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TAKYU Osamu

Academic OrganizationAcademic Assembly School of Science and Technology Institute of EngineeringTEL
Education and Research OrganizationFaculty of Engineering Electrical and Computer EngineeringFAX
PositionAssociate ProfessorMail Address
Address4-17-1, Wakasato, Nagano City 380-8553Web site

Modified:09/22/2017

Profile

Research Field
Communication/Network engineering
Current Subject
Research and Development of Intelligent MAC Protocol for Cognitive Radio
Keywords:Cognitive Radio , MAC Protocol , Intelligent , 2009-2011 , Study of Intelligent MAC Protocol for Scandalizing Cognitive Radio
Experimental Study of Identification Method of Parallel Transmitted Symbols for MIMO and Cognitive Radio System
Keywords:Cognitive Radio , MIMO , 2008-2011 , Study of Identification Method of Parallel Transmitted Symbols for MIMO and Cognitive Radio System
Identification of Parallel Trasnsmitted Symbols
Keywords:Cognitive Radio , MIMO , 2008-2011
Academic Societies
Academic Societies
The Institute of Electrical and Electronics Engineers
The Institute of Ellectronics, Information and Coommunication Engineers

Committee of Academic Societies
2013- , Technical Committee on Smart Radio, The Institute of Ellectronics, Information and Coommunication Engineers , Secretary
2013- , Shinetu Section, The Institute of Ellectronics, Information and Coommunication Engineers , Member
2010- , Communication Society, The Institute of Electrical and Electronics Engineers , International Conference on ICC, TPC Member
2008- , Journal of Society, The Institute of Ellectronics, Information and Coommunication Engineers , Regular Reviewer
2008- , Communication Society, The Institute of Electrical and Electronics Engineers , International Conference on Globcom, TPC Member
2014-2015 , Communication Society, The Institute of Electrical and Electronics Engineers , Publicity Chair
2010-2013 , Technical Committee on Softwear Radio, The Institute of Ellectronics, Information and Coommunication Engineers , Assistant
2009-2010 , Technical Committee on Softwear Radio, The Institute of Ellectronics, Information and Coommunication Engineers , Expert Member
Academic Background
Graduate School
Keio University , (Open and Environmental Systems , Science and Technology) , 2006
Keio University , (Open and Environmental Systems , Science and Technology) , 2003

College
Tokyo University of Science , (Science and Technology) , 2002

Degree
Phylosopy of Doctor (Engineering) , Keio University
Awards
2017
2013
2011
2011
2010
2009
2003 , Young Researcher's Encouragement Award
Research Career
Research Career
2014- , Associate Prof. Faculty of Engineering, Shinshu Unin.
2013-2014 , Associate Prof. Faculty of Technology, Shinshu Univ.
2011-2013 , Assistant Prof. Faculty of Technology, Shinshu Univ.
2007-2011
2006-2007

Overseas Education
2004-2005 , Visiting Scholar, University of Sydney, Australia

Research

Books, Articles, etc.
Articles
Fusion Center Controlled MAC Protocol for Physical Wireless Parameter Conversion Sensor Networks (PHY-C SN)
IEICE TRANSACTIONS ON COMMUNICATIONS,E100B(7):1105-1114 2017(Jul.)
Author:Kakinuma, Koji; Ohta, Mai; Takyu, Osamu; Fujii, Takeo;


A threshold decision method for MRC in QAM constellation rearrangement
IEICE Communications Express,5(7):236-241 2016
Author:Sasamori Fumihito; Sakamoto Naoki; Takyu Osamu; Handa Shiro;
Keywords:constellation rearrangement; threshold decision; maximal-ratio combining; repetition coding; OFDM;


Optimization of Learning Time for Learning-assisted Rendezvous Channel in Cognitive Radio System
IEICE Transaction on Communications,E98-B(2):pp.360-369 2015(Feb. 01)
Author:O. Takyu, T. Yamakita, T. Fujii, M. Ohta, F. Sasamori, S. Handa


Joint Resource Allocation with Interference Constraint for Cognitive Multi-Hop Wireless Networks
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES,E98A(2):569-577 2015(Feb.)
Author:Kako, Shuta; Takyu, Osamu; Fujii, Takeo;


Precise BER Analysis of Repetition Coded OFDM Systems over Time- and Frequency-selective Rayleigh Fading Channels
IEICE Transaction on Communications,E98-B(1):pp.88-98 2015(Jan. 01)
Author:F. Sasamori, S. Asada, O. Takyu, S. Handa


Data Tracking and Effect of Frequency Offset to Simultaneous Collecting Method for Wireless Sensor Networks
INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS,:- 2015
Author:Myoenzono, Ryo; Takyu, Osamu; Shirai, Keiichiro; Fujii, Takeo; Ohta, Mai; Sasamori, Fumihito; Handa, Shiro;


Resource Block Assignment to Reduce Peak to Average Power Ratio in Multi-User OFDM
IEICE Transaction on Communications,E97-B(8):pp.1689-1700 2014(Aug.)
Author:O.Takyu, Y. Umeda, F. Sasamori, S. Handa,


コグニティブ無線システムのための時間変化に追従可能な高精度占有率測定法
映像メディア学会誌,68(5):pp.J213-216 2014(May)
Author:若尾 悠太,田久 修,藤井 威生,笹森 文仁,半田 志郎


Dynamic Spectrum Sharing for OFDMA-Based Multi-hop Cognitive Radio Networks with Priority
WIRELESS PERSONAL COMMUNICATIONS,74(3):1081-1097 2014(Feb.)
Author:Kako, Shuta; Fujii, Takeo; Takyu, Osamu


A High-Speed LED Driver That Sweeps Out the Remaining Carriers for Visible Light Communications
JOURNAL OF LIGHTWAVE TECHNOLOGY,32(2):239-249 2014(Jan. 15)
Author:Kishi, Toshiki; Tanaka, Hiroyuki; Umeda, Yohtaro; Takyu, Osamu


スロットベースのランダムアクセス型プライマリシステムと周波数共有するセカンダリシステムのキャリアセンス制御と干渉マージンの設計
和文論文誌B,J96-B(7):pp.729-741 2013(Jul.)
Author:堀江駿太,田久 修,藤井威生,楳田洋太郎


Adaptive Iterative Decoding of Finite-Length Differentially Encoded LDPC Coded Systems with Multiple-Symbol Differential Detection
IEICE TRANSACTIONS ON COMMUNICATIONS,E96B(3):847-858 2013(Mar.)
Author:Yu, Yang; Handa, Shiro; Sasamori, Fumihito; Takyu, Osamu


TCP性能向上のためのマルチホップコグニティブネットワーク向けMACプロトコルの提案
和文論文誌B,J96-B(3):pp.356-365 2013(Mar.)
Author:木村 孝政, 藤井 威生,田久 修


CDMA変調された信号に対する変調方式識別法
和文論文誌B,J95-B(2):pp.309-316 2012(Feb. 01)
Author:杉本 成正 田久 修 楳田 洋太郎


An Autonomous Selective Cooperative ARQ Protocol for Hybrid Mobile Wireless Sensor Networks
Journal of Communications,6(2):pp.157-167 2011(Apr.)
Author:N. LYNN, O. TAKYU, K. ADACHI, T. OHTSUKI, M. NAKAGAWA


MAC Layer Importance for Multimedia Services in Future Cognitive Radio World
IEEE COMSOC MMTC E-Letter,6(3):pp.54-57 2011(Mar.)
Author:T. Fujii and O. Takyu


Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES,E93A(12):2672-2681 2010(Dec.)
Author:Yamasaki, Takeo; Takyu, Osamu; Adachi, Koichi; Umeda, Yohtaro; Nakagawa, Masao


Frequency Rotation for Suppressing Multipath Interference and Achieving Large Frequency Diversity in Uplink IFDMA
IEICE TRANSACTIONS ON COMMUNICATIONS,E93B(5):1284-1288 2010(May)
Author:Takyu, Osamu; Umeda, Yohtaro; Nakagawa, Masao


Scattered Pilot Assisted Channel Estimation for IFDMA Uplink
IEICE TRANSACTIONS ON COMMUNICATIONS,E92B(12):3803-3814 2009(Dec.)
Author:Yamasaki, Takeo; Takyu, Osamu; Umeda, Yohtaro


Frequency spectrum rotation in Interleaved Frequency Division Multiplexing
IEICE TRANSACTIONS ON COMMUNICATIONS,E91B(7):2357-2365 2008(Jul.)
Author:Takyu, Osamu; Nakagawa, Masao


Relay method of sending soft decision symbol based on the result of error detecting code in cooperative communication
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES,E90A(11):2404-2412 2007(Nov.)
Author:Fukuyama, Yuki; Takyu, Osamu; Adachi, Koichi; Nakagawa, Masao


Evaluation of asymmetric TDD systems employing AMC and HARQ by considering MCS selection errors
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES,E89A(11):3138-3147 2006(Nov.)
Author:Lynn, Nandar; Takyu, Osamu; Esmailzadeh, Riaz; Nakagawa, Masao


Companding system based on time clustering for reducing peak power of OFDM symbol in wireless communications
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES,E89A(7):1884-1891 2006(Jul.)
Author:Takyu, Osamu; Ohtsuki, Tomoaki; Nakagawa, Masao


A sign selection method of orthogonal variable spreading factor code for peak power reduction in multi-rate OFCDM systems
IEICE TRANSACTIONS ON COMMUNICATIONS,E89B(4):1333-1345 2006(Apr.)
Author:Takyu, O; Ohtsuki, T; Nakagawa, M;


Criterion for reducing error rate degradation by nonlinear amplifier for multicarrier transmission
IEICE TRANSACTIONS ON COMMUNICATIONS,E88B(7):3057-3061 2005(Jul.)
Author:Takyu, O; Ohtsuki, T; Nakagawa, M;


Frequency offset compensation with MMSE-MUD for multi-carrier CDMA in quasi-synchronous uplink
IEICE TRANSACTIONS ON COMMUNICATIONS,E87B(6):1495-1504 2004(Jun.)
Author:Takyu, O; Ohtsuki, T; Nakagawa, M;


Presentations
Data Tracking Using Frequency Offset and SIC for Physical Wireless Conversion Sensor Networks
IEEE Wireless Communications and Networking Conference Workshops (WCNCW) , :6 pages 2017(Mar.)
Author:T. Sakai, O. Takyu, K. Shirai, M. Ohta, T. Fujii, F. Sasamori, S. Handa


Measurement Technique for Occupancy Ratio and Transition Ratio in Cognitive Radio System
IEEE Wireless Communications and Networking Conference Workshops (WCNCW) , :6 pages 2017(Mar.)
Author:H. Soya, O. Takyu, K. Shirai, M. Ohta, T. Fujii, F. Sasamori, S. Handa


Optimization of multi-channel access in learning assisted measurement of channel occupancy ratio by USRP
ICOIN2017 , :92-96 2017(Jan.)
Author:Takumi Kimura, Osamu Takyu, Fumihito Sasamori, Shiro Handa, Takeo Fujii, Mai Ohta


Optimal cluster head selection and rotation of cognitive wireless sensor networks for simultaneous data gathering
ICOIN2017 , :303-308 2017(Jan.)
Author:Shohei Fujii, Osamu. Takyu, Fumihito Sasamori, Shiro Handa, Takeo Fujii , Mai Ohta,


Fundamental Study of Decomposition based on Heterogeneous Sensing Data in Physical Conversion Sensor Networks
APSIPA ASC 2016 , :4pages 2016(Dec.)
Author:Minato Oriuchi, Osamu Takyu, Keiichiro Shirai, Takeo Fujii, Mai Ohta, Fumihito Sasamori, Shiro Handa


Optimal impersonation of CSI for maximizing leaked information to untrusted relay in PLNC
IEEE Wireless Communications and Networking Conference Workshops (WCNCW) , :5 pages 2016(Apr.)
Author:O.Takyu, K. Matsumoto, T. Ohtsuki, T. Fujii, F. Sasamori, S. Handa


Performance Evaluation of Multi-Target Tracking for PhyC-SN
IEEE Wireless Communications and Networking Conference Workshops (WCNCW) , :4 pages 2016(Apr.)
Author:M. Oriuchi, O. Takyu, K. Shirai, T. Fujii, M. Ohta, F. Sasamori, S. Handa


Multi-Target Tracking based on Features of Sensing Results and Wireless Parameters for Physical Wireless Parameter Conversion Sensor Networks
IEEE , RWS2016 , :3pages 2016(Jan.)
Author:M. Oriuchi, O. Takyu, K. Shirai, T. Fujii, M. Ohta, F. Sasamori, S. Handa


Performance Evaluation of the Physical Layer Security Using Artificial Noise and Relay Station
APSIPA ASC 2015 , :5pages 2015(Dec.)
Author:J. Kabeya, O. Takyu, T. Ohtsuki, F. Sasamori, S. Handa


Unifying of Frequency Channel for Spectrum Sharing in Wireless Sensor Networks with Star Topology
ICTC2015 , :5pages 2015(Oct.)
Author:T. Kimura, O. Takyu, F. Sasamori, S. Handa


Selection Method of Cluster Head in Wireless Sensor Networks of Wireless Physical Conversion for Spectrum Sharing
ICTC2015 , :5pages 2015(Oct.)
Author:S. Fujii, O. Takyu, T. Fujii, M. Ohta, F. Sasamori, S. Handa


High speed and small signaling overhead rendezvous in cognitive radio system
APWCS 2015 , :5pages 2015(Aug.)
Author:T. Yoneda, O. Takyu, T. Fujii, M. Ohta, F. Sasamori, S. Handa


Sleep control for maintaining large user throughput in cellular system
APWCS 2015 , :5pages 2015(Aug.)
Author:K. Shimohata, O. Takyu, F. Sasamori, S. Handa


Evaluation of Information Leak by Ipersonated CSI in PLNC considering physical layersecurity
IEEE , RWS2015 , :3pages 2015(Jan.)
Author:K.Matsumoto, O. Takyu, T.Fujii, T.Ohtsuki, F.Sasamori, S.Handa,


Physical Layer Network Coding with Multiple Untrusted Relays for Physical Layer Security
APSIPA , APSIPA ASC , :5pages 2014(Dec.)
Author:K.Yamaguchi, O. Takyu, T.Fujii, T.Ohtsuki, F.Sasamori, S.Handa


Learning assisted rendezvous channel in cognitive radio system
IEEE , ICCS2014 , :5pages 2014(Nov.)
Author:O. Takyu, T.Yamakita, T.Fujii, F.Sasamori, S.Handa


Data Tracking and Effect of Frequency Offset to Simultaneous Collecting Method for Wireless Sensor Networks
IEEE , ICTC2014 , :5pages 2014(Sep.)
Author:R. Myoenzono, O. Takyu, K.Shirai, T.Fujii, M.Ohta, F.Sasamori, S.Handa


Effect of PAPR Reduction to BS Cooperation MIMO Systems under Multi-Cell Environment
IEEE , RWS2014 , :pp.127-129 2014(Jan.)
Author:R. Myoenzono, O. Takyu, F. Sasamori, S. Handa


Protocol Analysis of Signal Detection for Deriving Minimum Isolation Distance for Frequency Recycling under WLAN Systems
IEEE , RWS2014 , :pp.262-264 2014(Jan.)
Author:M. Goto,O. Takyu,T. Fujii,F. Sasamori,S. Handa


Analysis of Channel Usage Tendency from Indoor Measurement Results in Wireless LAN System
IEEE , APWCS2013 , :pp.411-414 2013(Aug.)
Author:M. Goto, O.Takyu, T. Fujii, F. Sasamori, S. Handa


High-Accurate and Time-Traceable Occupancy Ratio Measurement for Cognitive Radio System
IEEE , APWCS2013 , :pp.280-284 2013(Aug.)
Author:Y. Wakao, O. Takyu, T. Fujii, F. Sasamori, S. Handa


Physical Layer Network Coding with Multiple Untrusted Relays for Physical Layer Network Coding
IEEE , APWCS2013 , :pp.41-45 2013(Aug.)
Author:K. Yamaguchi, O. Takyu, T. Fujii, T. Ohtsuki, F. Sasamori, S. Handa


Secondary Node Cooperation with Enhancing Secure Capacity under Existence of Primary System
IEEE , APWCS2013 , :pp.36-40 2013(Aug.)
Author:K. Tsukada, T. Suzuki, T. Fujii, O. Takyu, T. Ohtsuki


Improvement in Specific Emitter Identification by Nonlinearity Control in Baseband
IEEE , APWCS2013 , :pp.31-35 2013(Aug.)
Author:S. Aoki, Y. Umeda, Y. Kozawa, O. Takyu,


Theoretical Analysis for Learning-Assisted Rendezvous Channel for Cognitive Radio
IEEE , CTW 2013 , :2 pages 2013(Jun.)
Author:T. Yamakita, O. Takyu, T. Fujii, F. Sasamori, S. Handa


Power-amplifier-inserted Transversal Filter for Application to Pulse-density-modulation Switching-mode Transmitters
IEEE ISCIT 2012 2012(Oct.)
Author:S. Fujioka, M. Kojima, H. Izumi, Y. Umeda, O. Takyu


Upper Bound Analysis of Throughput and PAPR in Multiuser OFDM Systems
Trisai2012 , :pp.1-5 2012(Sep.)
Author:O. Takyu


Improved Soft-OutputM-Algorithmfor Differential Encoded LDPC Coded Systems with Multiple-Symbol Differential Detection
IEEE PIMRC2012 , :pp.1-7 2012(Sep.)
Author:Y.Yu, S. Handa, F. Sasamori, O. Takyu


Theoretical Analysis of Resource Block Assignment based on PAPR in Two Base Station Cellular System
Workshop on Wireless Distributed Network Conjunction with IEEE PIMRC 2012 , :pp.1-5 2012(Sep.)
Author:O.Takyu, Y. Umeda, F. Sasamori, S. Handa,


Dynamic Spectrum Sharing for OFDMA-Based Multi-hop Cognitive Radio Networks with Priority
IEEE ICUFN2012 , :pp.1-5 2012(Jun.)
Author:S. Kako, T. Fujii, O. Takyu,


Double Stage and Combining Detection for Cyclo-stationary Feature
IEEERWS2012 , :pp.1-4 2012(Jan.)
Author:O.Takyu, Hiroyoshi Yano, Takeo Fujii and Tomoaki Ohtsuki


Optimal Subcarrier Assignment for Single Cell Multiuser OFDM System
IEEERWS2012 , :pp.1-4 2012(Jan.)
Author:O.Takyu, Y. Umeda


On Physical Layer Simulation Model for 6-Axis Sensor Assisted VLC Based Positioning System
IEEE Globecom 2011 , :pp.1-5 2011(Dec.)
Author:C. Sertthin, T. Ohtsuki, O.Takyu, T. Fujii, and Y. Umeda


Performance for MAC Level Channel Capacity in Cognitive Radio with Carrier Sense Multiple Access and TransmittingPower Control
IEEE VTC 2011 Fall , :pp.1-5 2011(Sep.)
Author:O.Takyu, T. Saiwai, T. Fujii, and Y. Umeda


Fundamental Study onAdaptive ACK Link Control for Downloading based on TCP Connection in Mobile Wireless Communication,
IEEE PIMRC 2011 , :pp.2364 - 2368 2011(Sep.)
Author:O.Takyu, Y. Seki, T.Yamasaki, Y. Umeda, X. Wang, S. Konishi, and T. Fujii,


A Nearest Transmitter Classification Method for VLC Based Positioning System
IEEE PIMRC 2011 , :pp.1259 - 1263 2011(Sep.)
Author:C. Sertthin, T. Ohtsuki, O.Takyu, T. Fujii, and Y. Umeda


An Intelligent Secondary MAC Protocol Using Shared Spectrum with IEEE802.11 Wireless LAN
The Third International Conference on Ubiquitous and Future Networks, June 2011 , :pp.358 - 362 2011(Jun.)
Author:T. Suzuki, T. Fujii, and O.Takyu


Measurement method and result for Frequency Spectrum Sharing in Cognitive Radio
ICST Crowncom 2011 , :pp.1-5 2011(Jun.)
Author:O. Takyu, S. Horie, M. Furuichi, T. Kimura et.al.


Low Complexity Cyclostationary Feature Detection Method to Compenstate Cyclostationarity-Degradation by Guard Interval Insertion
ICST Crowncom 2011 , :pp.51-55 2011(Jun.)
Author:H. Yano, O. TAKYU, T.Fujii and T. Ohtsuki,


Analysis of Read Range for UHF Passive RFID Tags in Close Proximity with Dynamic Impedance Measurement of Tag Ics
IEEE Radio Wireless Symposium(RWS) 2011 , :pp.110-113 2011(Jan.)
Author:H. Yojima, Y. Tanaka, Y. Umeda, O. Takyu, M.Nakayama,K.Kodama


Inspection of High-Speed LED Drive for VisibleLight Communication by Remains Carrier Drawing-Out
IEEE Radio Wireless Symposium(RWS) 2011 , :pp.295-298 2011(Jan.)
Author:H. Tanaka, Y. Umeda, O. Takyu


Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication
IEEE International Conference on Communication System (ICCS) , :pp.751-755 2010(Nov.)
Author:Takeo YAMASAKI, Osamu TAKYU, Koichi. ADACHI, Yohtaro UMEDA, Masao NAKAGAWA


Subcarrier Assignment for Achieving Tradeoff between Peak Power and Channel Capacity in Block Transmission of Multiuser OFDM
IEEE International Conference on Communication System (ICCS) , :pp.431-435 2010(Nov.)
Author:Osamu TAKYU, Yohtaro UMEDA,


Dynamic Impedance Measurement of UHF Passive RFID Tags for Sensitivity Estimation
ISCIT 2010 , :pp.344-349 2010(Oct.)
Author:Hiroyuki YOJIMA, Yu TANAKA, Yohtaro UMEDA, Osamu TAKYU, Machiko NAKAYAMA Kazunari KODAMA


A CSI Reduction Method of Block Cooperative Decoding System in OFDM Wireless Communication Scheme
IEEE PIMRC Workshop on WDN 2010 , :pp.461-466 2010(Sep.)
Author:Yi ZHOU, Osamu TAKYU, Yohtaro UMEDA,


Cooperative ARQ using Distributed Relay Selection and Inter-relay Opportunistic Listening
IEEE PIMRC Workshop on WDN 2010 , :pp.467-472 2010(Sep.)
Author:Nanda LYNN, Osamu TAKYU, Koichi. ADACHI, TomoakiOHTSUKI, Masao NAKAGAWA


Wideband, Fast, and Wide-Dynamic-Range Spectrum Sensing Using Dual-Stage Spectrum Detection
IEEE Radio Wireless Symposium(RWS) 2010 , :pp.284-287 2010(Jan.)
Author:H. Abe, Y. Umeda, O. Takyu, T. Fujii and M. Nakagawa


Avoidance method of interference betweenRFID systems including interference-zone change according to the distance between channels
IEEE Radio Wireless Symposium(RWS) 2010 , :pp.204-207 2010(Jan.)
Author:A. Uryu, Y. Umeda and O. Takyu


Peformance Evaluation of User Selection based on Average SNR in Base Station Cooperation Multi-User MIMO
IEEE Radio Wireless Symposium(RWS) 2010 , :pp.685-688 2010(Jan.)
Author:Y. Seki, O. Takyu and Y. Umeda


A Study of Cooperative Communication with Consideration of Power Loss Caused by Relay Abortion
IEEE International Symposium on Wireless Communication Systems(ISWCS)2009 , :pp.531-535 2009(Sep.)
Author:M. Suzuki, O. Takyu, Y. Umeda,


Selective cooperative relay system with ARQ exploiting inter-relay opportunistic listening
International Symposium on Wireless Personal Multimedia Communications (WPMC) , :pp.1-4 2009(Sep.)
Author:N. Lynn, O. Takyu, K. Adachi, M. Nakagawa


Scattered Pilot Assisted Channel Estimation for IFDMA
IEEE Wireless VITAE , :pp.832-836 2009(May)
Author:O.Takyu, T. Yamasaki, Y. Umeda


Change of Communication Distance for Close Passive UHFRFID Tags
IEEE RFID Conference , :pp.338-345 2009(Apr.)
Author:Y. Tanaka, Y. Umeda, O. Takyu, M. Nakayama, K. Kodama,


Detection Method for Recognizing Number of Parallel Transmitted Symbols in MIMO-Cognitive Wireless Communication
IEEE ISITA 2008 , :pp.1-6 2008(Dec.)
Author:O. Takyu, T. Fujii, Y. Umeda, and M. Nakagawa


Performance Evaluation of Effect of Nonlinear Distortion in SC-FDMA System
IEEE ISITA 2008 , :pp.1-5 2008(Dec.)
Author:N. Suzuki, O. Takyu, and Y. Umeda,


Effect of Channel Mismatch on AMC in Asymmetric TDD/OFDM System with Pre-equalization in Downlink
IEEE ISITA 2008 , :pp.1-5 2008(Dec.)
Author:N. Lynn, K. Adachi, O. Takyu, M. Nakagawa,


Frequency Rotation for Suppressing Path Interference and Achieving Large Frequency Diversity in Uplink IFDMA
IEEE PIMRC 2008 , :pp.1-5 2008(Sep.)
Author:O. Takyu, Y. Umeda, and M. Nakagawa


Performance evaluation of decision directed channel estimation for single user IFDMA
IEEE Radio and Wireless Symposium (RWS2008) , :pp.659-662 2008(Jan.)
Author:W. Li, O. Takyu, K. Adachi, and M. Nakagawa


Noise Reduction Scheme with Using Redundant GI in Uplink IFDMA
International Symposium on Wireless Personal Multimedia Communications (WPMC '07) , :pp.1-4 2007(Dec.)
Author:A. Yamasaki, O. Takyu, S. Kondo, and M. Nakagawa


Frequency Domain Pre and Post Equalization for High Diversity Gain in Cooperative Communication
International Symposium on Wireless Personal Multimedia Communications (WPMC '07) , :pp.1-4 2007(Dec.)
Author:M. Yamakoshi, O. Takyu, and M. Nakagawa


Frequency Spectrum Rotation in Interleaved Frequency Division Multiplexing
IEEE Global Telecommunications Conference (Globecom) 2007 , :pp.4543-4547 2007(Nov.)
Author:O. Takyu and M. Nakagawa


IFDM for Downlink Wireless Access Scheme and PerformanceComparison to MC-CDM
IEEE PIMRC 2007 , :pp.1-5 2007(Sep.)
Author:O. Takyu and M. Nakagawa


The Performance Evaluation of The Effect of Tilt Beam with Smart Antenna in Multicarrier Communication
IEEE ICCS 2006 , :pp.1-5 2006(Oct.)
Author:O. Takyu and M. Nakagawa


Evaluation of Asymmetric TDD Systems Employing AMC and HARQ by Considering MCS Selection Errors
IEEE ICCS 2006 , :pp.1-5 2006(Oct.)
Author:N. Lynn, O. Takyu, R. Esmailzadeh and M. Nakagawa


IP packet loss compensation scheme with bicast and forwarding for handover in mobile communications
IEEE PIMRC 2006 , :pp.1-5 2006(Sep.)
Author:M. Saito, A. Morimoto, O. Takyu and M. Nakagawa


Relay Method of Sending Soft Decision Symbol Based on the Result of Error Detecting Code in Cooperative Communication
International Conference on Communication Systems and Networks (CSN) 2006 , :pp.131-146 2006(Aug.)
Author:Y. Fukuyama, O. Takyu, K. Adachi, and M. Nakagawa


Companding System with Time Clustering
IEEE PIMRC 2004 , 2:pp.1075-1079 2004(Sep.)
Author:O. Takyu, T. Ohtsuki and M. Nakagawa


Criterionfor Improving Error Rate Degradation by Nonlinear Amplifier for Multicarrier Transmission
IEEE Vehicular Technology Conference (VTC 2004-Fall) , 3:pp.2029-2033 2004(Sep.)
Author:O. Takyu, T. Ohtsuki and M. Nakagawa


Frequency Offset Compensation with MMSE-MUD for Multi-Carrier CDMA in Quasi-Synchronous Uplink
IEEE International Conference on Communications (ICC 2003) , 4:pp.2485-2489 2003(May)
Author:O. Takyu, T. Ohtsuki and M. Nakagawa


Orthogonal Variable Spreading Factor Code Selection for Peak Power Reduction in Multi-Rate OFCDM Systems
IEEE Vehicular Technology Conference (VTC 2003-Spring), vol. 1 , 1:pp.117-121 2003(Apr.)
Author:O. Takyu, T. Ohtsuki and M. Nakagawa

Patents
Patents
送信装置,増幅回路及び送信方法
Research Grants
Joint Research
2009 - 2009 , アプリケーション・端末指向型スケジューリング手法
Research Activities
Journal Editorial Board
2012-2013 , 電子情報通信学会 英文論文誌B 特集号「Heterogeneous Networksfor Future Cellular Systems」
2015-2015 , 電子情報通信学会 英文論文誌B 特集号「5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies」Secretary

Journal Reviewer
2008-2011 , 電子情報通信学会 ソサイエティ誌