Field Experiments on Ultimate Frequency Efficiency Exceeding 30 Bit/Second/Hz Using MLD Signal Detection in MIMO-OFDM Broadband Packet Radio Access. - Hidekazu Taoka; Ki Dai; Kenichi Higuchi; Mamoru Sawahashi (VTC Spring, 2007)

Field Experiments on MIMO Multiplexing with Peak Frequency Efficiency of 50 Bit/Second/Hz Using MLD Based Signal Detection for OFDM High-Speed Packet Access. - Hidekazu Taoka; Ki Dai; Kenichi Higuchi; Mamoru Sawahashi (IEEE J. Sel. Areas Commun., 2008)

Development of Evolved Mobile Satellite Communications System; WIDESTAR II. - Kazuichi Yamamoto; Toshiyuki Kanekiyo; Ki Dai; Syuuichi Hayashi; Shinichi Sasaki; Kenji Kamogawa (GLOBECOM, 2011)