An ISDN Subscriber Loop Transmission System Based on Echo Cancellation Technique. - Akira Kanemasa; Akihiko Sugiyama; Shin'ichi Koike; Tetsu Koyama (IEEE J. Sel. Areas Commun., 1986)

An ISDN echo-cancelling transceiver chip set for 2B1Q coded U-interface. - Yutaka Takahashi; Masahiro Takahara; Takayoshi Makabe; Daijiro Inami; Masahiko Ohno; Fujio Nakagawa; Tetsu Koyama; Akihiko Sugiyama; Masao Chatani; Renya Ikeda (IEEE J. Solid State Circuits, 1989)

Optimization of xDSL transmission systems. - Yusaku Okamura; Hiroshi Okado; Tetsu Koyama (ICC, 1999)

A multi-dimensional equalizer for Gigabit Ethernet. - Tetsu Koyama; Jason Peng; Paul Cohen (ICC, 2001)