On Optimal Power Allocation in Multibeam Multicast NOMA for Satellite Communication Systems

This paper addresses two key challenges in the multibeam multicast non-orthogonal multiple access (MB-MC-NOMA) scheme and respective beamforming design problems in satellite systems. Achieving the max-min fairness (MMF) and maximum sum-rate among multiple multicast groups of users are jointly consid...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems 2023-10, Vol.59 (5), p.1-20
Main Authors: Ivari, Sareh Majidi, Beigi, Nazli Ahmad Khan, Soleymani, M. Reza, Shayan, Yousef
Format: Article
Language:English
Subjects:
Achievable rate region
Algorithms
Beamforming
Communications systems
linear precoding
max-min fairness
multicast NOMA
Multicasting
NOMA
Nonorthogonal multiple access
Optimization
Precoding
Receivers
Satellite broadcasting
Satellite communications
Signal to noise ratio
sum-rate maximization
Superposition (mathematics)
Transmitters
user scheduling
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Summary:This paper addresses two key challenges in the multibeam multicast non-orthogonal multiple access (MB-MC-NOMA) scheme and respective beamforming design problems in satellite systems. Achieving the max-min fairness (MMF) and maximum sum-rate among multiple multicast groups of users are jointly considered in a theoretical information framework. It is assumed that each frame contains information of multiple users in multicast transmission. Therefore, contrary to the unicast linear precoding, we have developed the multicast linear precoding with mapping function considering trade-offs to deal with the lack of the spatial degree of freedom. In our proposed scheme, each beamforming vector conveys information to more than one group of users in a NOMA framework, relying on the superposition techniques at the transmitters and successive interference cancellation (SIC) at the receivers. We have derived the capacity rates achievable in each beam, proposing the methods to maximize the minimum rate and weighted sum-rate. Considering the dependency of the broadcasting power and the respective achievable rates, the equivalent channel and water-filling algorithm for the MB-MC-NOMA is developed; as such, the optimal transmit power density for the groups of users within multiple beams are efficiently computed. The extensive simulation results confirm the proposed theoretical findings, providing a considerable boost in both minimum-rate and sum-rate with respect to state-of-the-art multibeam multicast satellite systems.
ISSN:0018-9251
1557-9603
DOI:10.1109/TAES.2023.3287475