NDLI: Resource optimisation for downlink non-orthogonal multiple access systems: a joint channel bandwidth and power allocations approach

Content Provider	IET Digital Library
Author	Wu, Yuan Mao, Haowei Ni, Kejie Feng, Xu Qian, Liping Huang, Liang Shi, Zhiguo
Abstract	The emerging non-orthogonal multiple access (NOMA) has been considered as a promising scheme to reach the goals of 5G cellular systems. By enabling a group of mobile users (MUs) to share a same frequency channel and adopting the successive interference cancellation to mitigate the co-channel interference, NOMA can improve the spectrum efficiency compared with the orthogonal multiple access (OMA). This study proposes a joint optimisation scheme of the channel bandwidth and the transmit-power allocations for the NOMA downlink transmission, which aims at minimising the overall resource consumption cost including both the spectrum consumption and the power consumption, while satisfying the MUs' traffic requirements. In spite of the non-convexity nature of the joint optimisation problem, this study characterises the connection between the channel bandwidth and the associated transmit powers for the MUs. Based on this connection, this study transforms the joint optimisation problem into an equivalent bandwidth optimisation problem, and further proposes an efficient algorithm to compute the optimal bandwidth allocation (which enables us to derive the corresponding transmit powers for the MUs). Extensive numerical results are provided to validate the proposed algorithm and the advantage of the proposed joint channel bandwidth and power allocations for the NOMA transmission.
Starting Page	2429
Ending Page	2437
Page Count	9
ISSN	17518628
Volume Number	12
e-ISSN	17518636
Issue Number	Issue 19, Dec (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/12/19
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2018.5157
Journal	IET Communications
Publisher Date	2018-08-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	5G Cellular Systems 5G Mobile Communication Bandwidth Allocation Cellular Radio Co-channel Interference Mitigation Cochannel Interference Concave Programming Conventional OMA-based Transmission Crowded Spectrum Resources Downlink Nonorthogonal Multiple Access System Electromagnetic Compatibility Equivalent Bandwidth Optimisation Problem Frequency Channel Interference Interference Suppression Joint Channel Bandwidth Joint Optimisation Problem Joint Optimisation Scheme Limited Spectrum ReSource Massive Connectivity Mobile Radio System Mobile User MU Traffic Requirements Multi-access System Multiple Access Communication NOMA Transmission NOMA-enabled Downlink Transmission NOMA-enabled Transmission Nonconvex Optimization Nonorthogonal Multiple Access Optimal Bandwidth Allocation Optimisation Technique Power Allocation Approach Power Consumption Cost Radio Spectrum Management Resource Allocation Resource Consumption Cost Resource Optimisation Spectrum Consumption Cost Spectrum Efficiency Successive Interference Cancellation Telecommunication Traffic Transmit-power Allocations Ultra-high Throughput Wireless Channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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