期刊
IEEE INTERNET OF THINGS JOURNAL
卷 8, 期 3, 页码 1959-1970出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2020.3015995
关键词
Satellites; Low earth orbit satellites; Satellite broadcasting; Robustness; NOMA; Array signal processing; Interference; Beyond fifth-generation (B5G); massive access; multibeam low-Earth orbit (LEO) satellite; nonorthogonal multiple access (NOMA); robust design; satellite Internet of Things (IoT)
资金
- Zhejiang Provincial Natural Science Foundation of China [LR20F010002]
- Natural Science Foundation of China [61871344, 61725104, 61922071]
- National Science and Technology Major Project of China [2018ZX03001017-002]
- National Key Research and Development Program of China [2018YFB1801104]
This article investigates massive access in a B5G multibeam LEO satellite IoT network using NOMA scheme and proposes robust beamforming algorithms against channel phase uncertainty to minimize total power consumption in different IoT application scenarios, demonstrating effective energy savings.
In this article, we investigate the issue of massive access in a beyond fifth-generation (B5G) multibeam low-Earth orbit (LEO) satellite Internet-of-Things (IoT) network in the presence of channel phase uncertainty due to channel-state information (CSI) conveyance from the devices to the satellite via the gateway. Rather than time-division multiple access (TDMA) or frequency-division multiple access (FDMA) with multicolor pattern, a new nonorthogonal multiple access (NOMA) scheme is adopted to support massive IoT distributed over a very wide range. Considering the limited energy on the LEO satellite, two robust beamforming algorithms against channel phase uncertainty are proposed for minimizing the total power consumption in the scenarios of noncritical IoT applications and critical IoT applications, respectively. Both theoretical analysis and simulation results validate the effectiveness and robustness of the proposed algorithms for supporting massive access in satellite IoT.
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