Zaid Albataineh Haythem Bany Salameh Mohammad Al Bataineh 0001 Two-Stage Power Allocation for IRS-Assisted Downlink NOMA: Intra-Group Optimization and Inter-Group Allocation. 90052-90062 2025 13 IEEE Access https://doi.org/10.1109/ACCESS.2025.3570120 db/journals/access/access13.html#AlbatainehSB25 streams/journals/access