Throughput based adaptive beamforming in 5G millimeter wave massive MIMO cellular networks via machine learning - Lavdas, Spyros; Gkonis, Panagiotis; Zinonos, Zinon; Trakadas, Panagiotis; Sarakis, Lambros (2022 IEEE 95th Vehicular Technology Conference:(VTC2022-Spring), 2022)