A design technique for a 60 GHz-bandwidth distributed baseband amplifier IC module. - Tsugumichi Shibata; Shunji Kimura; Hideaki Kimura 002; Yuhki Imai; Yohtaro Umeda; Yukio Akazawa (IEEE J. Solid State Circuits, 1994)

Over-30-GHz limiting amplifier ICs with small phase deviation for optical communication systems. - Makoto Nakamura; Yuhki Imai; Shoji Yamahata; Yohtaro Umeda (IEEE J. Solid State Circuits, 1996)

40-Gb/s ICs for future lightwave communications systems. - Taiichi Otsuji; Yuhki Imai; Eiichi Sano; Shunji Kimura; Satoshi Yamaguchi; Mikio Yoneyama; Takatomo Enoki; Yohtaro Umeda (IEEE J. Solid State Circuits, 1997)

An 80-Gbit/s multiplexer IC using InAlAs/InGaAs/InP HEMTs. - Taiichi Otsuji; Koichi Murata; Takatomo Enoki; Yohtaro Umeda (IEEE J. Solid State Circuits, 1998)

1.25-Gb/s burst-mode receiver ICs with quick response for PON systems. - Makoto Nakamura; Yuki Imai; Yohtaro Umeda; Jun Endo; Yuji Akatsu (IEEE J. Solid State Circuits, 2005)

Frequency rotation for suppressing path interference and achieving large frequency diversity in uplink IFDMA. - Osamu Takyu; Yohtaro Umeda; Masao Nakagawa (PIMRC, 2008)

A study of cooperative communication with consideration of power loss caused by relay abortion. - Mayumi Suzuki; Osamu Takyu; Yohtaro Umeda (ISWCS, 2009)

Scattered Pilot Assisted Channel Estimation for IFDMA Uplink. - Takeo Yamasaki; Osamu Takyu; Yohtaro Umeda (IEICE Trans. Commun., 2009)

Frequency Rotation for Suppressing Multipath Interference and Achieving Large Frequency Diversity in Uplink IFDMA. - Osamu Takyu; Yohtaro Umeda; Masao Nakagawa (IEICE Trans. Commun., 2010)

Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication. - Takeo Yamasaki; Osamu Takyu; Koichi Adachi; Yohtaro Umeda; Masao Nakagawa (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2010)

On Physical Layer Simulation Model for 6-Axis Sensor Assisted VLC Based Positioning System. - Chinnapat Sertthin; Takeo Fujii; Osamu Takyu; Yohtaro Umeda; Tomoaki Ohtsuki (GLOBECOM, 2011)

A nearest transmitter classification method for VLC based positioning system. - Chinnapat Sertthin; Tomoaki Ohtsuki; Osamu Takyu; Takeo Fujii; Yohtaro Umeda (PIMRC, 2011)

Fundamental study on adaptive ACK link control for downloading based on TCP connection in mobile wireless communication. - Osamu Takyu; Yohsuke Seki; Takeo Yamasaki; Takeo Fujii; Yohtaro Umeda; Xiaoqiu Wang; Satoshi Konishi (PIMRC, 2011)

Performance for MAC Level Channel Capacity in Cognitive Radio with Carrier Sense Multiple Access and Transmitting Power Control. - Osamu Takyu; Takahiro Saiwai; Takeo Fujii; Yohtaro Umeda (VTC Fall, 2011)

Power-amplifier-inserted transversal filter for application to pulse-density-modulation switching-mode transmitters. - Shota Fujioka; Michiaki Kojima; Hironori Izumi; Yohtaro Umeda; Osamu Takyu (ISCIT, 2012)

Theoretical analysis of resource block assignment based on PAPR in two base station cellular system. - Osamu Takyu; Yohtaro Umeda; Fumihito Sasamori; Shiro Handa (PIMRC, 2012)

Optimal subcarrier assignment for single cell multiuser OFDM system. - Osamu Takyu; Yohtaro Umeda (RWS, 2012)

Variable multi-pulse PPM using new dimming control method for visible light communications. - Takashi Ozaki; Yusuke Kozawa; Yohtaro Umeda (ISITA, 2014)

Improved error performance of variable PPM for visible light communication. - Takashi Ozaki; Yusuke Kozawa; Yohtaro Umeda (WPMC, 2014)

Resource Block Assignment to Reduce Peak to Average Power Ratio in Multi-User OFDM. - Osamu Takyu; Yohtaro Umeda; Fumihito Sasamori; Shiro Handa (IEICE Trans. Commun., 2014)

Performance evaluation of Digital Colour Shift Keying for visible light communications. - Naoya Murata; Hiroki Shimamoto; Yusuke Kozawa; Yohtaro Umeda (ICC Workshops, 2015)

An experimental evaluation on EVM performance for 4-CSK(Color Shift Keying) using visible light with multiple full-color LEDs. - Hiroki Shimamoto; Yusuke Kozawa; Yohtaro Umeda (RWS, 2015)

Performance Evaluation of Multiuser Digital Color Shift Keying Using Pseudo-Noise Code with On-Off Signaling. - Fuminori Sato; Yusuke Kozawa; Yohtaro Umeda (CANDAR, 2016)

BER performance of digital color shift keying with target color control. - Shunsuke Igata; Yusuke Kozawa; Yohtaro Umeda; Hiromasa Habuchi (ICSPCS, 2016)

Inverse pulse position modulation schemes for simultaneous visible light wireless information and power transfer. - Ryota Kimoto; Yusuke Kozawa; Yohtaro Umeda; Hiromasa Habuchi (ITNAC, 2017)

Quadrature-modulation envelope-pulse-width-modulation transmission system using quadrature polarized waves. - Ryo Sakai; Tomoaki Morita; Yohtaro Umeda; Yusuke Kozawa (MWSCAS, 2017)

Cyclic mapping method for digital color shift keying with RGB-LED array. - Yusuke Matsuda; Yusuke Kozawa; Yohtaro Umeda (RWS, 2017)

Comparison between Quadrature-modulation EPWM transmitters with a 90° and 180° hybrid in physical models. - Tomoaki Morita; Yohtaro Umeda (ICECS, 2018)

Power-amplifier-inserted Transversal Filter that Recovers Quantization Noise Power by CMOS Rectifier. - Yuto Tanaka; Yohtaro Umeda; Kyoya Takano (ICECS, 2018)

Hybrid PWM/DPAM Dimming Control for Digital Color Shift Keying Using RGB-LED Array. - Jumpei Okumura; Yusuke Kozawa; Yohtaro Umeda; Hiromasa Habuchi (IEEE J. Sel. Areas Commun., 2018)

A 76-Gbit/s 265-GHz CMOS Receiver. - Shinsuke Hara; Ruibing Dong; Sangyeop Lee; Kyoya Takano; Naoya Toshida; Satoru Tanoi; Tatsuo Hagino; Mohamed H. Mubarak; Norihiko Sekine; Issei Watanabe; Akifumi Kasamatsu; Kunio Sakakibara; et al. (A-SSCC, 2021)

Frequency-Interleaved ADC with RF Equivalent Ideal Filter for Broadband Optical Communication Receivers. - Ryo Kabeya; Yohtaro Umeda; Kyoya Takano (ICECS, 2021)

DAC Bandwidth Tripler with 3: 1 Image-Rejection Analog Multiplexer. - Yusuke Yokoi; Yusuke Takai; Joe Sawada; Takumi Kamo; Yohtaro Umeda; Kyoya Takano (ICECS, 2021)

Design of an Area-Efficient Differential Distributed Amplifier Based on the Theory of Differential Transmission Lines. - Keisuke Kawahara; Yohtaro Umeda; Kyoya Takano (ISCAS, 2021)

A Broadband Active Balun with Inductor-Less Active Peaking and Imbalance Correction. - Keisuke Kawahara; Yohtaro Umeda; Kyoya Takano (MWSCAS, 2021)

A 50 Gbps 49 mW CMOS Analog Multiplexer for a DAC Bandwidth Tripler. - Keisuke Kawahara; Joe Sawada; Takumi Kamo; Yohtaro Umeda; Kyoya Takano (RWS, 2022)

39 - 67 GHz CMOS Multistage Power Amplifier With Two-Way Power Stage. - Sho Okii; Shinsuke Hara; Akifumi Kasamatsu; Yohtaro Umeda; Kyoya Takano (ICICDT, 2023)

A 0.0058-mm2 Inductor-Less CMOS Active Balun With Gain and Phase Errors Within -0.1 ± 0.2 dB and -0.18 ± 1.17° From DC to 8 GHz. - Keisuke Kawahara; Yohtaro Umeda; Kyoya Takano; Shinsuke Hara (IEEE Trans. Circuits Syst. I Regul. Pap., 2023)

A Compact Fully-Differential Distributed Amplifier with Coupled Inductors in 0.18-µm CMOS Technology. - Keisuke Kawahara; Yohtaro Umeda; Kyoya Takano; Shinsuke Hara (IEICE Trans. Electron., 2023)