Energy Efficient Resource Allocation in Terahertz Downlink NOMA Systems

Terahertz (THz) band has attracted considerable interest recently due to its superior high frequency and large available bandwidth. THz could act a vital part in the sixth generation (6G) mobile communication networks. In this paper, we introduce the downlink non-orthogonal multiple access (NOMA) te...

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Bibliographic Details
Published in:IEEE transactions on communications 2021-02, Vol.69 (2), p.1375-1384
Main Authors: Zhang, Haijun, Duan, Yanan, Long, Keping, Leung, Victor C. M.
Format: Article
Language:English
Subjects:
Algorithms
Bandwidths
Communication networks
Downlink
Downlinking
Energy consumption
energy efficiency
Interference
Mobile communication systems
NOMA
Nonorthogonal multiple access
Optimization
power optimization
Resource allocation
Resource management
Signal to noise ratio
Silicon carbide
subchannel assignment
Terahertz frequencies
THz
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Summary:Terahertz (THz) band has attracted considerable interest recently due to its superior high frequency and large available bandwidth. THz could act a vital part in the sixth generation (6G) mobile communication networks. In this paper, we introduce the downlink non-orthogonal multiple access (NOMA) technology into THz band small cell networks, where the total performance is optimized considering the two key enabling technologies. In order to decrease the energy consumption triggered by increasing of wireless services, we pay great attention to energy efficiency (EE) optimization and resource allocation in the THz-NOMA downlink systems by solving the subchannel assignment and power optimization. We first exploit a channel model for the THz-NOMA downlink system by using the key features of THz-NOMA networks. Then we utilize Dinkelbach-style algorithm to solve the resource allocation problem and decompose it into two subproblems. A subchannel assignment algorithm and a power optimization based on alternative direction method of multipliers (ADMM) algorithm are developed to get the solution. Finally, to embody the strengths of THz-NOMA performance, we compare our proposed schemes against the conventional schemes. Simulation results yield substantially higher EE and further prove the availability of our proposed schemes.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2020.3037597