A direct digital synthesizer with interpolation circuits. - Tadao Nakagawa; Hideyuki Nosaka (IEEE J. Solid State Circuits, 1997)

Authors' Reply. - Tadao Nakagawa; Hideyuki Nosaka (IEEE J. Solid State Circuits, 1998)

Sampling phase detector using a resonant tunneling high electron mobility transistor for microwave phase-locked oscillators. - Hiroshi Okazaki; Tadao Nakagawa; Masahiro Muraguchi; Hiroyuki Fukuyama; Koichi Maezawa; Masafumi Yamamoto (IEEE Trans. Very Large Scale Integr. Syst., 1998)

Compensation technique for impairments of wideband quadrature demodulators for direct conversion receivers. - Munehiro Matsui; Tadao Nakagawa; Kiyoshi Kobayashi; Katsuhiko Araki (PIMRC, 2004)

A Novel Adaptive Linearization Technique for a Balanced-Amplifier Array. - Takana Kaho; Yo Yamaguchi; Tadao Nakagawa; Katsuhiko Araki; Kiyomichi Araki (IEICE Trans. Electron., 2006)

An Active Terminal Circuit and Its Application to a Distributed Amplifier. - Hitoshi Hayashi; Munenari Kawashima; Tadao Nakagawa; Kazuhiro Uehara; Yoshihiro Takigawa (IEICE Trans. Electron., 2007)

Miniaturized Broadband Lumped-Element In-Phase Power Dividers. - Hitoshi Hayashi; Tadao Nakagawa; Kazuhiro Uehara; Yoshihiro Takigawa (IEICE Trans. Electron., 2007)

A Miniaturized In-Phase Power Divider with a DC Block Function. - Hitoshi Hayashi; Tadao Nakagawa; Kazuhiro Uehara; Yoshihiro Takigawa (IEICE Trans. Electron., 2007)

Intermodal group velocity dispersion of few-mode fiber. - Hirokazu Kubota; Hidehito Takara; Tadao Nakagawa; Munehiro Matsui; Toshio Morioka (IEICE Electron. Express, 2010)

An Analysis of Multi-Layer Inductors for Miniaturizing of GaAs MMIC. - Yo Yamaguchi; Takana Kaho; Motoharu Sasaki; Kenjiro Nishikawa; Tomohiro Seki; Tadao Nakagawa; Kazuhiro Uehara; Kiyomichi Araki (IEICE Trans. Electron., 2010)

Blind frequency-dependent IQ imbalance compensation scheme using CMA for OFDM system. - Munehiro Matsui; Tadao Nakagawa; Riichi Kudo; Koichi Ishihara; Masato Mizoguchi (PIMRC, 2011)

A Band-Divided Receiver Prototype for Wideband Optical Signals. - Munehiro Matsui; Riichi Kudo; Yasushi Takatori; Tadao Nakagawa; Koichi Ishihara; Masato Mizoguchi; Takayuki Kobayashi; Yutaka Miyamoto (IEICE Trans. Commun., 2011)

Performance Evaluation of Short-Range MIMO Using a Method for Controlling Phase Difference between Each Propagation Channel. - Kazumitsu Sakamoto; Ken Hiraga; Tomohiro Seki; Tadao Nakagawa; Kazuhiro Uehara (IEICE Trans. Commun., 2013)

Performance measurement of broadband simple decoding in short-range MIMO. - Ken Hiraga; Kazumitsu Sakamoto; Tomohiro Seki; Toshimitsu Tsubaki; Hideki Toshinaga; Tadao Nakagawa (PIMRC, 2014)

Spatial Division Transmission without Signal Processing for MIMO Detection Utilizing Two-Ray Fading. - Ken Hiraga; Kazumitsu Sakamoto; Maki Arai; Tomohiro Seki; Tadao Nakagawa; Kazuhiro Uehara (IEICE Trans. Commun., 2014)

A Study of Short-Range MIMO Transmission Utilizing Polarization Multiplexing for the Simplification of Decoding. - Ken Hiraga; Kazumitsu Sakamoto; Kentaro Nishimori; Tomohiro Seki; Tadao Nakagawa; Kazuhiro Uehara (IEICE Trans. Commun., 2014)

A Practical channel modeling method for few-mode optical fiber communication systems. - Doohwan Lee; Kohki Shibahara; Tadao Nakagawa; Yutaka Miyamoto; Chitradeep Majumdar (APCC, 2015)

Experimental Validation of Digital Pre-distortion Technique for Dual-band Dual-signal Amplification by Single Feedback Architecture Employing Dual-band Mixer. - Ikuma Ando; Gia Khanh Tran; Kiyomichi Araki; Takayuki Yamada; Takana Kaho; Yo Yamaguchi; Tadao Nakagawa (IEICE Trans. Electron., 2015)

Concurrent Multi-Band Mixer with Independent and Linear Gain Control. - Takana Kaho; Yo Yamaguchi; Hiroyuki Shiba; Tadao Nakagawa; Kazuhiro Uehara; Kiyomichi Araki (IEICE Trans. Electron., 2015)

A Novel ZF-Based Fast Beamforming Method for Short-Range MIMO Transmission. - Kazumitsu Sakamoto; Maki Arai; Ken Hiraga; Tomohiro Seki; Toshimitsu Tsubaki; Hideki Toshinaga; Tadao Nakagawa (IEEE Wirel. Commun. Lett., 2015)

A Frequency Synchronization Method for Multiple Access in Direct Spectrum Division Transmission. - Jun-ichi Abe; Tadao Nakagawa (GLOBECOM, 2016)

Channel prediction for massive MIMO with channel compression based on principal component analysis. - Rei Nagashima; Tomoaki Ohtsuki; Wenjie Jiang 002; Yasushi Takatori; Tadao Nakagawa (PIMRC, 2016)

Alignment Tolerance in Multiple-Stream Transmission Using Orthogonal Directivities under Line-of-Sight Environments. - Maki Arai; Tomohiro Seki; Ken Hiraga; Kazumitsu Sakamoto; Tadao Nakagawa (IEICE Trans. Commun., 2016)

Orthogonalized Directional MIMO Transmission Using Higher Order Mode Microstrip Antennas. - Maki Arai; Tomohiro Seki; Ken Hiraga; Kazumitsu Sakamoto; Hideki Toshinaga; Tadao Nakagawa (IEICE Trans. Commun., 2016)

Wide-Range and Fast-Tracking Non-Data-Aided Frequency Offset Estimator for QAM Optical Coherent Receivers. - Tadao Nakagawa; Takayuki Kobayashi; Koichi Ishihara; Yutaka Miyamoto (IEICE Trans. Commun., 2016)

Q-learning based superposed band detection in multicarrier transmission. - Ali Shaikh; Fereidoun H. Panahi; Tomoaki Ohtsuki; Kouhei Suzaki; Hirofumi Sasaki; Hideya So; Tadao Nakagawa (ICC, 2017)

Orbital Angular Momentum (OAM) Multiplexing: An Enabler of a New Era of Wireless Communications. - Doohwan Lee; Hirofumi Sasaki; Hiroyuki Fukumoto; Ken Hiraga; Tadao Nakagawa (IEICE Trans. Commun., 2017)

Throughput Enhancement for SATCOM Systems Using Dynamic Spectrum Controlled Channel Allocation under Variable Propagation Conditions. - Katsuya Nakahira; Jun Mashino; Jun-ichi Abe; Daisuke Murayama; Tadao Nakagawa; Takatoshi Sugiyama (IEICE Trans. Commun., 2017)

Joint Interference Alignment and Power Allocation for Multi-User MIMO Interference Channels Under Perfect and Imperfect CSI. - Fereidoun H. Panahi; Tomoaki Ohtsuki; Wenjie Jiang 002; Yasushi Takatori; Tadao Nakagawa (IEEE Trans. Green Commun. Netw., 2017)

A Low-Complexity High-Accuracy AR Based Channel Prediction Method for Interference Alignment. - Masayoshi Ozawa; Tomoaki Ohtsuki; Fereidoun H. Panahi; Wenjie Jiang 002; Yasushi Takatori; Tadao Nakagawa (GLOBECOM, 2018)