Geographical NOMA-Beamforming in Multi-Beam Satellite-Based Internet of Things

被引：1
作者：
Zhu, Yazhou [1 ]
Delamotte, Thomas [1 ]
Knopp, Andreas [1 ]
机构：
[1] Bundeswehr Univ Munich, Chair Signal Proc, D-85579 Neubiberg, Germany
来源：
2019 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM) | 2019年
关键词：
satellite-based IoT; geographical NOMA-BF; user scheduling; multi-layer beamforming; power allocation;
D O I：
10.1109/globecom38437.2019.9013777
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this paper, a geographical non-orthogonal multiple access based multiuser beamforming (NOMA-BF) scheme is investigated to improve spectral efficiency in multi-beam satellite-based Internet of Things (IoT), where the primary user per beam needs to be timely served with a small targeted data rate while other users per beam are opportunistically served by using the NOMA concept. We first design a novel user scheduling to enhance spectrum efficiency. Then, a multi-layer beamforming (BF) is developed to mitigate inter-beam interference, augment the difference of the effective channel gains of the users, and perform inter-beam power allocation in a separate manner. Additionally, a dynamic intra-beam power allocation policy is conceived to further improve spectrum efficiency, while meeting predefined target data rates of the primary NOMA users. Numerical results show the capability of our proposal.
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页数：6
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