Transmitting null beam forming with beam space adaptive array antennas. - Isamu Chiba; Toshiyuki Takahashi; Yoshio Karasawa (VTC, 1994)

Digital signal processor for digital multi-beam forming antenna in mobile communication. - Toyohisa Tanaka; Isamu Chiba; Ryu Miura; Yoshio Karasawa (VTC, 1994)

On the capacity of cellular CDMA systems with multibeam antennas. - Yoshitaka Hara; Rumiko Yonezawa; Isamu Chiba (PIMRC, 1998)

Power inversion adaptive array antenna for high power interference suppression in DS-CDMA system. - Kazunari Kihira; Isamu Chiba (GLOBECOM, 2000)