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Space-Time Rate-Splitting Multiple Access for Multibeam LEO Satellite Networks

Jaehyup Seong, Byungju Lee, Aryan Kaushik, Wonjae Shin

Abstract

This paper proposes a novel space-time rate-splitting multiple access (ST-RSMA) framework for multibeam low Earth orbit (LEO) satellite communications (SATCOM) systems, where space-time coding is integrated into the common stream transmission. This design enables full diversity gain in the common stream transmission for all users, regardless of the uncertainty of the channel state information (CSI) and network load conditions, thereby overcoming the performance limitations of conventional RSMA that employs a single beamforming vector for all users. To further enhance performance, we develop a weighted minimum mean square error (WMMSE)-based algorithm tailored to ST-RSMA that jointly optimizes the power allocation for the common stream and the power/beamforming vectors for private streams, aiming to maximize the minimum user rate. Numerical results show that ST-RSMA significantly outperforms conventional RSMA and other multiple access techniques, offering a robust and scalable solution for LEO SATCOM.

Space-Time Rate-Splitting Multiple Access for Multibeam LEO Satellite Networks

Abstract

This paper proposes a novel space-time rate-splitting multiple access (ST-RSMA) framework for multibeam low Earth orbit (LEO) satellite communications (SATCOM) systems, where space-time coding is integrated into the common stream transmission. This design enables full diversity gain in the common stream transmission for all users, regardless of the uncertainty of the channel state information (CSI) and network load conditions, thereby overcoming the performance limitations of conventional RSMA that employs a single beamforming vector for all users. To further enhance performance, we develop a weighted minimum mean square error (WMMSE)-based algorithm tailored to ST-RSMA that jointly optimizes the power allocation for the common stream and the power/beamforming vectors for private streams, aiming to maximize the minimum user rate. Numerical results show that ST-RSMA significantly outperforms conventional RSMA and other multiple access techniques, offering a robust and scalable solution for LEO SATCOM.
Paper Structure (6 sections, 19 equations, 3 figures, 1 algorithm)

This paper contains 6 sections, 19 equations, 3 figures, 1 algorithm.

Table of Contents

  1. Introduction
  2. System Model and Problem Formulation
  3. Proposed Space-Time RSMA Precoder Design
  4. Extension to Increased Number of Antennas
  5. Performance Evaluation
  6. Conclusion and Future Directions

Figures (3)

  • Figure 1: System model of the proposed ST-RSMA scheme for LEO SATCOM.
  • Figure 2: Minimum spectral efficiency comparisons under various system settings: (a) As a function of $\sigma_{\sf{e}}$ with $N_{\sf{t}}$ = 2 and $K$ = 20; (b) As a function of $K$ with $N_{\sf{t}}$ = 2 and $\sigma_{\sf{e}}$ = 2; (c) As a function of $N_{\sf{t}}$ with $\sigma_{\sf{e}}$ = 1, for $K$ = 12 (upper subplot) and $K$ = 24 (lower subplot).
  • Figure 3: (a) Minimum spectral efficiency comparison as a function of SNR with $N_{\sf{t}}=2$ and $\sigma_{\sf{e}}=1$, for $K$ = 12 and $K$ = 24; (b) Achievable spectral efficiency comparison as a function of $\sigma_{\sf{e}}$ with $N_{\sf{t}}$ = 2 and $K$ = 24; (c) Convergence comparison under $N_{\sf{t}} = 2$ and $\sigma_{\sf{e}}$ = 1, for $K$ = 12 and $K$ = 24.

Theorems & Definitions (2)

  • Remark 1
  • Remark 2