of both uplink (UL) and downlink (DL) N OMA-based transmission are proposed, as different ways to improve its efficiency.
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A Survey of Rate-Optimal Power Domain NOMA With Enabling Technologies of Future Wireless Networks
TL;DR: This paper surveys the different rate optimization scenarios studied in the literature when PD-NOMA is combined with one or more of the candidate schemes and technologies for B5G networks including multiple-input-single-output (MISO), multiple- input-multiple- Output (MIMO), massive-MIMo), advanced antenna architectures, higher frequency millimeter-wave (mmWave) and terahertz (THz) communications.
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Multiple Antenna Aided NOMA in UAV Networks: A Stochastic Geometry Approach
TL;DR: In this article, the outage probability and the ergodic rate of MIMO-NOMA-assisted UAV networks were derived by utilizing a stochastic geometry model.
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Resource Allocation for Ultra-Dense Networks: A Survey, Some Research Issues and Challenges
TL;DR: This paper provides a survey-style introduction to resource allocation approaches in UDNs and provides a taxonomy to classify the resource allocation methods in the existing literatures.
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UAV-Supported Clustered NOMA for 6G-Enabled Internet of Things: Trajectory Planning and Resource Allocation
TL;DR: A UAV-supported clustered nonorthogonal multiple access (C-NOMA) system that provides services to IoT terminals as an aerial BS based on the wireless-powered communication (WPC) technique and a synergetic scheme for UAV trajectory planning and subslot allocation is proposed.
References
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Journal ArticleDOI
Power and Channel Allocation for Non-orthogonal Multiple Access in 5G Systems: Tractability and Computation
TL;DR: In this article, the authors provide theoretical insights and algorithmic solutions to jointly optimize power and channel allocation in non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC) for utility maximization.
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On the Application of Quasi-Degradation to MISO-NOMA Downlink
TL;DR: A Hybrid NOMA (H-NOMA) precoding algorithm, based on the recently developed concept, quasi-degradation, is proposed, and a low-complexity sequential user pairing algorithm is consequently developed, to further improve the overall system performance.
Journal ArticleDOI
On the Sum Rate of MIMO-NOMA and MIMO-OMA Systems
TL;DR: Analysis of the performance of non-orthogonal multiple access over multiple-input multiple-output (MIMO) channels proves analytically that for a simple scenario of two users, MIMO-NOMA dominates MIMo-OMA in terms of both sum rate and ergodic sum rate.
Posted Content
NOMA in 5G Systems: Exciting Possibilities for Enhancing Spectral Efficiency
TL;DR: An overview of power-domain non-orthogonal multiple access for 5G systems is provided, along with current solutions and standardization activities and limitations and research challenges are discussed.
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Energy-Efficient Power Allocation for MIMO-NOMA With Multiple Users in a Cluster
TL;DR: Numerical results are presented to validate the effectiveness of the proposed energy-efficient PA strategy and user admission scheme, which admits users one by one following the ascending order of the required power for satisfying the QoS.