A demodulation complexity reduction method using M-algorithm for high compaction multi-carrier modulation systems. - Shinji Takahashi; Masanori Hamamura; Shin'ichi Tachikawa (ISWCS, 2004)

Bandwidth efficiency improvement for multi-carrier systems. - Masanori Hamamura; Shin'ichi Tachikawa (PIMRC, 2004)

Special Section on Wide Band Systems. - Shin'ichi Tachikawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Asynchronous, Decentralized DS-CDMA Using Feedback-Controlled Spreading Sequences for Time-Dispersive Channels. - Teruhiko Miyatake; Kazuki Chiba; Masanori Hamamura; Shin'ichi Tachikawa (IEICE Trans. Commun., 2008)

A Combination of Adaptive Equalizer and LMS-RAKE Combining Scheme for DS-UWB System. - Keat Beng Toh; Shin'ichi Tachikawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

On Equalization for Direct Sequence-Ultra Wideband System Using Received Response Code Sequence. - Keat Beng Toh; Shin'ichi Tachikawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

Multiple Access Interference Reduction Using Received Response Code Sequence for DS-CDMA UWB System. - Keat Beng Toh; Shin'ichi Tachikawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2008)

MMFSK-EOD System Using Binary Hopping Pattern in FH/SS Communications. - Suguru Hasegawa; Shin'ichi Tachikawa; Gen Marubayashi (J. Commun., 2009)

A novel spreading sequence and its performances for code-diversity in DS/CDMA communication systems. - Hayato Noguchi; Shin'ichi Tachikawa (ISITA, 2012)

A novel interference suppression method using DFT in DS/CDMA communication systems. - Shin'ichi Tachikawa; Kenta Tsuna (APCC, 2013)

A novel design method of digital-digital sequences in DS/CDMA code-diversity systems. - Shin'ichi Tachikawa; Hiroki Sanada (ISPACS, 2016)