NDLI: Dynamic resource allocation for uplink non-orthogonal multiple access systems

Content Provider	IET Digital Library
Author	Lv, Guocheng Li, Xunan Shang, Ruibo Xue, Ping Jin, Ye
Abstract	This study investigates a problem of resource allocation for an uplink multi-carrier non-orthogonal multiple access (NOMA) system. To provide a general resource allocation problem, the order of successive interference cancellation (SIC), subcarrier assignment and power allocation are all considered as the optimisation variables of interest, with the objective of maximising the weighted sum rate under the transmit power constraint of each user equipment (UE). Firstly, a novel optimal SIC order is proposed based on the inherent structure of the uplink NOMA system. Then, with the optimal SIC order, the Lagrange dual method is employed to solve the joint subcarrier assignment and power allocation problem in an asymptotically optimal manner. In addition, an optimal solution of power allocation with a fixed subcarrier assignment is presented. In light of the optimal power allocation, a tight upper bound of the uplink NOMA system is developed by relaxing the number of multiplexed UEs on each subcarrier. Simulation results show that the proposed algorithm outperforms conventional orthogonal multiple access schemes and other static NOMA schemes, and as a benchmark, the upper bound reveals that multiplexing at most two UEs on each subcarrier is sufficient for the performance improvement.
Starting Page	649
Ending Page	655
Page Count	7
ISSN	17518628
Volume Number	12
e-ISSN	17518636
Issue Number	Issue 6, Apr (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2017.0972
Journal	IET Communications
Publisher Date	2018-01-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	5G Mobile Communication 5G Mobile Communications Dynamic Resource Allocation Electromagnetic Compatibility Fixed Subcarrier Assignment Interference Interference Suppression Joint Subcarrier Assignment And Power Allocation Problem Lagrange Dual Method Mobile Radio System Multi-access System Multiple Access Communication Multiplexing Optimal SIC Order Optimisation Optimisation Technique Optimisation Variables Radio Frequency Interference Resource Allocation Successive Interference Cancellation Transmit Power Constraint Uplink Multicarrier Nonorthogonal Multiple Access System Uplink NOMA System User Equipment Weighted Sum Rate Maximisation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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