Stacked Intelligent Metasurface Enabled LEO Satellite Communications Relying on Statistical CSI
IEEE Wireless Communications Letters(2024)
摘要
Low earth orbit (LEO) satellite communication systems have gained increasing
attention as a crucial supplement to terrestrial wireless networks due to their
extensive coverage area. This letter presents a novel system design for LEO
satellite systems by leveraging stacked intelligent metasurface (SIM)
technology. Specifically, the lightweight and energy-efficient SIM is mounted
on a satellite to achieve multiuser beamforming directly in the electromagnetic
wave domain, which substantially reduces the processing delay and computational
load of the satellite compared to the traditional digital beamforming scheme.
To overcome the challenges of obtaining instantaneous channel state information
(CSI) at the transmitter and maximize the system's performance, a joint power
allocation and SIM phase shift optimization problem for maximizing the ergodic
sum rate is formulated based on statistical CSI, and an alternating
optimization (AO) algorithm is customized to solve it efficiently.
Additionally, a user grouping method based on channel correlation and an
antenna selection algorithm are proposed to further improve the system
performance. Simulation results demonstrate the effectiveness of the proposed
SIM-based LEO satellite system design and statistical CSI-based AO algorithm.
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关键词
Stacked intelligent metasurface (SIM),LEO satellite,statistical CSI,antenna selection,user grouping
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