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arXiv · 2508.11132

Multi-Satellite Cooperative MIMO Transmission: Statistical CSI-Aware RSMA Precoding Design

Sangwon Jo·Seok-Hwan Park
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Abstract

We investigate inter-satellite cooperative transmission in a multiple low-Earth orbit (LEO) satellite communication system to enhance spectral efficiency. Specifically, we design multiple-input multipleoutput (MIMO) precoding at LEO satellites for cooperative rate-splitting multiple access (RSMA). Given the difficulty of acquiring instantaneous channel state information (iCSI) due to long delays and Doppler effects, we formulate an ergodic max-min fairness rate (MMFR) maximization problem based on statistical CSI (sCSI). To address the challenge of ergodic rate evaluation, we approximate the problem using closed-form upper bounds and develop a weighted minimum mean squared error-based algorithm to obtain a stationary point. Simulation results demonstrate that the proposed sCSI-based RSMA scheme approaches iCSI-based performance and significantly outperforms conventional space-division multiple access.

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Sangwon Jo, Seok-Hwan Park. 2025-08-15. Multi-Satellite Cooperative MIMO Transmission: Statistical CSI-Aware RSMA Precoding Design. https://arxiv.org/abs/2508.11132

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