Takeo FUJII


Overloaded Wireless MIMO Switching for Information Exchanging through Untrusted Relay in Secure Wireless Communication
Arata TAKAHASHI Osamu TAKYU Hiroshi FUJIWARA Takeo FUJII Tomoaki OHTSUKI 
Publication:   
Publication Date: 2021/10/01
Vol. E104-B  No. 10  pp. 1249-1259
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Sharing for Future Wireless Systems)
Category: 
Keyword: 
wireless MIMO switchingphysical layer securitymathematical optimization
 Summary | Full Text:PDF(2MB)

Clustering for Signal Power Distribution Toward Low Storage Crowdsourced Spectrum Database
Yoji UESUGI Keita KATAGIRI Koya SATO Kei INAGE Takeo FUJII 
Publication:   
Publication Date: 2021/10/01
Vol. E104-B  No. 10  pp. 1237-1248
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Sharing for Future Wireless Systems)
Category: 
Keyword: 
spectrum databaseradio propagationclusteringfading distribution
 Summary | Full Text:PDF(2.4MB)

Towards mmWave V2X in 5G and Beyond to Support Automated Driving
Kei SAKAGUCHI Ryuichi FUKATSU Tao YU Eisuke FUKUDA Kim MAHLER Robert HEATH Takeo FUJII Kazuaki TAKAHASHI Alexey KHORYAEV Satoshi NAGATA Takayuki SHIMIZU 
Publication:   
Publication Date: 2021/06/01
Vol. E104-B  No. 6  pp. 587-603
Type of Manuscript:  INVITED SURVEY PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
automated drivingcooperative perceptionV2XV2VIEEE802.11pLTE-V2Xmillimeter-wave5GIEEE802.11ad/bdNR-V2X
 Summary | Full Text:PDF(6.4MB)

Optimal Construction of Access Rate to Superior Channel in Rendezvous Channel Based on Channel-Occupancy Ratio
Yuki NISHIO Osamu TAKYU Hayato SOYA Keiichiro SHIRAI Mai OHTA Takeo FUJII 
Publication:   
Publication Date: 2021/01/01
Vol. E104-A  No. 1  pp. 243-252
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
dynamic spectrum accessrendezvous channelchannel-occupancy ratio
 Summary | Full Text:PDF(2.3MB)

Theoretical Analyses of Maximum Cyclic Autocorrelation Selection Based Spectrum Sensing
Shusuke NARIEDA Daiki CHO Hiromichi OGASAWARA Kenta UMEBAYASHI Takeo FUJII Hiroshi NARUSE 
Publication:   
Publication Date: 2020/12/01
Vol. E103-B  No. 12  pp. 1462-1469
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
cognitive radiomaximum cyclic autocorrelation selection based spectrum sensingsignal cyclostationary
 Summary | Full Text:PDF(2.4MB)

Convolutional Neural Networks for Pilot-Induced Cyclostationarity Based OFDM Signals Spectrum Sensing in Full-Duplex Cognitive Radio
Hang LIU Xu ZHU Takeo FUJII 
Publication:   
Publication Date: 2020/01/01
Vol. E103-B  No. 1  pp. 91-102
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
full-duplex spectrum sensingcyclostationary analysisconvolutional neural networks
 Summary | Full Text:PDF(3.2MB)

A New Classification-Like Scheme for Spectrum Sensing Using Spectral Correlation and Stacked Denoising Autoencoders
Hang LIU Xu ZHU Takeo FUJII 
Publication:   
Publication Date: 2018/11/01
Vol. E101-B  No. 11  pp. 2348-2361
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
spectrum sensingcyclostationary analysisstacked denoising autoencoders
 Summary | Full Text:PDF(2MB)

Low Storage, but Highly Accurate Measurement-Based Spectrum Database via Mesh Clustering
Rei HASEGAWA Keita KATAGIRI Koya SATO Takeo FUJII 
Publication:   
Publication Date: 2018/10/01
Vol. E101-B  No. 10  pp. 2152-2161
Type of Manuscript:  Special Section PAPER (Special Section on Wireless Distributed Networks for IoT Era)
Category: 
Keyword: 
cognitive radiospectrum sensingspectrum sharingspectrum databaseclustering
 Summary | Full Text:PDF(5.2MB)

Fast Rendezvous Scheme with a Few Control Signals for Multi-Channel Cognitive Radio
Hayato SOYA Osamu TAKYU Keiichiro SHIRAI Mai OHTA Takeo FUJII Fumihito SASAMORI Shiro HANDA 
Publication:   
Publication Date: 2018/07/01
Vol. E101-B  No. 7  pp. 1589-1601
Type of Manuscript:  Special Section PAPER (Special Section on Communication Quality in Wireless Networks)
Category: 
Keyword: 
cognitive radiodynamic spectrum accessrendezvous scheme
 Summary | Full Text:PDF(3.1MB)

Smart Spectrum for Future Wireless World
Takeo FUJII Kenta UMEBAYASHI 
Publication:   
Publication Date: 2017/09/01
Vol. E100-B  No. 9  pp. 1661-1673
Type of Manuscript:  INVITED PAPER (Special Issue the Past, Present, and Future of Communications Technologies in the IEICE)
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
smart spectrumspectrum measurementspectrum usage modelingspectrum databasespectrum management
 Summary | Full Text:PDF(3.1MB)

Fusion Center Controlled MAC Protocol for Physical Wireless Parameter Conversion Sensor Networks (PHY-C SN)
Koji KAKINUMA Mai OHTA Osamu TAKYU Takeo FUJII 
Publication:   
Publication Date: 2017/07/01
Vol. E100-B  No. 7  pp. 1105-1114
Type of Manuscript:  Special Section PAPER (Special Section on Smart Radio and Its Applications in Conjunction with Main Topics of SmartCom)
Category: Network
Keyword: 
wireless sensor networksinformation collectionOFDMtransmission power control
 Summary | Full Text:PDF(2.4MB)

Cooperative Distributed STBC Transmission Scheme for Multi-Hop V2V Communications
Cong-Hoang DIEM Koya SATO Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/01/01
Vol. E99-A  No. 1  pp. 252-262
Type of Manuscript:  Special Section PAPER (Special Section on Intelligent Transport Systems)
Category: 
Keyword: 
distributed STBCOFDMmulti-hop V2V communicationsbroadcast routingcooperative communications
 Summary | Full Text:PDF(3.4MB)

Phase and Gain Imbalance Compensation in Low-IF Receivers
Teruji IDE Takeo FUJII Mamiko INAMORI Yukitoshi SANADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/01/01
Vol. E99-B  No. 1  pp. 211-223
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
low-IF receiverSDRimage rejectionphase and gain imbalance
 Summary | Full Text:PDF(3.6MB)

Measurement-Based Spectrum Database for Flexible Spectrum Management
Koya SATO Masayuki KITAMURA Kei INAGE Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/10/01
Vol. E98-B  No. 10  pp. 2004-2013
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
dynamic spectrum accesscognitive radiospectrum databaseTVWS
 Summary | Full Text:PDF(2.6MB)

Decentralized Multilevel Power Allocation for Random Access
Huifa LIN Koji ISHIBASHI Won-Yong SHIN Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/10/01
Vol. E98-B  No. 10  pp. 1978-1987
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
random accessdecentralized power allocationconvex optimizationmultipacket reception (MPR)successive interference cancellation (SIC)machine-to-machine (M2M) communications
 Summary | Full Text:PDF(1.5MB)

Information Gathering for Wireless Sensor Networks with Information Converting to Wireless Physical Parameters
Tomomi ENDOU Shunta SAKAI Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/06/01
Vol. E98-B  No. 6  pp. 984-995
Type of Manuscript:  PAPER
Category: Network
Keyword: 
wireless sensor networksinformation gatheringreal time communicationOFDM signal
 Summary | Full Text:PDF(3.6MB)

Novel Synchronization and BER Improvement Method for Public Safety Mobile Communication Systems Employing Heterogeneous Cognitive Radio
Masafumi MORIYAMA Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/04/01
Vol. E98-B  No. 4  pp. 736-745
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
public safetycognitive radiosynchronizationπ/4 shift QPSK
 Summary | Full Text:PDF(2.9MB)

Optimization of Learning Time for Learning-Assisted Rendezvous Channel in Cognitive Radio System
Osamu TAKYU Takayuki YAMAKITA Takeo FUJII Mai OHTA Fumihito SASAMORI Shiro HANDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/02/01
Vol. E98-B  No. 2  pp. 360-369
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
cognitive radiorendezvous channelChannel Occupancy Rate (COR)
 Summary | Full Text:PDF(1.9MB)

Joint Resource Allocation with Interference Constraint for Cognitive Multi-Hop Wireless Networks
Shuta KAKO Osamu TAKYU Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/02/01
Vol. E98-A  No. 2  pp. 569-577
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
cognitive radiomulti-hop networkresource allocationjoint allocation
 Summary | Full Text:PDF(1.9MB)

Distributed Resource Allocation for Multi-Cell Cognitive Radio Networks Based on Intra-Cell Overlay and Inter-Cell Underlay Spectrum Sharing
Hailan PENG Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1566-1576
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
distributed resource allocationgame theorymulti-cell overlaid CRN/PNOFDMAQoS
 Summary | Full Text:PDF(1.4MB)

Cooperative Sensing with Distributed Pre-Detection for Gathering Sensing Information on Shared Primary Spectrum
Mai OHTA Takeo FUJII Kazushi MURAOKA Masayuki ARIYOSHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/11/01
Vol. E95-A  No. 11  pp. 1980-1990
Type of Manuscript:  Special Section PAPER (Special Section on Smart Multimedia & Communication Systems)
Category: Communication Theory and Signals
Keyword: 
cognitive radiocooperative sensingorthogonal narrowband signalspectrum sharingaggregated interferencetransmit power design
 Summary | Full Text:PDF(1.6MB)

Multi-User Scheduling Method Considering Fairness and Mitigation of Multi-Cell Interference for Multi-Hop Cellular System
Yuji OKAMOTO Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/12/01
Vol. E94-A  No. 12  pp. 2746-2752
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
relayschedulingfairnessinter-cell interference
 Summary | Full Text:PDF(1.2MB)

Multi-Antenna Utilization Scheme to Prevent Packet Congestion in Wireless Mesh Networks
Norihiko SATO Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/11/01
Vol. E93-B  No. 11  pp. 3121-3128
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
adaptive array antennaMIMOSDMAwireless mesh network
 Summary | Full Text:PDF(689.3KB)

Multi-Band Received Signal Strength Fingerprinting Based Indoor Location System
Chinnapat SERTTHIN Takeo FUJII Tomoaki OHTSUKI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/08/01
Vol. E93-B  No. 8  pp. 1993-2003
Type of Manuscript:  Special Section PAPER (Special Section on Implementation, Experiments, and Practice for Ad Hoc and Mesh Networks)
Category: 
Keyword: 
fingerprintingmulti-band signalfrequency diversityindoor positioning systemreceived signal strength (RSS)multi-frequency band (multi-band) capability terminal
 Summary | Full Text:PDF(2.7MB)

A Novel Method for Information Gathering by Using Orthogonal Narrowband Signal for Cooperative Sensing in Cognitive Radio
Mai OHTA Takeo FUJII Kazushi MURAOKA Masayuki ARIYOSHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3625-3634
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Spectrum Sensing
Keyword: 
cognitive radiocooperative sensingorthogonal narrrowband signalspectrum sharing
 Summary | Full Text:PDF(501.8KB)

A Robust Spectrum Sensing Method Based on Maximum Cyclic Autocorrelation Selection for Dynamic Spectrum Access
Kazushi MURAOKA Masayuki ARIYOSHI Takeo FUJII 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3635-3643
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Spectrum Sensing
Keyword: 
cognitive radiodynamic spectrum access (DSA)spectrum sensingcyclostationary feature detection (CFD)maximum cyclic autocorrelation selection (MCAS)
 Summary | Full Text:PDF(796.2KB)

Experiment on Synchronous Timing Signal Detection from ISDB-T Terrestrial Digital TV Signal with Application to Autonomous Distributed ITS-IVC Network
Yoshio KARASAWA Taichi KUMAGAI Atsushi TAKEMOTO Takeo FUJII Kenji ITO Noriyoshi SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/01/01
Vol. E92-B  No. 1  pp. 296-305
Type of Manuscript:  PAPER
Category: Integrated Systems for Communications
Keyword: 
ITSinter-vehicle communication (IVC)ad-hoc networksynchronizationOFDMguard interval
 Summary | Full Text:PDF(1.3MB)

Forward Interference Avoidance in Ad Hoc Communications Using Adaptive Array Antennas
Tomofumi SAKAGUCHI Yukihiro KAMIYA Takeo FUJII Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/09/01
Vol. E91-B  No. 9  pp. 2940-2947
Type of Manuscript:  PAPER
Category: Terrestrial Radio Communications
Keyword: 
adaptive array antennawireless ad hoc networkad hoc communicationsinterference cancellation
 Summary | Full Text:PDF(1.1MB)

A New Blind Adaptive Array Antenna Based on CMA Criteria for M-Ary/SS Signals Suitable for Software Defined Radio Architecture
Miho KOZUMA Atsushi SASAKI Yukihiro KAMIYA Takeo FUJII Kenta UMEBAYASHI Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/08/01
Vol. E91-A  No. 8  pp. 1982-1989
Type of Manuscript:  Special Section PAPER (Special Section on Signal Processing)
Category: 
Keyword: 
blind signal processingM-ary/SSadaptive array antenna
 Summary | Full Text:PDF(796.9KB)

Dialogue-Based Broadcasting Protocol for Wireless Ad Hoc Networks
Keigo HASEGAWA Takeo FUJII Kenta UMEBAYASHI Yukihiro KAMIYA Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/07/01
Vol. E91-A  No. 7  pp. 1642-1651
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
ad hoc networkbroadcastingbroadcast storm problemmulti-hop network
 Summary | Full Text:PDF(790.5KB)

A New Blind 2D-RAKE Receiver Based on CMA Criteria for Spread Spectrum Systems Suitable for Software Defined Radio Architecture
Kei TAKAYAMA Yukihiro KAMIYA Takeo FUJII Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1906-1913
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
spread spectrumUWBadaptive array antennafrequency selective fading
 Summary | Full Text:PDF(505.1KB)

Study on Soft Decision Based Cooperative Sensing for Cognitive Radio Networks
Hiromasa UCHIYAMA Kenta UMEBAYASHI Takeo FUJII Fumie ONO Kei SAKAGUCHI Yukihiro KAMIYA Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/01/01
Vol. E91-B  No. 1  pp. 95-101
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Spectrum Sharing Technology)
Category: Spectrum Sensing
Keyword: 
cognitive radiocooperative sensingenergy detectioncognitive MIMO mesh network
 Summary | Full Text:PDF(392.8KB)

STBC Distributed ARQ Scheme for OFDM Ad-Hoc Wireless Networks
Takeo FUJII Erina KOJIMA Yukihiro KAMIYA Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/07/01
Vol. E90-A  No. 7  pp. 1323-1332
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
STBC distributed ARQad-hoc wireless networksOFDMrouting protocol
 Summary | Full Text:PDF(476.8KB)

Multi-Stage RLS OFDM Adaptive Array Antenna with Short Pilot Symbols
Takeo FUJII Yukihiro KAMIYA Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/05/01
Vol. E89-B  No. 5  pp. 1589-1597
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
OFDMadaptive array antennaRLSpacket communication
 Summary | Full Text:PDF(596KB)

Peak Power Reduction for MC-CDMA Using Cluster Assigned Code Selection
Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/09/01
Vol. E86-B  No. 9  pp. 2637-2647
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
MC-CDMApeak power problemcode selectioncode detection error recovering
 Summary | Full Text:PDF(1.5MB)

Adaptive Clipping Level Control for OFDM Peak Power Reduction Using Clipping and Filtering
Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/07/01
Vol. E85-A  No. 7  pp. 1647-1655
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
OFDMpeak power problemclipping and filteringadaptive clipping level control
 Summary | Full Text:PDF(1.1MB)

Closed-Loop Mode Phase Controlled Transmit Diversity for OFDM Using Difference Information of Phase Component among Adjacent Subcarriers
Shigenori UCHIDA Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/03/01
Vol. E85-B  No. 3  pp. 573-581
Type of Manuscript:  PAPER
Category: Fundamental Theories
Keyword: 
closed loop mode transmit diversityOFDMbroadband wireless channel
 Summary | Full Text:PDF(1.1MB)

Unicast and Broadcast Packet Sharing Method for OFDM Multi-Base Station System with Array Antenna on Mobile Terminal
Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/02/01
Vol. E85-B  No. 2  pp. 514-522
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
OFDMunicast and broadcast packetadaptive array antennafrequency sharingmulti base station
 Summary | Full Text:PDF(428.8KB)

Weighting Factor Estimation Methods for Partial Transmit Sequences OFDM to Reduce Peak Power
Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/01/01
Vol. E85-B  No. 1  pp. 221-230
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
OFDMpeak power problempartial transmit sequences (PTS)weight estimation
 Summary | Full Text:PDF(1.1MB)

Frequency Sharing CDMA Wireless LAN Using Uplink Band of P-MP TDMA Broadband Wireless Access
Takeo FUJII Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/07/25
Vol. E83-B  No. 7  pp. 1435-1444
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
wireless LANbroadband wireless accessfrequency sharing systemCDMA
 Summary | Full Text:PDF(908.3KB)