GSVD-Based Uplink Channel Diagonalization in OTFS for Multi-User Systems - Omid Abbassi Aghda; Oussama Ben Haj Belkacem; Guerreiro, J.; Souto, N.; Michal Szczachor; Dinis, R. (International Conference on Localization and GNSS ICL-GNSS - WIPHAL’25 workshop, 2025)