A Stepped Square 256QAM for Digital Radio System. - Toshihiko Ryu; Junichi Uchibori; Yasuharu Yoshida (ICC, 1986)

6GHz 140Mbps Digital Radio Repeater with 256QAM Modulation. - Yasuharu Yoshida; Masato Tahara; Toshihiko Ryu (ICC, 1986)