Indoor Experimental Trial on Hybrid 16-Beam Spatial-Multiplexing for High SHF Wide-Band Massive MIMO in 5G. - Manabu Sakai; Kenji Nakagawa; Hiroki Iura; Naofumi Iwayama; Akihiro Okazaki; Nobuhide Nonaka; Satoshi Suyama; Jun Mashino; Atsushi Okamura; Yukihiko Okumura (VTC Fall, 2018)