Path diversity for FFH/PSK spread-spectrum communication systems. - Yasushi Murata; Riaz Esmailzadeh; Keiji Takakusaki; Essam A. Sourour; Masao Nakagawa (IEEE J. Sel. Areas Commun., 1994)

Experiments on Frequency Error Compensation Using Synchronization Channel in OFDM Radio Access. - Hidekazu Taoka; Fumiaki Ito; Keiji Takakusaki; Mamoru Sawahashi (IEICE Trans. Commun., 2009)