User Grouping and Optimal Random Beamforming in mmWave MIMO-NOMA Transmission Systems. - Mohammad Reza Ghavidel Aghdam; Seyyed Mahmoud Pishvaei; Reza Abdolee; Behzad Mozaffari Tazehkand; Farid Tabee Miandoab (WOWMOM, 2019)