Takeo FUJII


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)

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)

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)

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)

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)

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 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)

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)

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)