non-orthogonal multiple

sliding mode control

leo satellite

ghg emissions

satellite communication

satellite networks

corneal_111100

leo satellite networks

satellite_39339

satellite-terrestrial

neighbourhood_76299

earth orbit

satellite_133730

hens_30756

practitioner

industry_44025

stanford

hydrographic

government agencies

IEEE Internet of Things Journal

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.

Robust Design for NOMA-Based Multibeam LEO Satellite Internet of Things