Holographic MIMO Communications with Orbital Angular Momentum and Polarization Multiplexing - Ullah, Arif; Abbasi, M. Ali Babar; Yurduseven, Okan; Ngo, Hien Quoc (2026 40th International Conference on Information Networking (ICOIN), Information Networking (ICOIN), 2026 40th International Conference on, 2026)