Dr. Engineering, Kyoto University

工学博士, 京都大学

ITS

Wireless network

Radio circuit

Cellular phone

Mobile communications

Wireless communications

ワイヤレスネットワーク

無線回路

携帯電話

移動通信

ワイヤレス通信

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Communication and network engineering

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Electronic devices and equipment

01 Dec. 2005
The University of Electro-Communications, Professor, Advanced Wireless Conmmunication Research Center

Apr. 2004 - Nov. 2005
NTT DoCoMo Inc., Managing Director, Radio Systems Development Dept.

Apr. 2003 - Apr. 2004
NTT DoCoMo Inc., Senior Director, Wireless Laboratories

Jul. 2002 - Mar. 2003
NTT DoCoMo Inc., Senior Director on EMC and RF technologies, Wireless Labs.

Oct. 2000 - Jul. 2002
NTT DoCoMo Inc., Senior Director, Fourth Gen. Systems Laboratory, Wireless Labs.

Apr. 1977 - Mar. 1979
Graduate School of Kyoto University, Graduate School, Division of Engineering, 電子工学専攻

Jun. 2015 - May 2017
理事（企画担当）, 電子情報通信学会, Society

Jan. 2009 - Dec. 2015
IEEE VTS Japan Chapter Vice President, IEEE, Society

Jan. 2009 - Dec. 2015
IEEE VTS Japan Chapter Vice President, IEEE, Society

May 2008 - May 2010
通信ソサイエティ 和文マガジン編集委員長, 電子情報通信学会, Society

May 2006 - May 2008
無線通信システム研究専門委員会（RCS)専門委員長, 電子情報通信学会, Society

May 2008
無線通信システム研究専門委員会(RCS)顧問, 電子情報通信学会, Society

Dec. 2006 - Dec. 2007
通信ソサイエティサービス評価委員会委員長, 電子情報通信学会, Society

May 2005 - May 2006
無線通信システム研究専門委員会（RCS）専門委員, 電子情報通信学会, Society

May 2005 - May 2006
通信ソサイエティ評価委員会副委員長, 電子情報通信学会, Society

May 2003 - May 2006
ソフトウェア無線研究専門委員会（SR）専門委員, 電子情報通信学会, Society

May 2003 - May 2005
国際委員会委員, 電子情報通信学会, Society

May 2003 - May 2005
通信ソサイエティ副会長, 電子情報通信学会, Society

May 2001 - May 2003
無線通信システム研究専門委員会（RCS）副委員長, 電子情報通信学会, Society

May 2003
多次元移動情報ネットワーク学術研究集会 運営委員, 電子情報通信学会, Society

May 2000 - May 2001
無線通信システム研究専門委員会（RCS）専門委員, 電子情報通信学会, Society

May 1994 - May 1996
無線通信システム研究会（RCS）幹事, 電子情報通信学会, Society

Sep. 2009
IEICE
IEICE Fellow

Sep. 2008
電子情報通信学会
電子情報通信学会功労顕彰状

Unified Feedback Beamforming Digital Predistorter
Suguru Habu; Yasushi Yamao
Proc. of European Microwave Conference 2019, pp.---, Oct. 2019, Peer-reviwed
International conference proceedings, English

V2I Multi-Hop Broadcast Communication by TC-BF Method
Ryousuke Katsumata; Yasushi Yamao
Proc. of ICUFN2019, IEEE, -, -, Jul. 2019, Peer-reviwed
International conference proceedings, English

SHF-Band 3-bit Reconfigurable BPF Employing pHEMT Switch Arrays for 5G Multiband Operation
Yasushi Yamao; Naoto Akutsu
Proc. of EuMCE2019, IEEE, -, -, ---, May 2019, Peer-reviwed
International conference proceedings, English

SHF 3-bit Reconfigurable Band Rejection Filter Using Variable-Length λ/4 Anti-Resonators and LC Parallel Coupling
Yasushi Yamao; Naoto Akutsu
Proc. of EuMCE2019, IEEE, -, -, ---, May 2019, Peer-reviwed
International conference proceedings, English

5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells
Morihiko Minowa; Hiroyuki Seki; Yukihiko Okumura; Satoshi Suyama; Jun Terada; Satoshi Shigematsu; Yasushi Takatori; Hiroaki Asano; Yukio Hirano; Yasushi Yamao; Fumiyuki Adachi; Masataka Nakazawa
Proc. of VTC2019-Spring, IEEE, 5GPOC-5, May 2019, Peer-reviwed
International conference proceedings, English

Bandwidth-Efficient Blind Nonlinear Compensation of RF Receiver Employing Folded-Spectrum Sub-Nyquist Sampling Technique
Kan Kimura; Yasushi Yamao
IEICE Trans. Commun., IEICE, Vol. E102-B, 3, pp.632--640, Mar. 2019, Peer-reviwed
Scientific journal, English

Design of Dual-Band SHF BPF with Lower Band Reconfigurability and Direct Parallel-Connected Configuration
Yuki Kada; Yasushi Yamao
IEICE Trans. Electron., IEICE, Vol. E101-C, 10, pp.775-783, Oct. 2018, Peer-reviwed
Scientific journal, English

Information Delivery Delay Reduction by Relay-Assisted Broadcast Transmission for ITS V2V communications
Le Tien Trien; Yasushi Yamao
IEICE Trans. Fundamentals, IEICE, Vol. E101-A, 9, pp.1290-1297, Sep. 2018, Peer-reviwed
Scientific journal, English

Outband Radiation and Modulation Accuracy of Unified Beamforming DPD
Suguru Habu; Yasushi Yamao; Hiroyoshi Ishikawa; Toru Maniwa
Proc. of PIMRC2018, -, -, Sep. 2018, Peer-reviwed
International conference proceedings, English

Band-Split Parallel Signal Processing DPD for Nonlinear Compensation of Broadband RF Signal
Tomoki Abe; Yasushi Yamao
Proc. of ISWCS2018, -, -, 30 Aug. 2018, Peer-reviwed
International conference proceedings, English

Propagation Loss Characteristic of V2V Communication for Right-Turn Accident Prevention Scenario
Yosuke Kikuchi; Yasushi Yamao
PIERS 2018, The Electromagnetics Academy, -, -, 04 Aug. 2018, Peer-reviwed
International conference proceedings, English

Radio Propagation of 920MHz RFID on Metallic Storage Shelf
Sora Funayama; Yasushi Yamao
PIERS 2018, The Electromagnetics Academy, -, -, 04 Aug. 2018, Peer-reviwed
International conference proceedings, English

Throughput Analysis of Dynamic Multi-Hop Network Under High Traffic Load
Yusuke Sunada; Koichi Adachi; Yasushi Yamao
Proc. of ICUFN2018, P1, 2, Jul. 2018, Peer-reviwed
International conference proceedings, English

Packet relay-assisted V2V communication with sectorised relay station employing payload combining scheme
Le Tien Trien; Koichi Adachi; Yasushi Yamao
IET Communications, Institution of Engineering and Technology, 12, 4, 458-465, 06 Mar. 2018, Peer-reviwed, A reliable vehicle-to-vehicle communication (V2VC) is essential to enable safe and highly automated driving system. Addition of a relay station (RS) can improve packet delivery rate (PDR) of CSMA/CA-based V2VC. However, the improvement is limited by packet collision at RS due to a hidden terminal (HT). This HT problem can be alleviated by employing sectorised receive antenna at RS, i.e. sectorised relay-assisted (SR-) V2VC. However, SR-V2VC still faces another problem, i.e. packet congestion at RS under high traffic conditions due to the improved packet reception rate. This leads to packet drop at RS and hence limits the improvement brought by SR-V2VC. Consequently, it is crucial to introduce a kind of traffic congestion avoidance methods to RS. In this article, the authors propose SR-V2VC with a payload combining forwarding (PCF) method (SR-V2VC/ PCF) and theoretically evaluate the system performance using a CSMA/CA collision model. Large-scale computer simulations are also conducted to confirm the performance improvement brought by SR-V2VC/PCF. It is shown that the lowest broadcast PDR of 62% for the non-relay system is improved to higher than 81% by SR-V2VC/PCF and the directivity of the sector antenna has impact on the benefit of the proposed scheme.
Scientific journal, English

Network Coding Based Payload Concatenation for Relay-Assisted V2V Communications
Le Tien Trien; Koichi Adachi; Yasushi Yamao
IEICE ComEX, IEICE, 7, 4, 148-153, 09 Feb. 2018, Peer-reviwed
Scientific journal, English

Efficient CSMA/CA packet relay-assisted scheme with payload combining for ITS V2V communication
Le Tien Trien; Koichi Adachi; Yasushi Yamao
Journal of Information Processing, Information Processing Society of Japan, 26, Jan., 11-19, 01 Jan. 2018, Peer-reviwed, CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) based relay-assisted V2V scheme is effective in compensating shadowing loss and hence improves performance of ITS V2V communications, especially for non-line-of-sight (NLOS) areas such as intersections. However, when the number of vehicle stations becomes large, packet congestion happens frequently at the relay station (RS). It causes interruption of packet relaying transmission and limits the improvement by the scheme. This paper proposes a packet payload combining relay (PCRL) scheme to alleviate the congestion issue at RS by compressing packet overheads of broadcast packets. With adaptive modulation and coding technique at RS, PCRL can further mitigate the packet interruption by reducing the air time of relayed packets. Time division grouping method is also applied to PCRL to mitigate the hidden terminal problem at intersections. Analyzed and simulated results show that the proposed schemes can effectively mitigate packet congestion issue and improve the reliability of the V2V communication.
Scientific journal, English

Dual-Band SHF Reconfigurable Bandpass Filter Using λ/4 Microstrip Resonators and Chip Inductor Coupling
Yuki Kada; Yasushi Yamao
Proc. of RWS2018, IEEE, MO3B-1, Jan. 2018, Peer-reviwed
International conference proceedings, English

Received Power Threshold and Reply Timing Controlled Reactive Routing Scheme for Reliable Ad Hoc Network
Masahiro Hayashi; Yasushi Yamao
Proc. of APMC2017, P2-N12, Dec. 2017, Peer-reviwed
International conference proceedings, English

Spectrum-Folding Scalar-Feedback Architecture for Wideband DPD with Simple Feedback Circuit
Suguru Habu; Caoyu Li; Yasushi Yamao
Proc. of European Microwave Conference 2017, pp.1054-1057, Oct. 2017, Peer-reviwed
International conference proceedings, English

Blind Nonlinear Compensation for RF Receiver Employing Sub-Nyquist Sampling A/D Conversion
Kan Kimura; Yasushi Yamao
Proc. of VTC2017-Fall, IEEE, 9G-02, Sep. 2017, Peer-reviwed
International conference proceedings, English

Packet Relay-Assisted V2V Communication with Cooperative Relay Stations in Urban Environment
Le Tien Trien; Yasushi Yamao
Proc. of ITS European Congress 2017, SP0837, Jun. 2017, Peer-reviwed
International conference proceedings, English

Design of SHF 3-bit Reconfigurable Band Rejection Filter
Yusuke Imai; Yuki Kada; Yasushi Yamao
PIERS 2017, The Electromagnetics Academy, -, May 2017, Peer-reviwed
International conference proceedings, English

Composite Effect of E/O Nonlinearity and Optical Echo on EPWM-OFDM Transmission in Radio Over Fiber Channel
Xiaoxue Yu; Motoharu Matsuura; Yasushi Yamao
WIRELESS PERSONAL COMMUNICATIONS, SPRINGER, 93, 3, 647-660, Apr. 2017, Peer-reviwed, Radio over Fiber (RoF) is a promising technology for extending broadband wireless access to indoor and outdoor dead spots. However, commonly applied intensity-modulation / direct-detection RoF transmission presents some nonlinearity and produces echo distortion. Since multiple carrier modulation signals such as Orthogonal Frequency Division Multiplexing (OFDM) are widely employed in broadband wireless systems, the above issues become more serious. The OFDM signals have high Peak-to-Average Power Ratio, which makes them more sensitive to nonlinearity. Moreover, the large delay of optical echoes that are caused by the discontinuity of refractive index at both ends of Electrical/Optical (E/O) and Optical/Electrical converters exceeds the guard time of current OFDM symbols when the length of optical fiber is long. Since the nonlinearity and echo exist simultaneously in RoF channels, their composite effect is mathematically analyzed in this paper. A RoF-echo model is proposed for the modeling of the multiple light reflections and its validity is confirmed by experiments. Then, Envelop-Pulse-Width-Modulation- (EPWM-) RoF transmission is proposed for dealing with the nonlinearity and echo in RoF channel. The performance of the EPWM-RoF scheme for OFDM signal transmission is evaluated by simulations, which reveals that the scheme improves the transmission quality in Error Vector Magnitude under the composite environment of E/O nonlinearity and optical echo.
Scientific journal, English

A 3.1 to 4.6 GHz 3-bit Reconfigurable Bandpass Filter Using λ/4 Microstrip Resonators and Chip Inductor Coupling
Yuki Kada; Yasushi Yamao
Proc. of RWS2017, IEEE, WE3P-15, Jan. 2017, Peer-reviwed
International conference proceedings, English

Multi-Cell Harmonics and Intermodulation Compensation Architecture for Concurrent Dual-Band Transmitters
Caoyu Li; Yasushi Yamao; Songbai He
Proc. of RWS2017, IEEE, TU3P-2, Jan. 2017, Peer-reviwed
International conference proceedings, English

FPGA Design and Implementation of ANC-EPWM Transmitter
Takashi Funabashi; Yasushi Yamao
Proc. of TENCON 2016, IEEE, FR3A.CS1.5, 1359, Nov. 2016, Peer-reviwed
International conference proceedings, English

Delay Reduction by Relay-Assisted Broadcast Transmission for Dependable V2V communications
Yasushi Yamao; Le Tien Trien; Takeo Fujii; Koji Ishibashi
Proc. of ITS World Congress 2016, TP02-6, Oct. 2016, Peer-reviwed
International conference proceedings, English

Measured Separation of Sectorized Reception for ITS V2V Relay-Assisted Communication in Urban Environment
Le Tien Trien; Yasushi Yamao
Proc. of ISAP 2016, IEEE, 2F3-5, Oct. 2016, Peer-reviwed
International conference proceedings, English

Radio Propagation Loss Study by Hybrid Simulation for Smart Meter Communication in Apartment Building
Nodoka Nakagaki; Yasushi Yamao; Reina Nagayama; Takuya Kawata
Proc. of ISAP 2016, IEEE, 2D1-1, Oct. 2016, Peer-reviwed
International conference proceedings, English

Effect of Intra-Flow Interference Canceller for Large-Scale Ad Hoc Network
Jinze Dai; Yasushi Yamao
Proc. of ICUFN 2016, IEEE, 7E-1, Jul. 2016, Peer-reviwed
International conference proceedings, English

Packet Relay Assisted V2V Communication with Multiple Sectorized Relay Stations
Le Tien Trien; Yasushi Yamao
Proc. of VTC2016-Spring, IEEE, 10A-4, May 2016, Peer-reviwed
International conference proceedings, English

Bandwidth Deviation Controlled Reconfigurable Bandpass Filter Using LC Parallel Coupling Circuit
Takumi Kato; Ryosuke Kobayashi; Tetsunari Saito; Yasushi Yamao
Proc. of APMC2015, TU4E.3, Dec. 2015, Peer-reviwed
International conference proceedings, English

Wide Frequency Range Four-bit Reconfigurable Resonator Employing λ/2 and λ/4 Resonant Modes
Tetsunari Saito; Takumi Kato; Yasushi Yamao
Proc. of APMC2015, WE1H.15, Dec. 2015, Peer-reviwed
International conference proceedings, English

Performance Analysis of CSMA/CA Packet Relay Assisted V2V Communication with Sectorized Relay Station
Le Tien Trien; Yasushi Yamao
Proc. of VNC2015, IEEE, pp. 220-226, Dec. 2015, Peer-reviwed
International conference proceedings, English

Low-Power V2M Communication System with Fast Network Association Capability
Keisuke Hirose; Koji Ishibashi; Yasushi Yamao; Yasuhiro Hirayama; Manabu Sawada
Proc. of IEEE WF-IoT 2015, IEEE, pp. 204-209, Dec. 2015, Peer-reviwed
International conference proceedings, English

Highly Efficient Multi-Hop Packet Transmission Using Intra-Flow Interference Cancellation and Maximal-Ratio Combining
Jingze Dai; Koji Ishibashi; Yasushi Yamao
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 14, 11, 5998-6011, Nov. 2015, Peer-reviwed, Conventional Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) multi-hop transmission suffers severely from intra-flow interference (IFI) in dense traffic, due to the hidden terminal (HT) problem. We propose a non-CSMA/CA multi-hop transmission scheme with IFI-canceler (IFIC) that can efficiently relay packets under high traffic loads in fading environments. This interference cancellation technique employs adaptive equalization with a normalized least mean square (NLMS) algorithm for channel estimation and has good BER/PER performance under a wide range of SNR and SIR conditions. It is also capable of canceling multiple interference sources. A multi-hop packet transmission frame format dedicated to the IFIC proposal is designed. An analysis model is created that considers possible outage events in multi-hop traffic flows. Simulations of multi-hop transmission indicate that IFIC throughput under slow Rayleigh fading linearly increases with traffic load and is 3.5 times higher than that of current CSMA/CA systems at the highest normalized traffic load. When 2-branch maximal-ratio combining (MRC) reception is added after IC, the throughput is further improved to a level very close to the theoretical maximum for additive white Gaussian noise (AWGN) channels. We also assess the impact of maximum Doppler frequency, and show that the best performance is maintained if the frequency is less than 10 Hz and the performance under higher Doppler frequencies can be effectively improved by retransmission.
Scientific journal, English

Spectra-Folding Feedback Architecture for Concurrent Dual-Band Power Amplifier Predistortion
Yuelin Ma; Yasushi Yamao
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 63, 10, 3164-3174, Oct. 2015, Peer-reviwed, This paper proposes a spectra-folding feedback (SFFB) architecture for digital predistortion (DPD) of concurrent dual-band power amplifiers (PAs). Conventional dual-band DPD contains a dual-branch feedback path to receive the PA output signals at respective bands. The proposed architecture, however, is constructed by a single-branch receiving path, so that the hardware expense (such as down converters, filters, or analog-to-digital converters) of the feedback path is significantly reduced. In this architecture, simple modifications are made to the down converter to allow the use of only one analog-to-digital converter. With the proposed signal processing in the baseband, the SFFB DPD can achieve comparative performance as the conventional dual-branch DPD. Experiments were performed using various configurations of LTE/LTE-Advanced (long-term evolution/long-term evolution advanced) signals of up to 80 MHz contiguous bandwidth and carrier spacing of 1 GHz. It is clearly shown by the experimental results that the proposed SFFB DPD can achieve satisfactory linearization performance, with significantly reduced hardware complexity.
Scientific journal, English

Enhancing Throughput of Star Topology Sensor Network by Group Acknowledgement Method and MCR SS-CSMA/CA
Masaki Takamori; Yasushi Yamao
Proc. of APCC2015, pp. 343-347, Oct. 2015, Peer-reviwed
International conference proceedings, English

Design and Fabrication of Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator
Ryosuke Kobayashi; Takumi Kato; Kazuhiro Azuma; Yasushi Yamao
IEICE TRANSACTIONS ON ELECTRONICS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E98C, 7, 636-643, Jul. 2015, Peer-reviwed, Current mobile communication terminals are equipped with multiple RF circuits that cover all frequency bands assigned for the communication. In order to make efficient use of frequency spectrum and to reduce circuits in a terminal, a low-loss reconfigurable RF filter is necessary to flexibly change RF frequencies. In this paper, a new reconfigurable bandpass filter (BPF) having eight-frequency (three-bit) selection capability is proposed. It employs branch-line switched type variable resonators that provide low insertion loss. One of the design issues is how to control pass bandwidths among selectable frequencies. In order to analyze the bandwidth variation of the reconfigurable BPF, we calculate the changes of external Q and coupling coefficients. It is shown that the inductive coupling design can achieve less variation of bandwidth for the reconfigurable BPF, compared with commonly used capacitive coupling design. A prototype BPF on a printed circuit board with high dielectric constant substrate has been fabricated and evaluated in 2 GHz bands. It presents performance very close to the design results with respect to insertion loss, center frequency and passband bandwidth. Low insertion loss of less than 1 dB is achieved among the eight frequencies.
Scientific journal, English

A Simple Digital Predistortion Architecture for Beamforming Transmitter
Yasushi Yamao; Toshiki Hamanaka; Yuelin Ma; Koki Tanji; Eiichiro Otobe
Proc. of PIERS 2015, The Electromagnetics Academy, -, Jul. 2015, Peer-reviwed
International conference proceedings, English

Parameter Estimation Technique for the SNCK Scheme Based on the Spectral-Correlation Density
Zhiguo Sun; Danyang Tian; Xiaoyan Ning; Yamao Yasushi
WIRELESS PERSONAL COMMUNICATIONS, SPRINGER, 82, 3, 1505-1529, Jun. 2015, Peer-reviwed, The Sine Non-linear Chirp Keying (SNCK) is one kind of the SFM schemes, which play an important role as the commonly useful signals in sonar, radar and wireless communication systems. By adjusting its time-bandwidth product, the SNCK can satisfy different requirements of the quality of service and has better ability in Doppler shift inhibition than the ordinary MSK. However, no mathematical analysis for the time-bandwidth product (modulation factor) estimation of the SNCK scheme has been available. In this paper, a SCD-based estimation algorithm for the modulation factor of the SNCK scheme has been proposed. The mathematical model and diagrams of the three-dimensional SCD and the corresponding bi-frequency plane make it easy to understand how the SCD-based algorithm localizes the center frequency and the keying rate, as well as estimates the modulation factor. The simulation results show that the proposed estimation algorithm is useful under different SNR conditions. The corresponding Cramer-Rao lower bound are derived and used as the reference of the estimation algorithm. Moreover, we improve the estimation algorithm when the modulation factor varies, by using a set of the local ratio data, which compensates the differences between the simulation ratio values and the theoretical ratio results. This algorithm can be effective for the communication system with the SNCK scheme to synchronize the carrier and the symbol, as well as to demodulate the transmitted signals with unknown parameters. It is concluded that the obvious features of the SCD can be extracted for other similar signals with high reliability.
Scientific journal, English

Traffic Aware Power Allocation and Frequency Reuse for Green LTE-A Heterogeneous Networks
Yuhan Zheng; Songlin Sun; Bo Rongz; Michel Kadoch; Yasushi Yamao
Proc. of ICC 2015, IEEE, pp.3167--3172, Jun. 2015, Peer-reviwed
International conference proceedings, English

Packet Combining Relay Scheme with Sectorized Relay Station for Reliable ITS V2V Communication
Le Tien Trien; Yasushi Yamao
Proc. of VTC2015-Spring, IEEE, 6P, a-1, May 2015, Peer-reviwed
International conference proceedings, English

Experimental Results of Digital Predistorter for Very Wideband Mobile Communication System
Yuelin Ma; Yasushi Yamao
Proc. of VTC2015-Spring, IEEE, 6P, b-2, May 2015, Peer-reviwed
International conference proceedings, English

Cross-Layer Cooperation of Dynamic Multi-Hop Shortcut Local Path Control Scheme with Threshold Controlled Routing Protocol
Jin Watanabe; Yuki Matsuzawa; Yasushi Yamao
Proc. of CCNC2015, IEEE, pp. 469-474, Jan. 2015, Peer-reviwed
International conference proceedings, English

Improving Performance of Packet Combining Relay for ITS V2V Communication
Le Tien Trien; Yasushi Yamao
Proc. of VTC2014-Fall, IEEE, 8D-2, Sep. 2014, Peer-reviwed
International conference proceedings, English

An Investigation of Network Coding Relay in ITS V2V Communication at Intersections
Le Tien Trien; Yasushi Yamao
Proc. of IC-NIDC 2014, IEEE, p. 297-301, Sep. 2014, Peer-reviwed
International conference proceedings, English

A Method for Inverting Monotonous Continuous Nonlinear Functions
Yuelin Ma; Yasushi Yamao
Proc. of TriSAI 2014, BUPT, 060-193, Sep. 2014, Peer-reviwed
International conference proceedings, English

Highly Efficient Multi-Hop Transmission Using Intra-Flow Interference Cancellation and MRC
Jinze Dai; Yasushi Yamao
Proc. of ICC 2014, IEEE, pp.5531-5536, Jun. 2014, Peer-reviwed
International conference proceedings, English

In-house coaxial cable transmission system coexistent with ISDB-T signals in the UHF band -System design and DC offset removal in direct conversion receivers-
Takuya KURAKAKE; Takeshi KUSAKABE; Kimiyuki OYAMADA; Yasushi YAMAO
映像情報メディア学会誌, 映像情報メディア学会, Vol. 68, no. 5, 192-201, May 2014, Peer-reviwed
Scientific journal, Japanese

EPWM-OFDM Signal Transmission against Nonlinearities of E/O Converters in Radio over Fiber Channel
Xiaoxue Yu; Yasushi Yamao; Motoharu Matsuura
IEICE Trans. Commun., Vol. E97-B, No. 2, pp. 484-494, Feb. 2014, Peer-reviwed
Scientific journal, English

Wideband Digital Predistortion Using Spectral Extrapolation of Band-Limited Feedback Signal
Yuelin Ma; Yasushi Yamao; Yoshihiko Akaiwa; Koji Ishibashi
IEEE Trans. Circuit and Systems I, Vol. CAS-I, Vol.61 -7, pp. 2088-2097, 16 Jan. 2014, Peer-reviwed
Scientific journal, English

Multi-Hop Transmission Performance of Integrated Dynamic Multi-Hopping for Wireless Ad Hoc Networks
Yuki Matsuzawa; Yasushi Yamao; Kenta Otake; Koji Ishibashi
Proc. of CCNC2014, IEEE, pp. 1104-1109, Jan. 2014, Peer-reviwed
International conference proceedings, English

Adaptive Compensation of Inter-Band Modulation Distortion for Tunable Concurrent Dual-band Receivers
Yuelin Ma; Yasushi Yamao; Koji Ishibashi; Yoshihiko Akaiwa
IEEE Trans. Microwave Theory Tech., Vol. 61, No. 12, pp. 4209-4219, Dec. 2013, Peer-reviwed
Scientific journal, English

FPGA Implementation of Adaptive Digital Predistorter with Fast Convergence Rate and Low Complexity for Multi-Channel Transmitters
Yuelin Ma; Yasushi Yamao; Yoshihiko Akaiwa
IEEE Trans. Microwave Theory Tech., Vol. 61, No. 11, pp. 3961-3973, Nov. 2013, Peer-reviwed
Scientific journal, English

Blind Nonlinear Compensation Technique for RF Receiver Front-End
Yuelin Ma; Yasushi Yamao
Proc. of European Microwave Conference 2013, pp.1527-1530, Oct. 2013, Peer-reviwed
International conference proceedings, English

Superimposed adaptive network Coded Cooperation for Wireless Sensor Networks
Naoki Takeishi; Koji Ishibashi; Yasushi Yamao
Proc. of PIMRC2013, PHY39.2, 1185-1189, Sep. 2013, Peer-reviwed
International conference proceedings, English

Reliable Inter-Vehicle Broadcast Communication with Sectorized Roadside Relay Station
Huiting Cheng; Yasushi Yamao
Proc. of VTC2013-Spring, IEEE, 6I-5, Jun. 2013, Peer-reviwed
International conference proceedings, English

Performance of CSMA/CA Multi-Hop Network Considering Intra-Flow Interference under Fading Environment
Jinze Dai; Yasushi Yamao
Proc. of VTC2013-Spring, IEEE, 4H-4, Jun. 2013, Peer-reviwed
International conference proceedings, English

Efficient Packet Relay Scheme with Payload Combining for ITS V2V Communications
Le Tien Trien; Hideki Sugawara; Huiting Cheng; Yasushi Yamao; Yasuhiro Hirayama; Manabu Sawada
Proc. of WiVEC2013, IEEE, 14W-7, Jun. 2013, Peer-reviwed
International conference proceedings, English

Analysis of RoF-Echo Effect on OFDM Signal Transmission with EPWM Format
Xiaoxue Yu; Motoharu Matsuura; Yasushi Yamao
Proc. of WPMC2013, PLCC-M3-3, Jun. 2013, Peer-reviwed
International conference proceedings, English

An Algorithm for Obtaining the Inverse for a Given Polynomial in Baseband
Yuelin Ma; Yasushi Yamao; Yoshihiko Akaiwa
IEICE Trans. Fundamentals, Vol. E96-A, No. 3, pp. 675-683, Mar. 2013, Peer-reviwed
Scientific journal, English

Performance analysis of ITS V2V broadcast communication using CSMA/CA and a roadside relay station at intersections
Huiting Cheng; Yasushi Yamao
Journal of Information Processing, 21, 1, 90-98, 2013, Peer-reviwed, The reliability of Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) vehicle-to-vehicle (V2V) communication in real road environments suffers from fading, shadowing and the hidden terminal problem, especially for non-line-of sight (NLOS) areas such as intersections. In order to improve the communication reliability, a CSMA/CA based vehicle-roadside-vehicle broadcast relay network was proposed and its effectiveness has been shown through simulations. However, the potential of such a network has not been well analyzed and optimized. In this paper, a theoretical model is proposed to analyze the performance of the broadcast relay network in detail. In order to fit real vehicular environments, the model assumes a typical crossroad and takes into account fading, shadowing, the hidden terminal problem and the capture effect. The influence of system parameters including position of nodes, carrier sense threshold and RF frequency band on the reliability of the network is studied based on the model. The accuracy of the proposed analytical model is confirmed by simulations. The analytical model and the obtained results are useful for the design of vehicular broadcast networks to select appropriate system parameters. © 2013 Information Processing Society of Japan.
Scientific journal, English

Overlay cognitive radio OFDM system for 4G cellular networks
Songlin Sun; Yanhong Ju; Yasushi Yamao
IEEE Wireless Communications, 20, 2, 68-73, 2013, Peer-reviwed, In this study, we integrate overlay cognitive radio technology into 4G cellular networks for the sharing of TV spectrum. On one hand, OFDM is a promising technique for high-speed data transmission over multipath fading channels and has been considered to be the best candidate for 4G mobile networks. On another hand, the overlay cognitive radio model makes it possible to have two concurrent transmissions in a given interference region, where conventionally only one communication takes place at a given time. We investigate different service provision scenarios and propose both time domain and frequency domain overlay cognitive radio OFDM systems for next generation cellular networks. Numerical results show our proposed schemes can achieve satisfying performance in different use cases. © 2002-2012 IEEE.
Scientific journal, English

Three-Bit Reconfigurable Bandpass Filter Using Branch-Line Type Variable Resonator
Kazuhiro Azuma; Ryosuke Kobayashi; Yasushi Yamao
Proc. of APMC2012, 3C6-02, Dec. 2012, Peer-reviwed
International conference proceedings, English

Reduction of V2V Packet Collision Due to Traffic Concentration in Integrated V2V/I2V ITS Broadcast Communication System
Hideki Sugawara; Huiting Cheng; Yasushi Yamao
Proc. of ITS World Congress 2012, AP-00066, Oct. 2012, Peer-reviwed
International conference proceedings, English

Bandwidth Control of Reconfigurable Bandpass Filter by Automatic Coupling Adjustment Techniques
Takayuki Arai; Yasushi Yamao
Proc. of European Microwave Conference 2012, pp.1273-1276, Oct. 2012, Peer-reviwed
International conference proceedings, English

CSMA/CA Unicast Communication Performance under Fading Environment with Two-Dimensional Distribution of Hidden Terminal
Jingze Dai; Yasushi Yamao
IEICE Trans. Commun., Vol. E95-B, No. 9, 2708-2717, Sep. 2012, Peer-reviwed
Scientific journal, English

Robust and Easily Deployed Information Sharing System Architecture for Disaster Area
Yasushi Yamao; Takeo Fujii; Kiyohiko Hattori; Nobuo Nakajima
Proc. of TriSAI 2012, R-2-5, Sep. 2012, Peer-reviwed
International conference proceedings, English

Packet Delivery Rate of CSMA/CA Inter-Vehicle Broadcast Communications around Intersections
Takahiko Matsunaka; Huiting Cheng; Yasushi Yamao
Proc. of TriSAI 2012, R-4-2, Sep. 2012, Peer-reviwed
International conference proceedings, English

Wide Area and Reliable Sensor Network System using ZigBee Protocol Stack
Sho Kobayashi; Takaaki Suzuki; Nobuo Nakajima; Yasushi Yamao
Proc. of TriSAI 2012, S-7-4, Sep. 2012, Peer-reviwed
International conference proceedings, English

Nonlinearity Effect of DFB Laser Diode RoF Channel on EPWM-OFDM Signal Transmission
Xiaoxue Yu; Motoharu Matsuura; Yasushi Yamao
Proc. of TriSAI 2012, S-8-2, Sep. 2012, Peer-reviwed
International conference proceedings, English

Comparison of Analytical and Simulated Packet Delivery Rates for V2V Broadcast Communication
Hideki Sugawara; Yasushi Yamao
Proc. of TriSAI 2012, S-7-2, Sep. 2012, Peer-reviwed
International conference proceedings, English

PBL Cource - Design and Implementation of High Performance Digital Echo Canceller
Rui Jiang; Koji Iwaki; Kenzo Takahashi; Yasushi Yamao; Lin Zan
Proc. of TriSAI 2012, S-8-5, Sep. 2012, Peer-reviwed
International conference proceedings, English

Performance Analysis of CSMA/CA Broadcast Relay Network for ITS V2V communications
Huiting Cheng; Yasushi Yamao
Proc. of VTC2012-Spring, 2D-2, May 2012, Peer-reviwed
International conference proceedings, English

OFDM Signal Transmission by EPWM Transmitter in Nonlinear RoF Channel
Xiaoxue Yu; Motoharu Matsuura; Shinsuke Yokozawa; Yasushi Yamao
Proc. of VTC2012-Spring, 10G-2, May 2012, Peer-reviwed
International conference proceedings, English

Fast Baseband Polynomial Inverse Algorithm for Nonlinear System Compensation
Yuelin Ma; Yoshihiko Akaiwa; Yasushi Yamao
Proc. of VTC2012-Spring, 2F-1, May 2012, Peer-reviwed
International conference proceedings, English

Test Bed for Characterization and Predistortion of Power Amplifiers
Yuelin Ma; Yoshihiko Akaiwa; Yasushi Yamao; Sonbai He
International Journal of RF and Microwave Computer-Aided Engineering, Vol. 23, Issue 1, pp74-82, May 2012, Peer-reviwed
Scientific journal, English

An Open-loop Digital Predistorter based on Memory Polynomial Inverses for Linearization of RF Power Amplifier
Yuelin Ma; Sonbai He; Yoshihiko Akaiwa; Yasushi Yamao
International Journal of RF and Microwave Computer-Aided Engineering, Vol. 21, Issue 5, pp.589-595, Sep. 2011, Peer-reviwed
Scientific journal, English

CSMA/CA Performance under Fading Environment with Two-Dimensional Distribution of Hidden Terminal
Jinze Dai; Yasushi Yamao
Proc. of VTC2011-Fall, 3P-12, Sep. 2011, Peer-reviwed
International conference proceedings, English

Theoretical Analysis of Broadcast Packet Delivery Rate in ITS V2V Communication with CSMA/CA
Kazuya Minato; Jinze Dai; Yasushi Yamao
Proc. of WiVEC2011, P-11, Sep. 2011, Peer-reviwed
International conference proceedings, English

Performance of Broadcast Transmission from Multiple Vehicles in Vehicle-Roadside-Vehicle Relay Network
Kazuya Minato; Huiting Cheng; Yasushi Yamao
Proc. of CHINACOM 2011, -, Aug. 2011
International conference proceedings, English

Amplitude Noise Compensating EPWM Transmitter with Predistorter
Shinsuke Yokozawa; Yasushi Yamao
Proc. of TriSAI 2011, -, Aug. 2011
International conference proceedings, English

Fixed-Point Arithmetic Operation Design of Delta-Sigma Modulators for EPWM Transmitter
Koji Iwaki; Shinsuke Yokozawa; Yasushi Yamao
Proc. of TriSAI 2011, -, Aug. 2011
International conference proceedings, English

High-Throughput Time Group Access MCR-SS-CSMA/CA for Wireless Ad Hoc Networks with Layered-Tree Topology
Naoto Kobatake; Yasushi Yamao
Telecommunication Systems Journal, DOI 10.1007/, s11235-011-9596-z, Aug. 2011, Peer-reviwed
Scientific journal, English

Suppression of Quantization Noise for EPWM Transmitter with 2nd-order Delta-Sigma Modulator
Shinsuke Yokozawa; Yasushi Yamao
Proc. of VTC2011-Spring, 5B-5, May 2011, Peer-reviwed
International conference proceedings, English

Adaptive Semi-Blind Space-Time Equalization for Frequency Selective Rayleigh Fading MIMO Systems
Huiting Cheng; Sheng Chen; Yasushi Yamao
Proc. of VTC2011-Spring, 6H-2, May 2011, Peer-reviwed
International conference proceedings, English

Two-Stage Reconfigurable Bandpass Filter Using Two-Bit Variable-Length Transmission Line Resonator
Hiroki Mori; Jun-ichi Ohtsuka; Ryota Fukuda; Yasushi Yamao
Proc. of APMC2010, THG-21, Dec. 2010, Peer-reviwed
International conference proceedings, English

Cognitive Temporary Bypassing for Reliable Multi-Hop Transmission in Wireless Ad Hoc Networks
Kenichi Nagao; Yasushi Yamao
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E93B, 12, 3391-3399, Dec. 2010, Peer-reviwed, Multi hop wireless ad hoc networks suffer from temporary link error due to fading In order to improve packet transmission reliability and achieve efficient transmission in fading environment a new cognitive temporary bypassing scheme is proposed based on a cross layer approach and cognitive behavior of local nodes The proposed scheme enables neigh boring nodes to prepare and create a temporary bypass for lost packets This is done by monitoring message packets that include information of the multi hop route and link acknowledgement The scheme also includes an anti collision function that is necessary to prevent contention among multi pie bypassing nodes Packet success probability with the proposed scheme is studied both by theoretical analysis and time domain computer simulation for Rayleigh faded single and multi hop links Network simulation using a modified QualNet simulator validate that packet success probability is remarkably improved with the scheme for maximum Doppler frequencies up to 30 Hz
Scientific journal, English

Quantization Noise and Distortion Analysis of Envelope Pulse-Width Modulation (EPWM) Transmitters for OFDM Signal Amplification
Edwin M. Umali; Koji kawzoe; Yasushi Yamao
IEICE Trans. Fundamentals, Vol. E93-A, No. 10, 1724-1734, Oct. 2010, Peer-reviwed
Scientific journal, English

High-Throughput Time Group Access SS-CSMA/CA for Wireless Ad Hoc Networks with Layered-Tree Topology
Naoto Kobatake; Yasushi Yamao
Proc. of WMNC 2010, Radio resource management-3, Oct. 2010
International conference proceedings, English

Two-Bit Variable Frequency Resonator and Bandpass Filter Using Three-Layered Offset Strip Line Structure
Hiroki Mori; Mitsuhiro Fushimi; Yasushi Yamao
Proc. of TriSAI 2010, SS7-5, Oct. 2010
International conference proceedings, English

Performance of Broadcast Transmission from Multiple Vehicles in Vehicle-Roadside-Vehicle Relay Network
Kazuya Minato; Yasushi Yamao
Proc. of TriSAI 2010, SS2-2, Oct. 2010
International conference proceedings, English

Throughput and Delay Performance of Multi-Code SS-CSMA/CA Wireless Packet Transmission with Group Acknowledgement Method
Masaki Takamori; Yasushi Yamao
Proc. of TriSAI 2010, SS7-1, Oct. 2010
International conference proceedings, English

Suppression of Quantization Noise for EPWM Transmitter by Controlling Phase Modulator Output Amplitude
Shinsuke Yokozawa; Edwin M. Umali; Yasushi Yamao
Proc. of TriSAI 2010, SS1-5, Oct. 2010
International conference proceedings, English

Quantization Noise Suppression for Envelope Pulse-Width Modulation (EPWM) Transmitters
Edwin M. Umali; Shinsuke Yokozawa; Yasushi Yamao
Proc. of VTC2010-Fall, TS07-02, Sep. 2010, Peer-reviwed
International conference proceedings, English

Cross-Layer Multi-Hopping Scheme for Efficient and Reliable Transmission in Fading Environment
Yasushi Yamao; Yutaro Kida; Yusuke Kadowaki
Proc. of VTC2010-Fall, TS01-04, Sep. 2010, Peer-reviwed
International conference proceedings, English

Suppression of Quantization Noise from EPWM Transmitter Generated near Signal Spectrum
Shinsuke Yokozawa; Yasushi Yamao
Proc. of AP-RASC'10, CBDFK-5, Sep. 2010, Peer-reviwed
International conference proceedings, English

A Novel Feedback Configured Predistorter for Power Amplifiers
Yuelin Ma; Yoshihiko Akaiwa; Yasushi Yamao
Proc. of APWCS2010, S12-1, May 2010, Peer-reviwed
International conference proceedings, English

Performance of Downlink DSTBC-WCDMA in Fast-Varying Time-Dispersive Channels
Edwin M. Umali; Joel Joseph S. Marciano; Yasushi Yamao
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E92B, 12, 3815-3826, Dec. 2009, Peer-reviwed, This paper presents the performance of DSTBC when applied on the downlink transmission of WCDMA cellular systems in fast-varying tune-dispersive channels. First, three-DSTBC-WCDMA receiver architectures are proposed and they are: (1) the DSTBC Rake receiver for combined-code (D-Rake-C), (2) the DSTBC deterministic receiver for combined-code (D-Det-C), and (3) the DSTBC deterministic de-prefix receiver for combined-code (D-Det-DP-C). Detection can be divided into a correlator that combines descrambling and despreading, and a DSTBC decoder. The correlator is designed to perform signal separation of the multipath-multiuser signal via least-square (LS) estimation. To enable the correlator to perform signal separation at every block period, the long combined spreading and scrambling codes are divided into shorter codes. Then, the proposed receivers are theoretically analyzed in time-dispersive channels and multiple-user environment using the moment generating function (MGF) of fading distributions. For analyzing interference tolerance, the standard Gaussian approximation is employed. Finally, simulations are performed. Theoretical performance well matches simulated results. Among the three receivers, the D-Det-DP-C receiver has the best performance in time-dispersive channels with a maximum excess delay of 4 chips and a maximum Doppler frequency of 250 Hz. Results also show minimal performance degradation for fast fading channels with a maximum Doppler frequency of 1200 Hz. The best performance is obtained when the receiver has the information on the maximum excess delay and all users' spreading codes.
Scientific journal, English

Analysis of Hidden Terminal Effect on a CSMA/CA Network under Fading Environment
Jinze Dai; Yasushi Yamao
Proc. of WCSP2009, Oral 15-2, Nov. 2009, Peer-reviwed
International conference proceedings, English

DSTBC Performance on Downlink WCDMA in Fast-Varying Time-Dispersive Channels
Edwin M. Umali; Yasushi Yamao
Proc. of TriSAI 2009, R4-2, Oct. 2009
International conference proceedings, English

Two-Stage Bandpass Filter Using Two-Bit Reconfigurable Resonator
Hiroki Mori; Jun-ichi Ohtsuka; Yasushi Yamao
Proc. of TriSAI 2009, S5-2, Oct. 2009
International conference proceedings, English

Time Group Access SS-CSMA/CA for High-Throughput Layered-Tree Wireless Ad Hoc Network
Naoto Kobatake; Yasushi Yamao
Proc. of TriSAI 2009, S7-3, Oct. 2009
International conference proceedings, English

Noise Characteristics of OFDM Signal Generated by EPWM Transmitter with Clipping and Filtering
Koji Kawazoe; Edwin M. Umali; Yasushi Yamao
Proc. of TriSAI 2009, S8-1, Oct. 2009
International conference proceedings, English

Vehicle-Roadside-Vehicle Relay Communication Network employing Multiple Frequencies and Routing Function
Yasushi Yamao; Kazuya Minato
Proc. of ISWCS2009, pp.413-417, Sep. 2009, Peer-reviwed
International conference proceedings, English

Multi-Code SS-CSMA/CA for Cluster-Tree Wireless Ad Hoc Networks
Naoto Kobatake; Satoru Takagishi; Yasushi Yamao
Proc. of ISWCS2009, pp.652-656, Sep. 2009, Peer-reviwed
International conference proceedings, English

Multi-Bit Reconfigurable Resonator Using Tapped Transmission Line and RF Switches
Yasushi. Yamao; Jun-ichi Ohtsuka; Hiroki Mori; Ryota Fukuda
Proc. of European Microwave Conference 2009, pp.1223-1226, Sep. 2009, Peer-reviwed
International conference proceedings, English

Effects of Quantization Noise and Distortion in EPWM Transmitters for OFDM Signal Amplification
Edwin M. Umali; Koji Kawazoe; Yoshikazu Toyama; Yasushi Yamao
Proc. of VTC2009-Spring, 7P-6, Apr. 2009, Peer-reviwed
International conference proceedings, English

Multi-Hop Transmission Performance of Cognitive Temporary Bypassing for Wireless Ad Hoc Networks
Kenichi Nagao; Yusuke Kadowaki; Yasushi Yamao
Proc. of CCNC2009, S1-2-3, Jan. 2009, Peer-reviwed
International conference proceedings, English

Performance of Cognitive Temporary Bypassing for Reliable Transmission in Wireless Ad Hoc Networks
Kenichi Nagao; Yasushi Yamao
Proc. of TriSAI 2008, pp.111-114, Oct. 2008
International conference proceedings, English

Dynamic Multi-hopping for Efficient and Reliable Transmission in Wireless Ad Hoc Networks
Yasushi Yamao; Yusuke Kadowaki; Kenichi Nagao
Proc. of APCC2008, 16-PM-D-2-4, Oct. 2008, Peer-reviwed
International conference proceedings, English

Generation of OFDM Signal with Envelope Pulse-Width Modulation (EPWM) Transmitter employing 2nd-order Delta-Sigma Modulator
Koji Kawazoe; Yoshikazu Toyama; Edwin M. Umali; Yasushi Yamao
Proc. of APWCS2008, T14-5, Aug. 2008, Peer-reviwed
International conference proceedings, English

Power Efficiency Analysis for OFDM Signal Amplification with Doherty and Extended Doherty Transmitters
Y. Yamao; Y. Toyama; E. M. Umali
Proc. of European Wireless Conference 2008, C7-3, Jun. 2008, Peer-reviwed
International conference proceedings, English

Power Spectrum Analysis of Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Amplification of OFDM Signals
E. M. Umali; Y. Toyama; Y. Yamao
Proc. of VTC2008-Spring, pp. 1261-1265, May 2008, Peer-reviwed
International conference proceedings, English

Time Shift Grouping Access in IEEE 802.15.4 MAC Beacon Mode for Layered-Tree Networks
Yasushi Yamao; Satoru Takagishi
Proc. of CCNC2008, FA1-S1, Jan. 2008, Peer-reviwed
International conference proceedings, English

Downlink DSTBC-WCDMA in a Fast Time-Dispersive Channel
Edwin M. Umali; Yasushi Yamao
Proc. of ISWCS2007, pp. 503-507, Nov. 2007, Peer-reviwed
International conference proceedings, English

Cognitive Temporary Bypassing for Reliable Transmission in Wireless Ad Hoc Networks
Yasushi Yamao; Kenichi Nagao; Takeo Fujii
Proc. of ISWCS2007, pp. 346-349, Nov. 2007, Peer-reviwed
International conference proceedings, English

Power Efficiency Analysis for OFDM Signal Amplification with Doherty, Extended Doherty and EPWM Transmitters
Yasushi Yamao; Yoshikazu Toyama; Edwin M. Umali
Proc. of AICT 2007, ****, Sep. 2007
International conference proceedings, English

Multi-band routing for ad-hoc cognitive radio networks
Takeo Fujii; Yasushi Yamao
Proc. of SDR Forum 2006, ****, Nov. 2006, Peer-reviwed
International conference proceedings, English

A New Adjustment Method for the Frequency-Dependent IMD Compensator of the Digital Predistortion Linearizer
S. Mizuta; Y. Suzuki; S. Narahashi; Y. Yamao
Proc. of RWS2006, WE3A-2, Jan. 2006
International conference proceedings, English

A 900/1500/2000-MHz Triple-Band Reconfigurable Power Amplifier Employing RF-MEMS Switches
A. Fukuda; H. Okazaki; S. Narahashi; T. Hirota; Y. Yamao
Proc. of IMS2005, WE2E-4, 2005
International conference proceedings, English

Novel Band-Reconfigurable High Efficiency Power Amplifier Employing RF-MEMS Switches
A. Fukuda; H. Okazaki; T. Hirota; Y. Yamao
IEICE Trans. Fundamentals, E88-C, 11, 2141-2149, 2005, Peer-reviwed
Scientific journal, English

Novel 900 MHz/1.9 GHz dual-mode power amplifier employing MEMS switches for optimum matching
A Fukuda; H Okazaki; T Hirota; Y Yamao
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 14, 3, 121-123, Mar. 2004, A novel scheme is proposed for a compact band-switchable power amplifier that employs Micro-Electro-Mechanical System (MEMS) switches in a matching network (MN). According to the-on/off status, the switches change the frequency response of the MN, and then the optimum matching can be achieved in different frequency bands. Following the proposed scheme, a dual-band GaAs FET amplifier is designed for the 0.9-GHz and 1.9-GHz bands. The experimental results exhibit the small signal gain of greater than 16 dB and the saturated output power of 31 dBm in each frequency band with adequate efficiency. The performance levels are very close to those of single-mode power amplifiers employing the same FET.
Scientific journal, English

Digital predistortion linearizer for compensating frequency-dependent IM distortion
S Mizuta; Y Suzuki; T Hirota; Y Yamao
34TH EUROPEAN MICROWAVE CONFERENCE, VOLS 1-3, CONFERENCE PROCEEDINGS, HORIZON HOUSE PUBLICATIONS LTD, 1053-1056, 2004, This paper proposes a new digital predistortion linearizer based on power series representation that strongly suppresses intermodulation distortion (IMD). The proposed predistortion linearizer is equipped with distortion generation paths that consist of odd-order distortion generators, vector regulators and frequency characteristics compensators. The proposed linearizer compensates the frequency characteristics of IMD, which limit the performance of current predistortion linearizers.
In an experiment, the 3rd- and 5th-order IMD components are successfully suppressed by the proposed predistortion linearizer when a three-tone signal is input. The 3rd- and 5th-order IMD components are less than -60 dB at the output back-off of 3 dB from the 1 dB gain compression point as measured with a single-tone.
International conference proceedings, English

Linearized Doherty Amplifier using a New Digital Predistorter Compensating Frequency-Dependent Intermodulation Distortion for Mobile Radio
Y. Suzuki; S. Mizuta; T. Hirota; Y. Yamao
Proc. of APCC2004, Vol. 2, 558-562, 2004
International conference proceedings, English

Wireless QoS-Aware Resource Management for CDMA Packet Multimedia Cellular Radio
L. Chen; H. Kayama; N. Umeda; Y. Yamao
IEICE Trans. Fundamentals, E86-A, 7, 1576-1584, 2003
Scientific journal, English

Transmit Power and Window Control to Reduce Inter-User Interference in CDMA Cellular Packet Systems
H. Kawai; S. Ohkubo; T. Otsu; H. Suda; Y. Yamao
IEICE Trans. Fundamentals, E86-A, 7, 1698-1706, 2003
Scientific journal, English

Multi-hop wireless link system for new generation mobile radio access networks
T Otsu; Y Aburakawa; Y Yamao
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E85B, 8, 1542-1551, Aug. 2002, This paper proposes a multi-hop wireless link system for radio access networks (RANs) of new generation mobile communication systems. The performance of the multi-hop wireless link system is evaluated from the viewpoints of total output power, co-frequency interference characteristics, and the system frequency bandwidth based on a comparison with that of the single-hop wireless link system, which is currently used as a RAN. The proposed system is effective in realizing an enormous approach link capacity from both the total output power and the co-frequency interference viewpoints. From the system frequency bandwidth viewpoint, the optimum number of relays in the multi-hop connection is determined to be three hops in a line-of-sight propagation environment in order to minimize the frequency bandwidth for transferring traffic. We conclude that the multi-hop wireless link system is suitable for new generation mobile communication systems.
Scientific journal, English

Multi-Hop Radio Access Cellular Concept for Fourth-Generation Mobile Communications System
Y. Yamao; T. Otsu; A. Fujiwara; H. Murata; S. Yoshida
Proc. of IEEE PIMRC2002, Vol. 1, 59-63, 2002
International conference proceedings, English

Vision and Technologies for Future Mobile Communication System with a New 4G Broadband Packet Wireless Access using VSF-OFCDM
M. Minomo; Y. Yamao
Proc. of IEEE ICT2002, ****, 2002
International conference proceedings, English

Capacity and Transmission Power Estimation of Two-hop CDMA Cellular System
K. Yamamoto; H. Murata; S. Yoshida; A. Fujiwara; T. Otsu; Y. Yamao
Proc. of WPMC2002, Vol. 1, 97-101, 2002
International conference proceedings, English

Fiber and Free-space Hybrid Optical Networking for New Generation Mobile Radio Access Network
Y. Aburakawa; T. Otsu; Y. Yamao
Proc. of European Microwave Conference 2004, Vol. 2, 586-590, 2002
International conference proceedings, English

ブロードバンドCDMAセルラ方式におけるマルチホップアクセス法のシステム容量増大効果
藤原淳; 竹田真二; 吉野仁; 大津徹; 山尾泰
IEICE Trans. Commun., J85-B, 12, 2073-2079, 2002
Scientific journal, Japanese

Network architecture for mobile communications systems beyond IMT-2000
T Otsu; Okajima, I; N Umeda; Y Yamao
IEEE PERSONAL COMMUNICATIONS, IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 8, 5, 31-37, Oct. 2001, This article describes suitable network architecture for the mobile communications system beyond IMT-2000. Recent rapid developments in mobile communication services have significantly altered the lifestyles of many people. With the, increasing demand for access to the Internet, the amount of data traffic in mobile communication networks has significantly increased and will dominate these networks. Therefore, mobile networks beyond IMT-2000 should offer higher bit rate channels and adapt to multimedia traffic more efficiently. This article first forecasts market trends in mobile communications in order to identify requirements of the mobile communications system beyond IMT-2000. Then the article considers the network architecture of the mobile communications system beyond IMT-2000 that will satisfy those requirements.
Scientific journal, English

Complexity reduction of turbo decoding
A Shibutani; H Suda; Y Yamao
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E84B, 9, 2705-2709, Sep. 2001, This paper addresses a complexity reduction scheme for turbo decoding and demonstrates its impact on bit error rate performance in a wideband direct sequence code division multiple access (W-CDMA) mobile radio environment. The complexity reduction scheme combines concatenation of CRC with turbo coding and incorporates a CRC error-detection flag for terminating schemes of decoding iteration. The impact of the scheme on complexity reduction of turbo decoding is investigated using several coding parameters such as the maximum number of decoding iterations and interleaver length of the turbo codes. Miss-detection probability of CRC error-detection is also investigated in this paper.
Scientific journal, English

The future generations of mobile communications based on broadband access methods
S Ohmori; Y Yamao; N Nakajima
WIRELESS PERSONAL COMMUNICATIONS, KLUWER ACADEMIC PUBL, 17, 2-3, 175-190, Jun. 2001, The forthcoming mobile communication systems are expected to provide much variety of services from high quality voice to high definition videos through high data rate wireless channels at anywhere in the world. High data rate requires broad frequency bands. and sufficient broadband can be achieved in higher frequency bands such as microwave. Ka-band and millimeter-wave. Broadband wireless channels have to be connected to broadband fixed networks such as the Internet and local area networks. The future generation systems will include not only cellular phones, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LAN. intelligent transport systems (ITS) and high altitude stratospheric platform station (HAPS) systems. The key words in the future generations of mobile communications are "multimedia communications" "wireless access to broadband fixed networks" and "seamless roaming among different systems' This article discusses the future generations mobile communication systems.
Scientific journal, English

System Architecture for Mobile Communications Systems Beyond IMT-2000
N. Umeda; T. Otsu; Y. Yamao
Proc. of 3rd Generation Infra-Structure and Systems Conference, 347-351, 2001
International conference proceedings, English

Virtual Base Station Configuration Scheme for IP-Based Cellular Systems
T. Ikeda; I. Okajima; N. Umeda; Y. Yamao
Proc. of WPMC2001, 1591-1595, 2001
International conference proceedings, English

Link Bandwidth Assignment Schemes for Wireless Multi-hop Network
H. Tobe; Y. Aburakawa; T. Otsu; Y. Yamao
Proc. of APCC2001, 125-128, 2001
International conference proceedings, English

Wireless QoS Architecture and Resource Management for CDMA Packet Access Multimedia Cellular Radio
L. Chen; H. Kayama; N. Umeda; Y. Yamao
Proc. of IEEE 54th VTC 2001 Fall, Vol. 1, 64-68, 2001
International conference proceedings, English

Architecture and mobile IP nu 6 extensions supporting mobile networks in mobile communications
Okajima, I; N Umeda; Y Yamao
IEEE 54TH VEHICULAR TECHNOLOGY CONFERENCE, VTC FALL 2001, VOLS 1-4, PROCEEDINGS, IEEE, 2533-2537, 2001, Mobile IPv6 supports packet routing for hosts moving on the Internet, but lacks support for networks moving on the Internet. For example, a network comprising a set of hosts and routers in a train can be a mobile network. While the mobile network is moving, a router in the network changes its point of connection to the Internet. This paper proposes an architecture and Mobile IPv6 extensions that support packet routing for mobile networks. The proposed scheme enables any host on a mobile network to communicate with any host connected to the Internet.
International conference proceedings, English

System Architecture for Mobile Communications Systems Beyond IMT-2000
T. Otsu; N. Umeda; Y. Yamao
Proc. of IEEE GLOBECOM2001, Vol. 1, 538-542, 2001
International conference proceedings, English

Radio Access Network Design Concept for the Fourth Generation Mobile Communication System
Y. Yamao; N. Umeda; H. Suda; N. Nakajima
Proc. of IEEE VTC2000-Spring, 2285-2289, 2000
International conference proceedings, English

Performance of W-CDMA Mobile Radio with Turbo Codes Using Prime Interleaver
A. Shibutani; H. Suda; Y. Yamao
Proc. of IEEE VTC2000-Spring, 946-950, 2000
International conference proceedings, English

Interference Reduction Method Utilizing Transmit Power and Window Control for Mobile Packet Communications
H. Kawai; S. Ohkubo; H. Suda; T. Otsu; Y. Yamao
Proc. of Asia-Pacific Commun. Conference 2000, 1107-1111, 2000
International conference proceedings, English

Wireless Resource Allocation with QoS Consideration for Packet Access Multimedia Cellular Radio
L. Chen; N. Umeda; Y. Yamao
Proc. of Asia-Pacific Commun. Conference 2000, 275-279, 2000
International conference proceedings, English

第4世代移動通信の展望－無線システムを中心とした課題について－
山尾泰; 梅田成視; 大津徹; 中嶋信生
信学論(B), J83-B, 10, 1364-1373, 2000
Scientific journal, Japanese

Effect of Time Diversity Against Simulcast Delay Interference in FLEX-TD 4FSK Paging System
S. Ohkubo; S. Ito; Y. Yamao
Proc. of Asia-Pacific Commun Conference 1997, 801-805, 1997
International conference proceedings, English

Time Diversity Improvements in FLEX-TD New Generation Paging System
S. Ito; S. Ohkubo; T. Sakai; Y. Yamao
Proc. of IEEE VTC 1996, 443-447, 1996
International conference proceedings, English

PREDICTIVE ANTENNA SELECTION DIVERSITY (PASD) FOR TDMA MOBILE RADIO
Y YAMAO; Y NAGAO
IEICE TRANSACTIONS ON COMMUNICATIONS, IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, E77B, 5, 641-646, May 1994, Peer-reviwed, Antenna selection diversity is an effective method to achieve both better transmission performance and compact circuit implementation in TDMA portable radio communications. However, diversity performance in fast fading environments is insufficient. This paper proposes a novel predictive antenna selection diversity scheme, PASD, which improves the diversity performance for higher fading rates. In PASD, received signal power for the assigned data slot is predicted from previously measured data. Thus, selection errors due to the receiving power changes caused by fast Rayleigh fading can be effectively avoided. An experimental result for a 3-ch TDMA system with a frame duration of 20 ms shows that the diversity gain was increased by 1.3 dB over the conventional method for a fading rate of 40 Hz. PASD is also shown to have improved diversity performance against cochannel interference.
Scientific journal, English

ディジタル移動通信用低消費電力直交変調IC
山尾泰; 斉藤茂樹
信学論(C), J76-C-I, 11, 453-461, 1993, Peer-reviwed
Scientific journal, Japanese

ツインカウンタ形ディジタルループプリセット周波数シンセサイザ
垂沢芳明; 山尾泰; 野島俊雄
信学論(C), J76-C-I, 11, 437-444, 1993
Scientific journal, Japanese

ディジタルループプリセット形高速周波数シンセサイザ
垂沢芳明; 山尾泰; 斉藤茂樹
信学論(BⅡ), J75-B-Ⅱ, 6, 345-353, 1992
Scientific journal, Japanese

π/4シフトQPSKの誤り率に及ぼす遅延スプレッドの影響
小山博; 伊倉雅治; 山尾泰; 小園茂
信学論(BⅡ), J75-B-Ⅱ, 4, 255-257, 1992
Scientific journal, Japanese

NEW DIGITAL MOBILE RADIO TECHNOLOGIES
SHIMIZU, I; S SAITO; K CHIBA; Y TARUSAWA; Y YAMAO
NTT REVIEW, NTT CORP, 4, 1, 64-69, Jan. 1992, In order to develop a digital mobile radio unit it is necessary to achieve highly precise and efficient pi/4 shifted QPSK transmission in a TDMA burst RF channel. This paper discusses the configuration of a digital mobile radio and explain the prerequisite conditions for its various sub-systems. Next, as new fundamental element in the mobile radio technologies, we propose an RF quadrature modulator, adaptive carrier tracking demodulator, linearized saturation amplifier with bi-directional feed control, as well as a digital loop preset synthesizer. Also, the configuration of each of the above and their superior features are demonstrated. In addition, the efficacy of these basic sub-system technologies in designing compact and low power consumption mobile radio units is shown.
Scientific journal, English

高速周波数切換用ディジタル・ループプリセット周波数シンセサイザ（DLPS)
垂沢芳明; 山尾泰; 斉藤茂樹
NTT R&D, 41, 6, 749-756, 1992
Scientific journal, Japanese

Predictive Antenna Selection Diversity (PASD) for TDMA Mobile Radio
Y. Yamao; Y. Nagao
Proc. of IEEE ICC'91, 1480-1484, 1991
International conference proceedings, English

Nyquist QPSK Transmission using Rational-Function Filter for Mobile Radios
T. Takami; S. Saito; S. Tomisato; Y. Yamao
Proc. of IEEE VTC1991, 663-668, 1991
International conference proceedings, English

Field Experiments on TDMA Mobile Radio Signal Transmissions
M. Ikura; K. Ohno; Y. Yamao; F. Adachi
Proc. of IEEE VTC1991, 669-674, 1991
International conference proceedings, English

QPSK移動無線通信における近似ナイキスト伝送の検討
鷹見忠雄; 斉藤茂樹; 冨里繁; 山尾泰
信学論(BⅡ), J74-B-Ⅱ, 7, 405-412, 1991
Scientific journal, Japanese

ディジタル移動通信用移動機技術
清水功; 垂沢芳明; 千葉耕司; 斉藤茂樹; 山尾泰
NTT R&D, 40, 10, 1319-1326, 1991
Scientific journal, Japanese

Low Power Quadrature Modulator IC's for Digital Mobile Radios
Y. Yamao; S. Saito
Proc. of 3rd Asia-Pacific Microwave Conference, 771-774, 1990
International conference proceedings, English

DIGITAL LOOP-PRESET FREQUENCY-SYNTHESIZER
Y TARUSAWA; Y YAMAO; S SAITO
20TH EUROPEAN MICROWAVE CONF 90, VOLS 1 AND 2, MICROWAVE EXHIBITIONS & PUBL LTD, 435-440, 1990
International conference proceedings, English

Performance of π/4-QPSK Transmission for Digital Mobile Radio Applications
Y. Yamao; S. Saito; H. Suzuki; T. Nojima
Proc. of IEEE G'COM'89, 443-473, 1989
International conference proceedings, English

分割パルスカウントＦＭ復調器（MPC-FM復調器）
佐和橋衛; 山尾泰; 室田和昭
信学論(B), J71-B, 7, 839-846, 1988
Scientific journal, Japanese

DSPを用いた直交形ディジタル・アナログ共用ＦＭ変調器の設計
山尾泰
信学論(B), J69-B, 5, 475-484, 1986
Scientific journal, Japanese

A Single-Chip MSK Coherent Demodulator for Mobile Radio Transmission
H. Suzuki; Y. Yamao; H. Kikuchi
IEEE Trans. VT, VT-34, 4, 157-168, 1986
Scientific journal, English

GaAs Broadband Monolithic Switches
Yasushi Yamao; Takayuki Sugeta
IEICE Trans. on Electronics, 電子通信学会, J68-C, 3, 163-170, 1985, Peer-reviwed
Scientific journal, Japanese

A Low-Noise GaAs Monolithic Broad-Band Amplifier Using a Drain Current Saving Technique
K. Osafune; N. Kato; T. Sugeta; Y. Yamao
IEEE Tran. MTT, MTT-33, 6, 543-545, 1985
Scientific journal, English

Digital Portable Transceiver Using GMSK Modem and ADM Codec
Hiroshi Suzuki; Koji Momma; Yasushi Yamao
IEEE Journal on Selected Areas in Communications, 2, 4, 604-610, 1984, Digital mobile radio transmission techniques and integrated circuit devices have been developed for application to a digital portable transceiver utilizing narrow-band GMSK modulation and ADM voice coding. Design and performance of a quadrature type GMSK modulator and a single-chip coherent demodulator as the GMSK modem are described. To overcome slow fading, encountered in portable applications, switching diversity using a jitter detection type sensor is proposed and shown to be effective. An experimental portable transceiver, developed to demonstrate hardware feasibility, is also described. Copyright © 1984 by The Institute of Electrical and Electronics Engineers. Inc.
Scientific journal, English

GaAs Monolithic Low-Power Amplifiers with RC Parallel Feedback
J. Tajima; Y. Yamao; T. Sugeta; M. Hirayama
IEEE Tran. MTT, MTT-32, 5, 542-544, 1984
Scientific journal, English

SINGLE-CHIP BASEBAND WAVEFORM GENERATOR CMOS-LSI FOR QUADRATURE-TYPE GMSK MODULATOR
H SUZUKI; Y YAMAO; K MOMMA
ELECTRONICS LETTERS, IEE-INST ELEC ENG, 20, 21, 875-876, 1984
Scientific journal, English

GMSK Digital Portable Transceiver Using 32 kbps ADM
H. Suzuki; K. Monma; Y. Yamao
IEEE VTC'83 Conference Record, 341-346, 1983
International conference proceedings, English

ディジタルIC化GMSK変復調器
鈴木博; 山尾泰
電気通信研究所研究実用化報告, 32, 6, 1313-1326, 1983
Scientific journal, Japanese

GaAs-FET ダブルバランスミキサを用いた直交形変調器の設計
山尾泰; 鈴木博
信学論(B), J65-B, 9, 1140-1147, 1982
Scientific journal, Japanese

ディジタル信号処理によるディジタルFM直交形変調器の設計
鈴木博; 山尾泰
信学論(B), J65-B, 9, 1148-1155, 1982
Scientific journal, Japanese

SINGLE-CHIP CMOS MSK COHERENT DEMODULATOR
H SUZUKI; Y YAMAO; H KIKUCHI
ELECTRONICS LETTERS, INST ENGINEERING TECHNOLOGY-IET, 18, 13, 581-582, 1982
Scientific journal, English

第４世代モバイル技術
山尾泰
2002, 映像情報メディア学会誌, 56, 5, 272-281, Japanese, Introduction other

移動通信の現状と将来
尾上誠藏; 山尾泰
2002, 日本ロボット学会誌, 20, 8, 9-12, Japanese, Introduction other

Development for 4th generation mobile communications
Nobuo Nakajima; Yasushi Yamao
The great success of the i-mode service shows that data communication services are becoming accepted in the mobile communication world. Multimedia mobile communication services will be provided by 3rd generation IMT-2000 systems next year in Japan. Thus, the time has come to begin the research and development for 4th generation (4G) mobile communication systems. There exist many difficult issues for 4G systems, such as frequency resources, additional investment, higher speed wireless transmission technology and so on. Furthermore, a new concept must be discussed for 4G before solving these issues. This paper briefly presents current conditions of cellular systems and the development of IMT-2000 in Japan. The concept and problems of the 4G system are then described along with new technologies that will be useful in solving technical problems. Copyright © 2001 John Wiley &
Sons, Ltd., Jan. 2001, Wireless Communications and Mobile Computing, 1, 1, 3-12, English, Book review, 1530-8669, 0002976874

モバイルアクセス技術
尾上誠藏; 山尾泰
2001, 電子情報通信学会誌, 84, 2, 112-118, Japanese, Introduction other

The future generations of mobile communications based on broadband access technologies
S Ohmori; Y Yamao; N Nakajima
The forthcoming mobile communication systems are expected to provide a wide variety of services, from high-quality voice to high-definition videos, through high-data-rate wireless channels anywhere in the world. The high data rate requires broad frequency bands, and sufficient broadband can be achieved in higher frequency bands such as microwave, Ka-band, and millimeter-wave. Broadband wireless channels have to be connected to broadband fixed networks such as the Internet and local area networks. The future-generation systems will include not only cellular phones, but also many new types of communication systems such as broadband wireless access systems, millimeter-wave LANs, intelligent transport systems, and high altitude stratospheric platform station systems. Key to the future generations of mobile communications are multimedia communications, wireless access to broad-band fixed networks, and seamless roaming among different systems. This article discusses future-generation mobile communication systems., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, Dec. 2000, IEEE COMMUNICATIONS MAGAZINE, 38, 12, 134-142, English, Introduction other, 0163-6804, WOS:000165603500014

ITU-Rでの勧告化が行われた高速ページング方式（FLEX-TD）
山尾泰
日本ITU協会, 1998, ITUジャーナル, 28, 6, 28-31, English, Introduction other, 0916-7544, 40004909500, AN10358835

FLEX-TD-Unified Japanese Standard for High-Speed Paging（中国語）
山尾泰
1997, 世界電信, 10, 3, 39-41, Japanese, Introduction other

高度無線呼出システムの標準化状況と技術展望
山尾泰
1996, 電子情報通信学会誌, 79, 3, 272-281, Japanese, Introduction other

移動通信用高周波回路技術の現状と動向
野島俊雄; 山尾泰; 小林 喜夫
1989, 電子情報通信学会誌, 72, 9, 1007-1013, Japanese, Introduction other

Fundamentals of Wireless Communication
Atsushi Murase; Yasushi Yamao
Scholarly book, Japanese, Joint work, Chap.13, オーム社, Nov. 2014, 9784274216558

モバイル通信の無線回路技術
野島俊雄; 山尾泰; 高野健; 伊東健治; 楢橋祥一
Japanese, Editor, 電子情報通信学会, Sep. 2007

無線技術のその応用2-移動体通信
正村達郎編
Japanese, Joint work, 第１章 移動体通信の変遷, 丸善, Jan. 2006

2015年の情報通信技術
NTT技術予測研究会
Japanese, Joint work, NTT出版, Sep. 2001

パーソナルマルチメディア通信絵解き読本
水沢純一; 関口英生; 佐藤英昭; 吉本晃; 中嶋昭久; 山尾泰; 舘田良文; 加井謙二郎
Japanese, Joint work, 第６章 ポケットベル（ページャ）, オーム社, Jun. 1995

Evaluation of V2I Broadcast with TC-IF Multi-Hop Forwarding
Ryousuke KATSUMATA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2019

SF-SFB DPD for Compensating Nonlinearity with Memory Effects in Wideband Transmitter
Suguru HABU; Yasushi YAMAO; Hiroshi SUZUKI
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2019

5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells
Morihiko Minowa; Hiroyuki Seki; Yukihiko Okumura; Satoshi Suyama; Jun Terada; Satoshi Shigematsu; Yasushi Takatori; Hiroaki Asano; Yukio Hirano; Yasushi Yamao; Fumiyuki Adachi; Masataka Nakazawa
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2019

Multiband RF Hardware Techniques for 5G Mobile Communication Systems
Yasushi YAMAO; Kazuhiko HONJO; Ryo ISHIKAWA; Yoichiro TAKAYAMA; Akira SAITO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2019

Improvement on Bandwidth Uniformity and Attenuation Sharpness in Reconfigurable BRF by Inter-stage Staggering Design
Yusuke IMAI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Convention 2019, Domestic conference
Mar. 2019

5G R&D activities for high capacity technologies with ultra high-density multi-band and multi-access layered cells
Morihiko Minowa; Hiroyuki Seki; Yukihiko Okumura; Satoshi Suyama; Jun Terada; Satoshi Shigematsu; Yasushi Takatori; Hiroaki Asano; Yukio Hirano; Yasushi Yamao; Fumiyuki Adachi; Masataka Nakazawa
Oral presentation, Japanese, IEICE Convention 2019, Domestic conference
Mar. 2019

Nonlinear Compensation for Broadband and Multiband Wireless Systems
Y. Yamao
Public discourse, Japanese, MWE2018 Workshop Digest, Invited, IEICE, Yokohama, Domestic conference
28 Nov. 2018

SHF 3-bit Reconfigurable Band Rejection Filter Using Variable-Length λ/4 Anti-Resonators and LC Parallel Coupling
Yusuke IMAI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2018

Low SHF Band 3-bit Reconfigurable BPF Design Employing pHEMT RF Switch Arrays
Naoto AKUTSU; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2018

Spectrum-Decomposed Parallel Signal Processing for Broadband Nonlinear Compensation
Tomoki ABE; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical report, Domestic conference
Nov. 2018

Radio Propagation and Reading Rate Improvement of 920 MHz RFID －A Case Study for Metallic Storage Shelf－
Sora FUNAYAMA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Nov. 2018

５Ｇに向けた増幅回路技術 -２.広帯域・マルチバンド非線形補償技術-
Yasushi YAMAO
Public discourse, Japanese, MWE Workshop, Domestic conference
Nov. 2018

Future of Mobile Communications
Yasushi Yamao
Nominated symposium, Japanese, 無線システム研究会30周年記念シンポジウム, Invited, IEICE, Tokyo, Domestic conference
20 Oct. 2018

Wireless Communications on IoT - From Micro- and Macro-Scopic Standpoints Related to Radio Propagation -
Yasushi Yamao; takeo Fujii
Nominated symposium, Japanese, 第9回横幹連合コンファレンス, Invited, TraFST, Tokyo, Domestic conference
06 Oct. 2018

Band-Split Parallel Signal Processing for Nonlinear Compensation of Broadband RF Signal
Tomoki ABE; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2018, Domestic conference
Sep. 2018

Radio Propagation and Reading Rate Characteristics of 920 MHz RFID on Metal Shelf
Sora FUNAYAMA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2018, Domestic conference
Sep. 2018

Road to Vehicle Communication by Time-Controled Irresponsible Forwarding (TC-IF) Method
Ryousuke KATSUMATA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2018, Domestic conference
Sep. 2018

RF Hardware Techniques for 5G Mobile Communications
Y. Yamao
Public symposium, English, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applications 2018, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applications 2018, Ting Tao, China, International conference
20 Aug. 2018

A Study on DPD Configuration for Beamforming Transmitter
Suguru HABU; Yasushi YAMAO; Hiroyoshi ISHIKAWA; Toru MANIWA
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Jul. 2018

Information Delivery Delay Reduction by Relay-Assisted Inter-Vehicle Broadcast Communications in Urban Environment with Sectorized Relay Station
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Apr. 2018

Propagation Characteristic of V2V Communications in Right-Turn Accident Prevention Scenario
Yosuke Kikuchi; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Apr. 2018

Relay-Assisted Techniques in Vehicle to Vehicle Communications - Achieving Reliable and Low Delay Broadcast Communication-
Yasushi YAMAO
Invited oral presentation, Japanese, IEICE Technical Report, Invited, Domestic conference
Apr. 2018

Effect of RREP Retransmission on Route Construction of Reactive Routing Ad Hoc Network
Masahiro HAYASHI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2018

Study on Signal Processing Bandwidth Necessary for Digital Predistortion
Tomoki ABE; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2018, Domestic conference
Mar. 2018

Analysis of Signal Processing for Spectrum-Folding Scalar-Feedback DPD
Suguru HABU; Yasushi YAMAO; Hiroshi SUZUKI
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Feb. 2018

Direct Parallel Coupling SHF Dual-band Reconfigurable Bandpass Filter
Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2017

Design and Experiment of 3-bit Reconfigurable Band Rejection Filter with Switched Open Stub Anti-Resonator
Yusuke IMAI; Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2017

Analysis of Influence of RF Switch Parasitic Elements on Reconfigurable BPF Performance
Naoto AKUTSU; Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2017

Blind Nonlinear Compensation Performance for RF Receiver Using Sub-Nyquist Sampling Method
kan Kimura; Yasushi YAMAO
Oral presentation, Japanese, IEICE technical report, Domestic conference
Oct. 2017

Sub-Nyquist Sampling Blind Nonlinear Compensation Signal Processing for RF Receiver
kan Kimura; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2017, Domestic conference
Sep. 2017

Propagation Characteristic for Turn Right Accident Scenario in Urban Area
Yosuke Kikuchi; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2017, Domestic conference
Sep. 2017

Spectrum-Folding Scalar-Feedback DPD for Wideband Mobile Communication System with Sectorized Relay Station
Suguru HABU; Caoyu LI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Jul. 2017

Geographical Cooperation of Packet Relay-Assisted V2V Communication in Urban Environment with Sectorized Relay Station
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Apr. 2017

Ultra-Wideband Nonlinear Radio Signal Processing by Spectrum Folding Scalar Feedback DPD
Suguru HABU; LI Caoyu; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2017, Domestic conference
Mar. 2017

Dynamic Multi-Hop Network Using Intra-Flow Interference Canceller in Distributed Node Placement
Yusuke SUNADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2017, Domestic conference
Mar. 2017

Effect of Parasitic Elements of RF Switch on Reconfigurable BPF Performance
Naoto AKUTSU; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2017, Domestic conference
Mar. 2017

Effect of Chip Dimensions on Low-SHF Reconfigurable Bandpass Filter
Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2017, Domestic conference
Mar. 2017

SHF 3-bit Reconfigurable Band Rejection Filter
Yusuke IMAI; Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2017, Domestic conference
Mar. 2017

Elastic FDTD Analysis of Signal Transmission in Ultrasonic Conversion Wireless relay System
Masahiro KANEKO; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Jan. 2017

Analysis of Route Construction Success Probability in Ad Hoc Networks Employing Reactive Routing Protocol with Delay Control
Masahiro HAYASHI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Dec. 2016

Delay Reduction by Relay-Assisted Broadcast Transmission for Dependable ITS V2V Communications
Yasushi YAMAO; Le Tien TRIEN; Takeo FUJII; Koji ISHIBASHI
Oral presentation, Japanese, IEICE Technical Report
Dec. 2016

Role of Telecommunications in The Next Generation Mobility and Logistic Systems
Y. Yamao
Nominated symposium, Japanese, IEICE Special Symposium in CEATEC 2016, IEICE, Tokyo, Domestic conference
Oct. 2016

Dual-Band Reconfigurable BPF Design for Multi-Band and Multi -Access Layered Cellular Radio
Yasushi YAMAO; Yuki KADA
Oral presentation, Japanese, IEICE Society Convention 2016, Domestic conference
Sep. 2016

A Study on Amount of Signal Processing of Dual-band Blind Nonlinear Compensation
kan Kimura; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convention 2016, Domestic conference
Sep. 2016

Issues for Multi-Band Multi-Access Radio Circuits in 5G Mobile Communication
Y. Yamao
Public symposium, English, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applications 2016, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applications 2016, International conference
Aug. 2016

Geographical Resource Allocation Based Packet Relay-Assist Scheme with Multiple Sectorized Relay Stations for ITS V2V Communication with Sectorized Relay Station
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Jul. 2016

Low-SHF Reconfigurable Bandpass Filter Using Chip Inductors As Coupling Circuits
Yuki KADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Jul. 2016

Performance Analysis of Dynamic Multi-Hop Network Using Intra-Flow Interference Canceller
Yusuke SUNADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Tech. Report, Domestic conference
Jun. 2016

Analysis of Routes in Dynamic Multi-Hop Network with Threshold Controlled Routing Algorithm
Jin Watanabe; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Invited
Mar. 2016

A Study of Broadcast V2M Communication System with Ad Hoc Forwarding
Keisuke HIROSE; Koji ISHIBASHI; Yasushi YAMAO; Yasuhiro HIRAYAMA; Tsuneo NAKATA
Oral presentation, Japanese, IEICE Technical Report
Mar. 2016

5G R&D Activities for Systems control technologies in Multi-Band and Multi-Access Layered Cells
Y. Ichikawa; H. Asano; Y. Morihiro; Y. Okumura; T. Ichikawa; M. Mizoguchi; T. Maniwa; Y. Yamao; K. Honjo
Oral presentation, Japanese, IEICE General Conference 2016, Domestic conference
Mar. 2016

EPWM-OFDM RoF Transmission System Using Adaptive Optical Power Feed
Yuta IIDA; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2016, Domestic conference
Mar. 2016

Influence of Packet Collision for RREQ Flooding in Ad Hoc Network Routing
Masahiro HAYASHI; Yusuke SUNADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE General Conference 2016, Domestic conference
Mar. 2016

Performance of CSMA/CA Packet Relay Assisted V2V Communication with Sectorized Relay Station
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Feb. 2016

5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells
Morihiko Minowa; Hiroyuki Seki; Yukihiko Okumura; Satoshi Suyama; Akihiro Otaka; Shunji Kimura; Masashi Nakatsugawa; Hiroaki Asano; Yasufumi Ichikawa; Yukio Hirano; Yasushi Yamao; Fumiyuki Adachi; Masataka Nakazawa
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Dec. 2015

A Study on Radio Propagation Simulation for Smart Meter in Apartment
Nodoka Nakagaki; Yasushi YAMAO; Reina NAGAYAMA; Takuya KAWATA
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Nov. 2015

Ultrasonic IF Conversion Wireless Relay System for Narrowband OFDM Signal
Masahiro KANEKO; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convension 2015, Domestic conference
Sep. 2015

A Study on Radio Propagation Analysis for Smart Meters in Apartments
Nodoka Nakagaki; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convension 2015, Domestic conference
Sep. 2015

Dynamic Multi-Hop Network Using Intra-Flow Interference Canceller
Yusuke SUNADA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convension 2015, Domestic conference
Sep. 2015

EPWM-OFDM RoF Transmission System Using Optical Power Feeding
Yuta IIDA; Tommomi SHINOMIYA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convension 2015, Domestic conference
Sep. 2015

A Simple DPD for Nonlinear Compensation for Beamforming Transmitter
Toshiki Hamanaka; Yasushi Yamao; Yuelin Ma; Koki Tanji; Eiichiro Otobe
Oral presentation, Japanese, IEICE Technical Report, 電子情報通信学会, 釧路, Domestic conference
Jul. 2015

Trends in ITS Wireless Communication Technology -Toward Automated Driving System-
Yasushi Yamao; Sadao Obana
Invited oral presentation, Japanese, IEICE Technical Report, Invited, Domestic conference
Apr. 2015

Power Amplifier Linearization Using Digital Predistortion Technology: Practical Development and Implementation Issues
Yuelin Ma; Yasushi Yamao
Invited oral presentation, English, IEICE Technical Report, Invited, Domestic conference
Mar. 2015

Radio Over Fiber Access Network Concept Employing Analog RoF and Optical Power Feed Techniques for Enhanced Mobile Communication Systems
Yasushi Yamao; Naoto Kishi; Eiji Oki; Motoharu Matsuura
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2015

Bandwidth Deviation Controlled Reconfigurable Bandpass Filter Using LC Parallel Coupling Circuit
Takumi Kato; Ryosuke Kobayashi; Tetsunari Saito; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2015

Reconfigurable Resonator with Wide Frequency Selectivity Employing /2 and /4 resonant modes
Tetsunari Saito; Takumi Kato; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2015

A Simple Nonlinear Compensation Method for Beamforming Transmitter
Toshiki Hamanaka; Yuelin Ma; Yasushi Yamao; Koki Tanji; Eiichiro Otobe
Oral presentation, Japanese, IEICE General Conference 2015, Domestic conference
Mar. 2015

FPGA Design of ANC-EPWM Transmitter
Takashi Funabashi; Yuelin Ma; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jan. 2015

車両－路側設置デバイス間（V2M）通信システム 〜 IEEE 802.15.4/ZigBeeを改良した場合の特性 〜
Yasushi Yamao
Invited oral presentation, Japanese, RCC Workshop, Invited, IEICE, Domestic conference
Jan. 2015

Vehicle Roadside Device Communication (V2M) System - Performance with Improved IEEE 802.15.4/ZigBee -
Yasushi Yamao
Invited oral presentation, Japanese, IEICE Technical Report, Invited, Domestic conference
Jan. 2015

V2M Communication Performance Improvement by Fast Handover Method
Keisuke HIROSE; Koji ISHIBASHI; Yasushi YAMAO; Yasuhiro HIRAYAMA; Manabu SAWADA
Oral presentation, Japanese, IEICE Technical Report
Dec. 2014

Packet Combining Relay Scheme with Sectorized Relay Station for Reliable V2V Communication
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2014

Recent ITS Research and Development in Japan
Yasushi Yamao
Invited oral presentation, English, ACOMP2014, Invited, Faculty of Computer Science and Engineering, Hochiminh City University of Technology, Hochiminh City, Vietnam, International conference
Nov. 2014

Improved Packet Combining Relay Scheme in ITS V2V Broadcast Communication
Le Tien TRIEN; Yasushi YAMAO
Oral presentation, Japanese, IEICE Society Convension 2014, Domestic conference
Sep. 2014

Dynamic Multi-Hop Network with Threshold Controlled Routing Algorithm
Jin Watanabe; Yuki Matsuzawa; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Invited
Jun. 2014

ZigBee based M2M Network Consisting of Multiple Vehicles and Roadside Devices
Keisuke HIROSE; Koji ISHIBASHI; Yasushi YAMAO; Yasuhiro HIRAYAMA; Manabu SAWADA
Oral presentation, Japanese, IEICE Technical Report, Invited
Jun. 2014

Improvement of Inter-Vehicle Broadcast Communication by Sectorized relay Station
CHENG Huiting; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Invited
Apr. 2014

Intra-Flow Interference Cancellation with MRC for Highly Efficient Multi-Hop Transmission
Jingze Dai; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report, Domestic conference
Mar. 2014

ICT国際PBL(4):ディジタル信号処理
福井言葉; 船橋鴻志; 高橋謙三; 山尾 泰; 小島年春; 崎山一男
Oral presentation, Japanese, 2014信学総大
Mar. 2014

ICT国際PBL (2)：無線ネットワークによるロボットカー制御プロジェクト
大竹健太; 稲毛 契; 戴 競擇; 藤井威生; 山尾 泰; 崎山一男
Oral presentation, Japanese, 2014信学総大
Mar. 2014

ICT国際PBL (1)：国際性と実践力に優れた高度専門人材育成
稲毛契; 藤井威生; 高橋謙三; 山尾泰; 崎山一男
Oral presentation, Japanese, 2014信学総大
Mar. 2014

並列共振結合回路を用いたリコンフィギャラブルバンドパスフィルタの帯域幅偏差抑制の検討
加藤匠; 小林綾介; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

集中定数化3ビットリコンフィギャラブルバンドパスフィルタ
小林綾介; 加藤匠; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

閾値制御経路構築アルゴリズムを用いた動的経路飛越法
渡邊仁; 松澤祐貴; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

大規模無線センサーネットワークの構成法とスループットの検討
小林翔; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

機器間通信のための超音波IF変換を用いたワイヤレス中継方式の一検討
筒井康介; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

零点を有する2次Δ-Σ変調器を用いたEPWM送信回路のFPGA設計
船橋鴻志; 馬岳林; 山尾泰
Oral presentation, Japanese, 2014信学総大
Mar. 2014

Blind Nonlinear Comepensation Technique for RF Receiver Front-End
Yuelin Ma; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jan. 2014

Study on Airtime Occupancy Ratio in ITS V2V Broadcast Communication
Le Tien TRIEN; Huiting CHENG; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2013

Multi-Hop Transmission Performance of Integrated Dynamic Multi-Hopping in Shadowing Environment
Yuki Matsuzawa; Yasushi Yamao; Kenta Otake; Koji Ishibashi
Oral presentation, Japanese, IEICE Technical Report
Dec. 2013

Performance of Cognitive Temporary Bypassing Method Considering Location of Neighbor Nodes
Kenta Otake; Yuki Matsuzawa; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Dec. 2013

A Bandwidth Control Design of Reconfigurable Bandpass Filter Using J-Inverter
Takumi Kato; Ryosuke Kobayashi; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Nov. 2013

Lumped Circuit Three-Bit Reconfigurable Resonator
Ryosuke Kobayashi; Takumi Kato; Yasushi Yamao
Oral presentation, Japanese, 2013信学ソ大
Sep. 2013

Transmission Performance of Dynamic Multi-Hop Shortcut for Wireless Ad Hoc Networks
Yuki Matsuzawa; Koji Ishibashi; Yasushi Yamao
Oral presentation, Japanese, 2013信学ソ大
Sep. 2013

EPWM-OFDM Transmission against Nonlinearity and Echo in Radio over Fiber Channel
Xiaoxue Yu; Yasushi Yamao; Motoharu Matsuura
Oral presentation, English, IEICE Society Convension
Sep. 2013

安全運転支援を中心としたITSの通信技術の動向と今後の展開
Yasushi Yamao
Others, Japanese, SMART TECHNOLOGY FORUM 2013, UEC
Sep. 2013

EPWM-RoF Transmission of OFDM Signal for Heterogeneous Wireless Environment
Y. Yamao
Public symposium, English, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applicaions 2013, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applicaions 2013
Aug. 2013

Analysis of Packet Transmission Errors between End Devices for Power Saving Ubiquitous Network using Spread Spectrum
Shuntaro KASAI; Sho KOBAYASHI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Jun. 2013

A Proposal of Modified LDGM Code for Superimposed Adaptive Network Coded Cooperation
Naoki Takeishi; Koji Ishibashi; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Jun. 2013

Development Trend in ITS Wireless Communication Technology for Safety Driving Support
Yasushi Yamao
Invited oral presentation, Japanese, RCS Workshop, Invited, IEICE, Domestic conference
Apr. 2013

Comprison of V2V Communication Reliability Improvements on Vehicle Grouping Methods at a Crossroads in V2V/I2V-Integrated ITS Communication System
Hideki Sugawara; Yasushi Yamao
Oral presentation, Japanese, 2013信学総大,2013信学総大
Mar. 2013

Amplify and Forward Relay Transmission via Frequency Conversion
Suhang Zhang; Yoshihiko Akaiwa; Yasushi Yamao
Oral presentation, Japanese, 2013信学総大,2013信学総大
Mar. 2013

Quantization Noise Characteristics of PMC-EPWM Transmitter using Modulated Carrier Clock
Rui Jiang; Yasushi Yamao
Oral presentation, Japanese, 2013信学総大,2013信学総大
Mar. 2013

Superimposed Adaptive Network Coded Cooperation using Higher-Order Modulation
Naoki Takeishi; Koji Ishibashi; Yasushi Yamao
Oral presentation, Japanese, 2013信学総大,2013信学総大
Mar. 2013

ANC-EPWM Transmitter Employing 3rd-order Delta-Sigma Modulator
Koji Iwaki; Takashi Funabashi; Yasushi Yamao
Oral presentation, Japanese, 信学技法,信学技法
Feb. 2013

Nonlinear Compensation by Predistortor using Feedback Signal with Limited Bandwidth
Yuelin Ma; Yasushi Yamao; Yoshihiko Akaiwa
Oral presentation, Japanese, 信学技法,信学技法
Feb. 2013

RoF Transmission of OFDM SignalUsing EPWM for Heterogeneous Wireless Networks
Yasushi Yamao
Public symposium, English, Korea-Japan Joint Seminar on Future Heterogeneous Wireless Networks, JSPS and NRF, Naha, Okinawa
Jan. 2013

Packet Relay Scheme with Payload Combining in ITS V2V Broadcast Communications
Le Tien TRIEN; Hideki SUGAWARA; Huiting CHENG; Yasushi YAMAO; Yasuhiro HIRAYAMA; Manabu SAWADA
Oral presentation, Japanese, IEICE Technical Report
Dec. 2012

Development of Wide Area and Reliable ZigBee-based Sensor Network with Router Duplication
Sho KOBAYASHI; Takaaki SUZUKI; Nobuo NAKAJIMA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2012

An Intelligent WDN for Future Ubiquitous Society
Yasushi Yamao
Public symposium, English, Workshop of MMU, Malaysia Multimedia University, Kuala Lumpur, Marasia
Oct. 2012

Performance of Three-Bit Reconfigurable Band-Pass Filter using Branch-Line Type Variable Resonator
Ryosuke Kobayashi; Kazuhiro Azuma; Yasushi Yamao
Oral presentation, Japanese, 2012信学ソ大,2012信学ソ大
Sep. 2012

Overcoming Nonlinearity Issues in Broadband Wireless Communication Systems
Y. Yamao
Public symposium, English, Ist Workshop of Sino-Japan Joint Fund Project on Future Wireles Communications, University of Electronic Science and Technology of China (UESTC), Chengdu, China
Aug. 2012

Three-bit Reconfigurable Band-Pass Filter using Branch-Line Type Variable Resonator
Kazuhiro Azuma; Ryosuke Kobayashi; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jul. 2012

Analysis of Interference between End Devices for Cluster-Tree Ubiquitous Network
SeongWon Go; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jun. 2012

Performance Evaluation of Cognitive Temporary Bypassing Method Considering Control Message Error
Kenta Otake; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jun. 2012

Performance Improvement with Integrated Dynamic Multi-Hopping Scheme in Shadowing Environment
Yuki Matsuzawa; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jun. 2012

Packet Delivery Rate of CSMA/CA Broadcast V2V Communication around Crossroads
Takahiko Matsunaka; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jun. 2012

Performance of CSMA/CA Multi-Hop Network Considering Intra-Flow Interference under Fading Environment
Jingze Dai; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jun. 2012

ANC-EPWM Transmission of OFDM Signal in RoF Channel
Xiaoxue Yu; Motoharu Matsuura; Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, English, IEICE Technical Report
Apr. 2012

ANC-EPWM Transmitter Using Maximally Flat IIR Filter
Koji Iwaki; Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, Japanese, 信学技法,信学技法
Mar. 2012

Effect of Distance Decay Index on Interference for Large Scale Ubiquitous Network
SeongWon Go; Yasushi Yamao
Oral presentation, Japanese, 2012信学総大,2012信学総大
Mar. 2012

Effect of Control Message Error on the Performance of Cognitive Temporary Bypassing Method
Kenta Otake; Yasushi Yamao
Oral presentation, Japanese, 2012信学総大,2012信学総大
Mar. 2012

Two-bit Variable Frequency Bandpass Filter with Parallel Transmission Line Coupling
Takayuki Arai; Yasushi Yamao
Oral presentation, Japanese, 2012信学総大,2012信学総大
Mar. 2012

Transmission Performance of Integrated Dynamic Multi-Hopping in Shadowing Environment
Yuki Matsuzawa; Yasushi Yamao
Oral presentation, Japanese, 2012信学総大,2012信学総大
Mar. 2012

安全運転支援通信システムを中心とした ITSの無線通信技術の現状と将来
Yasushi Yamao
Invited oral presentation, Japanese, ITS研究会, IPS
Mar. 2012

ワイヤレスコミュニケーションの現状と新たな展開
Yasushi Yamao
Others, Japanese, 無線ブロードバンド活用セミナー, 総務省関東総合通信局
Mar. 2012

Suppression of Quantization Noise for EPWM Transmitter with Saturated Power Amplifier
Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, Japanese, 信学技法,信学技法
Nov. 2011

Performance Analysis of CSMA/CA Broadcast Relay Network for ITS V2V communications
Huiting Cheng; Hideki Sugawara; Yasushi Yamao
Oral presentation, English, IEICE Technical Report
Oct. 2011

Suppression of Quantization Noise for ANC-EPWM Transmitter with Saturated Power Amplifier
Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, Japanese, 2011信学ソ大,2011信学ソ大
Sep. 2011

Nonlinear RoF Transmission of EPWM-OFDM Signal
Xiaoxue Yu; Motoharu Matsuura; Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, English, Proc. IEICE Society Conference 2011
Sep. 2011

Three-bit Variable Frequency Resonator using Tapped Transmission Line and RF Switches
Kazuhiro Azuma; Ryosuke Kobayashi; Yasushi Yamao
Oral presentation, Japanese, 2011信学ソ大,2011信学ソ大
Sep. 2011

Theoretical Analysis of Throughput in Multi-Code Reception SS-CSMA/CA with Group Acknowledgment Method
Masaki Takamori; Yasushi Yamao
Oral presentation, Japanese, 2011信学ソ大,2011信学ソ大
Sep. 2011

Collision Avoidance of V2V Broadcast Communication by Controlling Minimum Contention Window Size
Hideki Sugawara; Yasushi Yamao
Oral presentation, Japanese, 2011信学ソ大,2011信学ソ大
Sep. 2011

An Intelligent WDN for Future Ubiquitous Society
Yasushi Yamao
Invited oral presentation, English, CSIE2011, 2011 2nd World Congress on Computer Science and Information Engineering (CSIE2011), Changchun, China, International conference
Sep. 2011

A Cross-Layer Design for Cognitive Wireless Distributed Networks
Yasushi Yamao
Invited oral presentation, English, TriSAI2011, Triangle Symposium for Advanced ICT 2011 (TriSAI2011), Daejeon, Korea, International conference
Aug. 2011

"Cognitive" Wireless Network
Yasushi Yamao
Invited oral presentation, Japanese, RCS Workshop, Invited, IEICE, Domestic conference
Jul. 2011

Reduction of V2V Packet Collision Due to Traffic Concentration in Integrated V2V/I2V ITS Communication System
Hideki Sugawara; Kazuya Minato; Yasushi Yamao
Oral presentation, Japanese, IRICE Technical Report
Jun. 2011

CSMA/CA Performance under Rayleigh Fading Environment with Two-Dimensional Distribution of Hidden Terminal
Jingze DAI; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Jun. 2011

Effect of Analog Predistortion Linearizer in Quasi Saturation Region of RF Power Amplifier
Xi CHEN; Yasushi Yamao
Oral presentation, English, IEICE Technical Report
May 2011

Suppression of Quantization Noise for EPWM Transmitter
横澤真介; 山尾泰
Oral presentation, Japanese, 信学技報,信学技報
Mar. 2011

Fixed-Point Arithmetic Operation of Delta-Sigma Modulators for EPWM Transmitter
Koji Iwaki; Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, Japanese, 2011信学総大,2011信学総大
Mar. 2011

Improvement of V2V Packet Transmission Success Rate for Integrated V2V/I2V ITS Communication System
Hideki Sugawara; Kazuya Minato; Yasushi Yamao
Oral presentation, Japanese, 2011信学総大,2011信学総大
Mar. 2011

Proximity Relay and Shortcut Routing for Wireless Ad-Hoc Network
Takashi Magome; Yasushi Yamao
Oral presentation, Japanese, 2011信学総大,2011信学総大
Mar. 2011

Packet Loss Analysis for Cluster-Tree Wireless Network with TGA-SS-CSMA/CA
Yunjuan Xue; Naoto Kobatake; Yasushi Yamao
Oral presentation, English, Proc. IEICE General Conference 2011
Mar. 2011

Throughput and Delay Performance of Multi-Code Reception SS-CSMA/CA with Group Acknowledgement Method
Masaki TAKAMORI; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Dec. 2010

Performance Analysis of MCR-SS-CSMA/CA for Cluster-Tree Wireless Networks
Yunjuan Xue; Naoto Kobatake; Yasushi Yamao
Oral presentation, Japanese, IRICE Technical Report
Dec. 2010

Analysis of Hidden Terminal Effect for CSMA/CA Distributed Network Suffering from Rayleigh Fading
Jingze DAI; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Dec. 2010

Theoretical Analysis of Broadcast Packet Delivery Rate in ITS V2V Communication with CSMA/CA
Kazuya MINATO; Jingze DAI; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Dec. 2010

Burst RF Signal Amplification for EPWM Transmitter
Shuichiro Takahashi; Yasushi Yamao
Oral presentation, Japanese, IRICE Technical Report
Nov. 2010

Three-bit Variable Frequency Resonator using Tapped Transmission Line and RF Switches
Jun-ichi Ohtsuka; Hiroki Mori; Yasushi Yamao
Oral presentation, Japanese, 2010信学ソ大,2010信学ソ大
Sep. 2010

Bandwidth Control of Two-bit Variable Frequency Bandpass Filter by Switching Inter-Stage Capacitance
Takayuki Arai; Hiroki Mori; Yasushi Yamao
Oral presentation, Japanese, 2010信学ソ大,2010信学ソ大
Sep. 2010

Prototype of Two-Bit Variable Frequency Resonator Using Three-Layered Structure Offset Strip Line
Hiroki Mori; Mitsuhiro Fushimi; Yasushi Yamao
Oral presentation, Japanese, 2010信学ソ大,2010信学ソ大
Sep. 2010

Transmission Delay of Multi-Code SS-CSMA/CA with Group Acknowledgement Method
Masaki Takamori; Yasushi Yamao
Oral presentation, Japanese, 2010信学ソ大,2010信学ソ大
Sep. 2010

Suppression of Quantization Noise for EPWM Transmitter employing 2nd-order Δ-Σ Modulator with Null-Response Frequency
Shinsuke Yokozawa; Yasushi Yamao
Oral presentation, Japanese, 2010信学ソ大,2010信学ソ大
Sep. 2010

Cross-Layer Multi-Hop Packet Transmission Scheme incorporating Route-Shortcut and Bypass Functions
Yasushi YAMAO; Yutaro KIDA; Yusuke KADOWAKI
Oral presentation, Japanese, IRICE Technical Report
Jul. 2010

A Novel Feedback Configured Predistorter for Power Amplifiers with Memory Effect
Yuelin Ma; Yoshihiko Akaiwa; Yasushi Yamao
Oral presentation, English, IEICE Technical Report
Jul. 2010

Performance of Dynamic Multi-Hopping Communication in Ad-Hoc Wireless Networks
Yusuke KADOWAKI; Yutaro KIDA; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Mar. 2010

Performance of Broadcast Transmission from Multiple Vehicles in Vehicle -Roadside -Vehicle Relay Communication Network employing Multiple Frequencies
Kazuya Minato; Yasushi Yamao
Oral presentation, Japanese, 2010信学総大,2010年総合全国大会
Mar. 2010

Generation of OFDM Signal by EPWM Transmitter with Clipping and Filtering
川添浩司; エドウィン ウマリ; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Suppression of Quantization Noise of EPWM Transmitter around Carrier Frequency
横澤真介; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Multi-Hop Wireless Transmission Method incorporating Route-Shortcut and Bypass Functions
木田祐太郎; 門脇裕介; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Effect of Group ACK for Wireless Networks Employing Multi-Code SS-CSMA/CA
高森昌樹; 小畠直人; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Delay Analysis of MCR-SS-CSMA/CA for Cluster-Tree Wireless Networks
Y. Xue; N. Kobatake; Y. Yamao
Oral presentation, English, Proc. IEICE General Conference 2010
Mar. 2010

Two-bit Variable Frequency Band Pass Filter using High- Print Circuit Board
大塚純一; 森弘樹; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Bandwidth Control Two-bit Variable Frequency Resonator with Switched Capacitance of Coupling Capacitor
新井貴之; 森弘樹; 大塚純一; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Two-bit Variable Frequency Resonator using Offset Strip Line
伏見光裕; 森弘樹; 大塚純一; 山尾泰
Oral presentation, Japanese, 2010信学総大,2010信学総大
Mar. 2010

Time Group Access SS-CSMA/CA for High-Throughput Layerd-Tree Wireless Ad Hoc Networks
Naoto KOBATAKE; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Dec. 2009

Two-Stage Reconfigurable Bandpass Filter using Two-Bit Variable-Length Transmission Line Resonator
Hiroki MORI; Jun-ichi OHTSUKA; Ryota FUKUDA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Nov. 2009

Downlink DSTBC-WCDMA Performance in Fast-Varying Time-Dispersive Channels
Edwin M. Umali; Yasushi Yamao
Oral presentation, English, IEICE Technical Report
Oct. 2009

Noise Characteristics of OFDM Signal Generated by EPWM Transmitter after Clipping and Filtering
Koji KAWAZOE; Edwin M. UMALI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Oct. 2009

Analysis of Hidden Terminal Effect on CSMA/CA Network under Fading Environment
Y. Yamao
Public symposium, English, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applicaions 2009, Shino-Japan Workshop on the Next Generation Mobile Communication Technologies and Applicaions 2009
Sep. 2009

Two-stage Band Pass Filter by Two-bit Variable Frequency Resonator
Jun-ichi Ohtsuka; Hiroki Mori; Yasushi Yamao
Oral presentation, Japanese, 2009信学ソ大,2009信学総大
Sep. 2009

Time Group Access SS-CSMA/CA for High-Throughput Wireless Ad Hoc Networks with Layered-Tree Structure
Naoto Kobatake; Satoru Takagishi; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2009

ITS V2V Communication Network employing Vehicle-to-Roadside-to-Vehicle Relay with Multiple Frequency Bands
Kazuya Minato; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report
Jul. 2009

Vehicle-to-Roadside-to-Vehicle Relay Communication Network Employing Multiple Frequencies
Kazuya Minato; Yasushi Yamao
Oral presentation, Japanese, 2009信学総大,2009年総合全国大会
Mar. 2009

S-parameters of Two-bit Variable Frequency Resonator
Ryota Fukuda; Jun-ichi Ohtsuka; Hiroki Mori; Yasushi Yamao
Oral presentation, Japanese, 2009信学総大,2009信学総大
Mar. 2009

Two-bit Variable Frequency Resonator using High-e Print Circuit Board
Hiroki Mori; Jun-ichi Ohtsuka; Ryota Fukuda; Yasushi Yamao
Oral presentation, Japanese, 2009信学総大,2009信学総大
Mar. 2009

Advances in Radio Frequency Circuits for Mobile Communications
Yasushi Yamao
Invited oral presentation, Japanese, 2009信学総大依頼シンポジウム, 2009信学総大依頼シンポジウム
Mar. 2009

Performance of SS-CSMA/CA for Cluster-Tree Wireless Networks
Naoto KOBATAKE; Satoru TAKAGISHI; Yasushi YAMAO
Oral presentation, Japanese, IRICE Technical Report
Mar. 2009

Noise Characteristics of OFDM Signal Generated by EPWM Transmitter Employing Second-order Delta-Sigma Modulator with Null-Response Frequency
Koji KAWAZOE; Yoshikazu TOYAMA; Edwin M. UMALI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2008

Power Efficiency of Extended Doherty Transmitter with Different Operational Class Amplifiers for OFDM Signal Amplification
Yoshikazu TOYAMA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2008

Two-Bit Variable Frequency Resonator using Transmission Line and RF Switches
Jun-ichi OHTSUKA; Hiroki MORI; Ryota FUKUDA; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2008

Dynamic Multi-Hopping Method in Wireless Ad-Hoc Networks
Yusuke KADOWAKI; Kenichi NAGAO; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report
Dec. 2008

Multi-Hop Transmission Performance of Improved Cognitive Temporary Bypassing for Wireless Ad Hoc Networks
K. NAGAO; Y. KADOWAKI; Y. YAMAO
Oral presentation, Japanese, IEICE Technical Report
Oct. 2008

Influence of Predistortion on Average Power Efficiency of OFDM Amplification with Extended Doherty Transmitter
Yoshikazu Toyama; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

Noise Characteristics of EPWM Transmitter Employing 2nd-order Delta-Sigma Modulator with Null-Response Frequency
Koji Kawazoe; Yoshikazu Toyama; Edwin M.Umali; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

Two-bit Variable Frequency Resonator by λ/4 Resonance Mode
Jun-ichi Ohtsuka; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

Protocols Enabling Node Skip in Multi-Hop Wireless Networks
Yusuke Kadowaki; Kenichi Nagao; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

Simulation of Cognitive Temporary Bypassing for Wireless Ad Hoc Networks
Kenichi Nagao; Yusuke Kadowaki; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

SS-CSMA/CA MAC Protocol for Large-Scale and Low-Power Wireless Ad-hoc Networks
Satoru Takagishi; Naoto Kobatake; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

Network Throughput Analysis for Layerd-Tree Network with SS-CSMA/CA
Naoto Kobatake; Satoru Takagishi; Yasushi Yamao
Oral presentation, Japanese, IEICE
Sep. 2008

In-Band Noise Analysis and Peak-Clipping Effect on Envelope Pulse-Width Modulation (EPWM) Transmitter
E. M. Umari; K. Kawazoe; Y. Toyama; Y. Yamao
Oral presentation, English, IEICE Technical Report
Aug. 2008

Cognitive Multihop Communication in Wireless Ad Hoc Networks
Y. Yamao
Public symposium, English, Shino-Japan Workshop on Future Mobile Communication technologies, Applications and IPR Issues 2008, Shino-Japan Workshop on Future Mobile Communication Technologies, Applications and IPR Issues 2008
Jul. 2008

30 Years of Mobile Communications in Japan -Commemorating the 20th Anniversary of the RCS Tachnical committee-
Yasushi Yamao
Invited oral presentation, Japanese, RCS Workshop, IEICE, Domestic conference
May 2008

マルチホップネットワークにおける経路飛び越しを用いた伝送特性の改善
門脇 裕介; 長尾 研一; 山尾 泰
Oral presentation, Japanese, 2008信学総大
Mar. 2008

SS-CSMA/CA方式のスループット解析
小畠 直人; 高岸智; 山尾泰
Oral presentation, Japanese, 2008信学総大
Mar. 2008

包絡線パルス幅変調(EPWM)送信法によるOFDM信号の発生
川添浩司; 外山義和; エドウィン ウマリ; 山尾泰
Oral presentation, Japanese, 2008信学総大
Mar. 2008

2ビット周波数可変共振器による狭帯域周波数切替の検討
大塚純一; 山尾泰
Oral presentation, Japanese, 2008信学総大
Mar. 2008

Power Efficiency of Doherty, Extended Doherty and Delta-Sigma Envelope Pulse-Width Modulation (EPWM) Transmitters for OFDM Signal Amplification.
Yoshikazu TOYAMA; Edwin M. UMALI; Yasushi YAMAO
Oral presentation, Japanese, IEICE Technical Report on Radio Communications System
Jan. 2008

Delta-Sigma Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Linear Amplification
E. M. Umali; Y. Toyama; Y. Yamao
Oral presentation, English, IEICE Technical Report
Nov. 2007

Cognitive Temporary Bypassing for Reliable Transmission in Wireless Ad Hoc Networks
Kenichi Nagao; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report on Radio Communications System
Aug. 2007

Expansion of IEEE 802.15.4/ZigBee MAC Beacon Mode in Layered-Tree Networks with Time Shift Grouping Access
Satoru Takagishi; Yasushi Yamao
Oral presentation, Japanese, IEICE Technical Report on Radio Communications System
Jun. 2007

Ad-hoc wireless networks and cognitive radio toward future wireless networks
Takeo Fujii; Yasushi Yamao
Invited oral presentation, English, International Forum on 4th Generation Mobile Communications 2007, International Forum on 4th Generation Mobile Communications 2007, London, UK, International conference
Apr. 2007

IEEE 802.11a OFDM信号の拡張Doherty増幅時の平均電力効率
外山義和; 山尾泰
Oral presentation, Japanese, 2007信学総大,2007信学総大
Mar. 2007

Δ-Σ包絡線変調による飽和形高効率線形増幅法
大岩朝洋; 山尾泰
Oral presentation, Japanese, 2007信学総大,2007信学総大
Mar. 2007

レイリーフェージング環境下におけるスロット化CSMA/CAのスループット
高岸智; 山尾泰
Oral presentation, Japanese, 2007信学総大
Mar. 2007

AODVをベースとしたアドホックネットワークの自律的代替経路構築法
長尾研一; 山尾泰
Oral presentation, Japanese, 2007信学総大,2007信学総大
Mar. 2007

伝送線路上にシャントスイッチを設けた周波数可変共振器
辻丈比古; 山尾泰
Oral presentation, Japanese, 2007信学総大,2007信学総大
Mar. 2007

コグニティブ無線メッシュネットワークのためのマルチバンドルーティング法
藤井威生; 山尾泰
Oral presentation, Japanese, 2006信学通信ソ大,2006信学通信ソ大
Sep. 2006

Expecting Circuit and Device Technologies for Future Mobile Communication Systems.
山尾 泰
Invited oral presentation, Japanese, 電子デバイス研究会, 電気学会 電子デバイス研究会
Mar. 2006

Advances in Wireless Networks Towards a Ubiquitous World
Yasushi Yamao
Invited oral presentation, English, IEICE Lecture Meeting in Bandung, IEICE Indonesia Section and Bandung Institute of Technologies, Bandung, Indonesia, International conference
Feb. 2006

Advances in Wieless Networks
Yasushi Yamao
Invited oral presentation, English, International Symposium on Photonics and Advanced Networks (ISPAN 2006), International Symposium on Photonics and Advanced Networks (ISPAN 2006), Chofu. Tokyo, International conference
Jan. 2006

MEMSスイッチを用いたマルチバンド電力増幅器
福田敦史; 岡崎浩司; 楢橋祥一; 広田哲夫; 山尾泰
Oral presentation, Japanese, 信学技報
2005

歪成分の周波数依存性を補償するディジタルプリディストータの変調信号に対する歪補償効果
水田信治; 鈴木恭宜; 楢橋祥一; 山尾泰
Oral presentation, Japanese, 2005信学総大
2005

帯域切替型電力増幅器におけるスイッチの挿入損失の評価
福田敦史; 岡崎浩司; 楢橋祥一; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2005信学総大
2005

連続スペクトルを有する歪成分の周波数依存性を補償するディジタルプリディストータの周波数と癖英補償器の制御方法
水田信治; 鈴木恭宜; 楢橋祥一; 山尾泰
Oral presentation, Japanese, 2005信学通信ソ大
2005

MEMSスイッチを用いた高効率トリプルバンド電力増幅器
福田敦史; 岡崎浩司; 楢橋祥一; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2005信学通信ソ大
2005

Expansion of Future Mobile Toward Ubiquitous World
Y. Yamao
Invited oral presentation, English, VTC2004-Spring, Milan, panel session on "Technology and Innovations for Systems Beyond 3G, IEEE, International conference
2004

Expansion of Future Mobile Communication Towards a Ubiquitous World
Yasushi Yamao
Invited oral presentation, English, International Forum on 4th Generation Mobile Communications 2004, International conference
2004

MEMSスイッチを用いたマルチバンド電力増幅器
福田敦史; 高橋賢吉; 岡崎浩司; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2004信学総大
2004

MEMSスイッチによるスルー切替え機能を有する90度ハイブリッド回路
岡崎浩司; 福田敦史; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2004信学総大
2004

歪周波数特性補償型ディジタルプリディストータにおける高次歪補償の効果
水田信治; 鈴木恭宜; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2004信学総大
2004

コプレーナ型高温超伝導フィルタの耐電力化
佐藤圭; 小泉大輔; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2004信学総大
2004

MEMSスイッチを用いた高効率デュアルバンド電力増幅器
福田敦史; 高橋賢吉; 岡崎浩司; 楢橋祥一; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2004信学通信ソ大
2004

バンド切替型マルチバンド電力増幅器におけるスイッチ特性の評価
福田敦史; 高橋賢吉; 岡崎浩司; 楢橋祥一; 山尾泰
Oral presentation, Japanese, 2004信学通信ソ大
2004

歪成分の周波依存性を補償するディジタルプリディストータの歪補償の周波数特性
鈴木恭宜; 水田信治; 山尾泰; 楢橋祥一
Oral presentation, Japanese, 2004信学通信ソ大
2004

歪成分の周波数依存性を補償するディジタルプリディストータの制御方法
水田信治; 鈴木恭宜; 広田哲夫; 山尾泰; 楢橋祥一
Oral presentation, Japanese, 2004信学通信ソ大
2004

From 3G to 4G, - Technical Challenges for Systems Beyond IMT-2000
Y. Yamao
Invited oral presentation, English, RFIC Symposium 2003, Workshop on Beyond 3G, Invited, IEEE, International conference
2003

オペレータのＲ＆Ｄ部門の１技術者から見た新世代移動通信とソフトウェア無線技術
山尾泰
Oral presentation, Japanese, 信学技報
2003

2003年IEEE MTT-S国際マイクロ波シンポジウム出席報告
高木直; 西野有; 廣瀬達哉; 山尾泰; 吉増敏彦; 丸橋健一; 平岡隆晴; 黒木太司
Oral presentation, Japanese, 信学技報
2003

歪周波数特性補償型ディジタルプリディストータの歪補償効果
水田信治; 鈴木恭宜; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2003信学通信ソ大
2003

歪周波数特性補償型ディジタルプリディストータによるドハティ増幅器の線形化
鈴木恭宜; 水田信治; 広田哲夫; 山尾泰
Oral presentation, Japanese, 2003信学通信ソ大
2003

電流密度低減可能なコプレーナ形線路構造
佐藤圭; 小泉大輔; 楢橋祥一; 山尾泰
Oral presentation, Japanese, 2003信学通信ソ大
2003

Activities of the mITF Fourth Generation Mobile Communications Committee
Y. Yamao
Invited oral presentation, English, ICFS2002, Invited, IEICE, Tokyo, International conference
2002

Technical Impact of New Generation Mobile Communications System
Y. Yamao
Invited oral presentation, English, International Forum on 4th Generation Mobile Communications 2002, International Forum on 4th Generation Mobile Communications 2002, International conference
2002

Activities in Mobile IT Forum (mITF) on 4G Systems Study
Y. Yamao
Invited oral presentation, English, PIMRC2002, panel session on 4G, Invited, IEEE, Lisbon, International conference
2002

Technical Impact of Fourth Generation Mobile Communications System
Y. Yamao
Invited oral presentation, English, VTC2002-Fall,C, Workshop on Systems beyond 3G, Invited, IEEE, Vancouver,Canada, International conference
2002

CDMAセルラパケット伝送方式へのマルチホップ接続適用によるエリアカバレッジ拡大効果
竹田真二; 藤原淳; 吉野仁; 大津徹; 山尾泰
Oral presentation, Japanese, 信学技報
2002

CDMAセルラパケット伝送方式へのマルチホップ接続適用による容量増大効果
藤原淳; 竹田真二; 吉野仁; 大津徹; 山尾泰
Oral presentation, Japanese, 信学技報
2002

移動局間中継導入によるDS-CDMAセルラシステムの容量および送信電力に関する検討
山本高至; 村田英一; 吉田進; 藤原淳; 大津徹; 山尾泰
Oral presentation, Japanese, 信学技報
2002

New Generation Mobile Communication System Beyond IMT-2000
Y. Yamao
Invited oral presentation, English, 3G Wireless 2001 San Francisco, Invited, IEEE 3G Wireless 2001 San Francisco, San Francisco, International conference
2001

移動するネットワークをサポートするためのMobile IPv6の拡張
岡島一郎; 池田武弘; 梅田成視; 山尾泰
Oral presentation, Japanese, 信学技報
2001

IPベース移動通信システムにおける仮想基地局構成法に関する検討
池田武弘; 岡島一郎; 梅田成視; 山尾泰
Oral presentation, Japanese, 信学技報
2001

QoS無線リソース割当のマルチメディアトラヒック環境での特性評価
陳嵐; 梅田成視; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

IPベース移動通信システムにおける仮想基地局構成法
池田武弘; 岡島一郎; 梅田成視; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

ワイヤレスマルチホップネットワークにおける干渉量の評価
油川雄司; 大津徹; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

ワイヤレスマルチホップネットワークにおける回線容量設計法の提案
藤部秀樹; 油川雄司; 大津徹; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

基地局配置状況に基づいた自律セル形成法の提案
藤部秀樹; 佐藤嬉珍; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

DS-CDMAセルラ上り回線における中継導入に関する基礎検討
山本高至; 村田英一; 吉田進; 藤原淳; 大津徹; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

光ファイバ/空間ハイブリッド光伝送による無線アクセスネットワーク構成法
油川雄司; 大津徹; 山尾泰
Oral presentation, Japanese, 2001信学総大
2001

Vision 2010 - Mobile Communications System beyond IMT-2000
Y. Yamao
Invited oral presentation, English, IST2000 Nice, Invited, EC, Nice, International conference
2000

Fourth Generation Mobile Communications System. –Issues towards 2010’s
Y. Yamao
Public symposium, English, 6th Wireless Communications Workshop, 6th Wireless Communications Workshop
2000

Overview of Fourth Generation Mobile Communications System
Y. Yamao
Public symposium, English, MWE2000 Workshop Digest, IEICE
2000

パケット移動無線伝送における送信電力･タイミング制御法
川合裕之; 大久保信三; 須田博人; 山尾泰
Oral presentation, Japanese, 信学技報
2000

誤り検出時軟判定情報伝送サイトダイバーシチ
藤原淳; 大久保信三; 須田博人; 山尾泰
Oral presentation, Japanese, 信学技報
2000

QoSを考慮した自律分散型パケットアクセスセルラーシステムにおける無線リソース割当
陳嵐; 梅田成視; 山尾泰
Oral presentation, Japanese, 信学技報
2000

次世代移動通信へのターボ符号の適用
須田博人; 渋谷彰; 藤原淳; 山尾泰
Oral presentation, Japanese, 2000信学基礎境界ソ大
2000

MARTINI/CDMA通信方式におけるサイトダイバーシチ受信の効果
大久保信三; 嶋田功伯留都; 川向紀昭; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 2000信学総大
2000

MARTINI/CDMA通信方式におけるセクタ合成受信の効果
嶋田功伯留都; 大久保信三; 川向紀昭; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 2000信学総大
2000

パケット移動無線伝送における送信タイミング制御法
嶋田功伯留都; 大久保信三; 川向紀昭; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 2000信学総大
2000

移動パケット通信の下り回線干渉低減を目指す送信電力･ウィンドウ同時制御法の提案
川合裕之; 大久保信三; 大津徹; 山尾泰
Oral presentation, Japanese, 2000信学通信ソ大
2000

第４世代移動通信の課題
山尾泰
Oral presentation, Japanese, 信学会第１２回情報伝送と信号処理ワークショップ
1999

素数インタリーバを用いたTurbo符号のW-CDMAへの適用効果
渋谷彰; 須田博人; 山尾泰
Oral presentation, Japanese, 信学技報
1999

時間拡散M-ary符号変復調を用いたCDMA通信方式
大久保信三; 嶋田功伯留都; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 1999信学総大
1999

時間拡散M-ary符号変復調/CDMA通信方式の野外実験結果
大久保信三; 嶋田功伯留都; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 1999信学総大
1999

低速ディジタル信号伝送に適した時間拡散M-ary符号変復調方式(MARTINI)
山尾泰; 大久保信三; 嶋田功伯留都; 伊藤正悟
Oral presentation, Japanese, 1998信学総全大
1998

時間拡散M-ary符号変復調方式(MARTINI)におけるフェージング誤り改善効果
大久保信三; 伊藤正悟; 嶋田功伯留都; 山尾泰
Oral presentation, Japanese, 1998信学総大
1998

280MHz帯複局同時送信システムにおける屋内電界強度の検討
大橋節也; 伊藤正悟; 山尾泰; 藤井輝也
Oral presentation, Japanese, 1998信学ソ大
1998

4FSK信号複局同時送信による遅延干渉に対する時間ダイバーシチの適用効果
大久保信三; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 1997信学ソ大
1997

高度無線呼出システム（FLEX-TD）の概要と技術展望
山尾泰
Oral presentation, Japanese, 信学技報
1996

高度無線呼出システム（FLEX-TD）における時間ダイバーシチの効果
大久保信三; 伊藤正悟; 坂井勉; 山尾泰
Oral presentation, Japanese, 信学技報
1996

高度無線呼出システム（FLEX-TD）の構成と特徴
山尾泰; 伊藤正悟; 横田博道
Oral presentation, Japanese, 1996信学ソ大
1996

無線呼出システムにおける時間ダイバーシチによる呼出率改善効果
伊藤正悟; 大久保信三; 山尾泰
Oral presentation, Japanese, 1995信学ソ大
1995

時間ダイバーシチ受信に適したフレーム構成
伊藤正悟; 山尾泰
Oral presentation, Japanese, 1995信学ソ大
1995

GPSを用いた移動通信基地局間位相同期法
西川信広; 伊藤正悟; 山尾泰
Oral presentation, Japanese, 1995信学ソ大
1995

ディジタル移動通信方式用携帯機の設計構想
山尾泰; 冨里繁; 室田和昭
Oral presentation, Japanese, 1991信学春季全大
1991

線形予測アンテナ選択合成ダイバーシチ受信法の提案
山尾泰; 長尾嘉則
Oral presentation, Japanese, 1991信学春季全大
1991

検波位相尤度を用いたQPSK回線品質測定
山本治夫; 鷹見忠雄; 斉藤茂樹; 山尾泰
Oral presentation, Japanese, 1991信学春季全大
1991

リミタ増幅器を用いた低消費電力線形受信機
山口彰; 山尾泰
Oral presentation, Japanese, 1991信学春季全大
1991

位相差ディジタルホールド形PLLを用いた高速シンセサイザ
垂沢芳明; 山尾泰
Oral presentation, Japanese, 1991信学秋季全大
1991

TDMA移動通信におけるアンテナ予測選択ダイバーシチの適用効果
長尾嘉則; 清水巧; 山尾泰
Oral presentation, Japanese, 1991信学秋季全大
1991

π/４QPSK移動無線伝送における変調誤差の影響
鷹見忠雄; 清水巧; 山尾泰
Oral presentation, Japanese, 1991信学秋季全大
1991

ディジタル移動機送信系における変調精度の検討
冨里繁; 千葉耕司; 山尾泰
Oral presentation, Japanese, 1991信学秋季全大
1991

全ディジタル化ACT同期検波回路
斉藤茂樹; 山本治夫; 山尾泰
Oral presentation, Japanese, 信学技報
1990

ディジタル・ループプリセット形高速周波数シンセサイザ
垂沢芳明; 山尾泰; 斉藤茂樹
Oral presentation, Japanese, 信学技報
1990

QPSK移動無線通信における近似ナイキスト伝送の検討
鷹見忠雄; 斉藤茂樹; 冨里繁; 山尾泰
Oral presentation, Japanese, 信学技報
1990

800MHz帯GaAsモノリシック直交変調器
山尾泰
Oral presentation, Japanese, 1990信学春季全大
1990

QPSK移動無線伝送におけるフィルタ系歪の影響
鷹見忠雄; 斉藤茂樹; 冨里繁; 山尾泰
Oral presentation, Japanese, 1990信学春季全大
1990

直接位相量子化（DPQ）を用いた全ディジタルQPSK同期検波回路
斉藤茂樹; 山本治夫; 山尾泰
Oral presentation, Japanese, 1990信学春季全大
1990

TDMA移動通信の室内伝送実験
大野公士; 広池彰; 斉藤茂樹; 山本治夫; 山尾泰
Oral presentation, Japanese, 1990信学秋季全大
1990

ディジタル移動通信におけるコーディング情報利用形VOX制御
小林勝美; 山尾泰; 上林真司
Oral presentation, Japanese, 1990信学秋季全大
1990

高速切換周波数シンセサイザ用ファジイ推論制御電圧設定法
垂沢芳明; 山尾泰
Oral presentation, Japanese, 1990信学秋季全大
1990

ディジタル移動通信用線形飽和増幅器のバースト送信特性
冨里繁; 千葉耕司; 山尾泰
Oral presentation, Japanese, 1990信学秋季全大
1990

QPSK移動無線伝送系の検討
山尾泰; 斉藤茂樹; 鷹見忠雄; 山本治夫
Oral presentation, Japanese, 信学技報
1989

低消費電力モノリシック直交変調器
山尾泰; 斉藤茂樹
Oral presentation, Japanese, 1989信学春季全大
1989

ディジタル・ループプリセット形高速周波数シンセサイザ
垂沢芳明; 斉藤茂樹; 山尾泰
Oral presentation, Japanese, 1989信学春季全大
1989

位相尤度比較（PLC）選択合成ダイバーシチ
斉藤茂樹; 山尾泰
Oral presentation, Japanese, 1989信学秋季全大
1989

DLP高速周波数シンセサイザ
垂沢芳明; 山尾泰
Oral presentation, Japanese, 1989信学秋季全大
1989

分割パルスカウントＦＭ復調器 －MPC-FM復調器－
佐和橋衛; 卜部 周二; 室田和昭; 山尾泰
Oral presentation, Japanese, 信学技報
1987

ディジタルIC化に適したFM復調器の一構成法
山尾泰; 佐和橋衛
Oral presentation, Japanese, 昭61信学総全大
1986

DSPを用いた直交形ディジタル・アナログ共用ＦＭ変調器の設計
山尾泰
Oral presentation, Japanese, 信学技報
1985

SCFを共用化した移動機ベースバンド回路の構成法
山尾泰
Oral presentation, Japanese, 信学技報
1985

DSPを用いた直交形ディジタル・アナログ共用変調器
山尾泰
Oral presentation, Japanese, 昭60信学総全大
1985

GaAs 広帯域モノリシックスイッチ
山尾泰; 菅田孝之
Oral presentation, Japanese, 信学技報
1984

引込特性を改善したMSK同期検波IC
山尾泰; 鈴木博; 門馬宏二
Oral presentation, Japanese, 昭59信学通信全大
1984

GaAs 広帯域モノリシックスイッチの特性
山尾泰; 菅田孝之
Oral presentation, Japanese, GaAs 広帯域モノリシックスイッチの特性
1984

GMSK直交形変調器に用いるベースバンド波形生成LSIの特性
鈴木博; 山尾泰; 門馬宏二
Oral presentation, Japanese, 昭59信学通信全大
1984

送信周波数制御AFCによるディジタル信号伝送特性の改善
山尾泰; 鈴木博
Oral presentation, Japanese, 信学技報
1983

低消費電力RC帰還形GaAsモノリシック増幅器の特性
田島淳; 山尾泰; 菅田孝之; 平山昌宏
Oral presentation, Japanese, 信学技報
1983

広帯域GaAsモノリシックスイッチ
山尾泰; 菅田孝之
Oral presentation, Japanese, 昭58信学総全大
1983

GaAs FET ダブルバランスミキサを用いた直交形変調器
山尾泰; 鈴木博
Oral presentation, Japanese, 信学技報
1982

MSK同期検波用１チップCMOS-IC
鈴木博; 山尾泰; 菊池博行
Oral presentation, Japanese, 信学技報
1982

送信周波数オフセットを用いた周波数ドリフト抑制法
山尾泰; 鈴木博
Oral presentation, Japanese, 昭57信学総全大
1982

ディジタル型同期検波器の引込特性改善法
山尾泰; 鈴木博
Oral presentation, Japanese, 昭57信学通信全大
1982

ディジタル化直交形変調器の高速化に関する検討
山尾泰; 鈴木博
Oral presentation, Japanese, 昭56信学総全大
1981

FM用直交形変調器のディジタル化に関する検討
鈴木博; 山尾泰
Oral presentation, Japanese, 信学技報
1980

ディジタル化GMSK変調器の実験的検討
山尾泰; 鈴木博
Oral presentation, Japanese, 昭55信学通信全大
1980

GMSK変調器の構成法に関する一検討
鈴木博; 山尾泰
Oral presentation, Japanese, 昭55信学総全大
1980

ディジタル化GMSK変調器設計法の検討
鈴木博; 山尾泰
Oral presentation, Japanese, 昭55信学通信全大
1980

Advanced Integrated Circuit Design
The University of Electro-Communications

集積回路設計特論
電気通信大学

Circuit and System II
The University of Electro-Communications

回路システム学第２
電気通信大学

IEICE

IEEE

Information Processing Society of Japan

無線呼出システム
Patent right, 伊藤正悟, 山尾泰, -, 3527253, Date issued: 27 Feb. 2004

無線呼出方式並び無線呼出方式における中央局、基地局及び無線呼出端末
Patent right, 伊藤正悟, 山尾泰, 大橋節也, -, 3492914, Date issued: 14 Nov. 2003

移動無線パケット通信システムにおける移動端末機の位置管理方法及びその移動無線パケット通信システム
Patent right, 篠崎卓也, 梅田成視, 山尾泰, -, 3450776, Date issued: 11 Jul. 2003

無線呼出方式
Patent right, 伊藤正悟, 水木貴教, 山尾泰, -, 3400252, Date issued: 21 Feb. 2003

無線呼出方式
Patent right, 伊藤正悟, 山尾泰, 水木貴教, -, 3327507, Date issued: 12 Jul. 2002

無線呼出符合化制御装置
Patent right, 水木貴教, 大橋節也, 山尾泰, 伊藤正悟, -, 3305644, Date issued: 10 May 2002

移動無線方式および移動受信機
Patent right, 伊藤正悟, 山尾泰, -, 3108567, Date issued: 08 Sep. 2000

出力可変送信装置
Patent right, 冨里繁, 山尾泰, 千葉耕司, -, 3044057, Date issued: 10 Mar. 2000

時間ダイバーシティ通信方式
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 3044064, Date issued: 10 Mar. 2000

移動無線通信方式および無線選択呼出受信機
Patent right, 藤沢一郎, 西尾英昭, 山尾泰, -, 2981104, Date issued: 17 Sep. 1999

ディジタル包絡線生成装置
Patent right, 冨里繁, 山尾泰, -, 2926657, Date issued: 14 May 1999

移動通信方式および無線受信機
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 2913071, Date issued: 16 Apr. 1999

無線選択呼出方式および移動通信方式
Patent right, 伊藤正悟, 山尾泰, -, 2899768, Date issued: 19 Mar. 1999

無線呼出用受信機
Patent right, 村田善利, 山尾泰, -, 2896733, Date issued: 12 Mar. 1999

受信機
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 2869582, Date issued: 08 Jan. 1999

周波数シンセサイザ
Patent right, 垂澤芳明, 山尾泰, -, 2863531, Date issued: 10 Dec. 1998

９０度移相器
Patent right, 山尾泰, -, 2516250, Date issued: 30 Apr. 1996

高精度二重平衡変調器
Patent right, 山尾泰, 鈴木博, -, Date applied: 1977, 1486629

アンテナ選択ダイバーシチ受信方式
Patent right, 山尾泰, -, 米国5203024 カナダ2041283-6 欧州EPC0454585

移動局の無線通信機
Patent right, 山尾泰, 垂澤芳明, 野島俊雄, -, 米国5231632号、欧州EPC0430106号、カナダ2030641号

無線通信用ディジタル変復調方式
Patent right, 山尾泰, 伊藤正悟, 大久保信三, 嶋田功伯留都, 安達文幸, -, 米国6351498号、中国1219058号、欧州EPC0918409号

クラスタ構造形移動通信システム、基地局、クラスタ統括局、回線制御局及び移動局
Patent right, 山尾泰, 須田博人, 梅田成視, -, オーストラリア746567号、韓国367197号、シンガポール97897号、カナダCA2315316号、欧州EPC1073297

中継端末、基地局、課金サーバ、通信システム、課金方法、プログラム、コンピュータデータ信号及び記録媒体
Patent right, 山尾泰, 佐藤嬉珍, -, シンガポール200303269-5号

周波数シンセサイザ
Patent right, 垂澤芳明, 山尾泰, 斉藤茂樹, 野島俊雄, -, 米国4980652号、カナダ1325251号、欧州EPC0360442号

ダイバーシチ受信回路
Patent right, 斉藤茂樹, 山尾泰, -, 米国5203023号、欧州EPC0419674号、韓国101643号、カナダ2029876号

線形送信装置
Patent right, 千葉耕司, 野島俊雄, 山尾泰, 冨里繁, 鷹見忠雄, -, 米国5251330号、カナダ2035455号

無線選択呼出方式および移動通信方式
Patent right, 伊藤正悟, 山尾泰, -, 米国5722065号、中国ZL94190635.3号

移動通信方式
Patent right, 伊藤正悟, 山尾泰, -, 米国5805076号、韓国330522号、中国ZL9419080.9号

移動通信方式および無線受信機
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 米国5826172号、中国ZL95190059.5号

移動無線通信方式および無線選択呼出受信機
Patent right, 藤沢一郎, 西尾英昭, 山尾泰, -, 中国ZL95190137.0号

時間ダイバーシチ受信方式
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 米国5794124号

受信機
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 米国5760702号、中国ZL95190532.5号

無線呼出方式
Patent right, 伊藤正悟, 水木貴教, 山尾泰, -, 米国6301230号、中国ZL97190794.3号

無線呼出方式
Patent right, 伊藤正悟, 山尾泰, 大久保信三, -, 米国6356579号、カナダ2253341号

無線呼出符号化制御装置
Patent right, 水木貴教, 大橋節也, 山尾泰, 伊藤正悟, -, 米国6512748号

移動通信におけるスロット割当て方法及びその方法を使用する基地局及び移動局
Patent right, 陳嵐, 梅田成視, 山尾泰, -, 中国ZL00135991.6号

移動通信制御方法及びそのシステム及びそれらに用いられる基地局及び移動局
Patent right, 梅田成視, 山尾泰, 陳嵐, -, 韓国389480号

移動通信システム
Patent right, 岡島一郎, 梅田成視, 鈴木芳文, 山尾泰, -, 欧州EPC1113681号

移動無線パケット通信システムにおける移動端末機の位置管理方法及びその移動無線パケット通信システム
Patent right, 篠崎卓也, 梅田成視, 山尾泰, -, 欧州EPC1113691号、韓国389479号

無線基地局システム、統括局及び該統括局における信号処理方法
Patent right, 油川雄司, 須田博人, 山尾泰, -, 韓国382291号

マルチキャストサービス提供システムにおける再送制御方法、情報配信装置及び無線端末
Patent right, 佐藤嬉珍, 嶋田功伯留都, 梅田成視, 山尾泰, -, 中国ZL01116602.9号

マルチキャストサービス提供方法ならびに情報配信装置及び無線端末
Patent right, 佐藤嬉珍, 梅田成視, 山尾泰, -, 韓国404519号、中国ZL01117906.6号、オーストラリア769231号

複数ネットワーク接続型通信システムの基地局およびその接続方法
Patent right, 佐藤嬉珍, 梅田成視, 山尾泰, -, オーストラリア766161号

移動通信用基地局ネットワーク及び前記ネットワークにおける基地局切換え方法
Patent right, 油川雄司, 吉野仁, 大津徹, 山尾泰, -, 中国ZL01801204.3号