Open access
2026
HAP-Based Underlay Non-Terrestrial Networks With Imperfect CSI: Joint RSMA Transmission and Beyond-Diagonal RIS Beamforming
Simulation results demonstrate the effectiveness of the proposed framework and show that the BD-RIS-assisted system achieves up to a 45.2% sum-rate improvement compared with conventional single-connected RIS (SC-RIS) architectures while maintaining robustness against CSI uncertainty and satisfying all system constraints.
Zain Ali, Muhammad Asif, S. Althunibat et al.
· IEEE Access · 0 citations