Osamu TAKYU


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)

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)

Precise BER Analysis of Repetition Coded OFDM Systems over Time- and Frequency-Selective Rayleigh Fading Channels
Fumihito SASAMORI Satoru ASADA Osamu TAKYU Shiro HANDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/01/01
Vol. E98-B  No. 1  pp. 88-98
Type of Manuscript:  Special Section PAPER (Special Section on Quality of Diversifying Communication Networks and Services)
Category: 
Keyword: 
OFDMrepetition codingmaximal ratio combiningfading correlationclosed-form equation
 Summary | Full Text:PDF(2.6MB)

Resource Block Assignment to Reduce Peak to Average Power Ratio in Multi-User OFDM
Osamu TAKYU Yohtaro UMEDA Fumihito SASAMORI Shiro HANDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/08/01
Vol. E97-B  No. 8  pp. 1689-1700
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiuser OFDMPAPRresource block assignment
 Summary | Full Text:PDF(2MB)

Adaptive Iterative Decoding of Finite-Length Differentially Encoded LDPC Coded Systems with Multiple-Symbol Differential Detection
Yang YU Shiro HANDA Fumihito SASAMORI Osamu TAKYU 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/03/01
Vol. E96-B  No. 3  pp. 847-858
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
adaptive iterative decodinglow-density parity-check (LDPC) codesdifferential encoded LDPC coded systemsmultiple-symbol differential detectionextrinsic information transfer (EXIT) band chart
 Summary | Full Text:PDF(1.6MB)

Phase Rotation for Constructing Uniform Frequency Spectrum in IFDMA Communication
Takeo YAMASAKI Osamu TAKYU Koichi ADACHI Yohtaro UMEDA Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/12/01
Vol. E93-A  No. 12  pp. 2672-2681
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
SC-FDMAIFDMAdecision directed channel estimation (DDCE)phase rotation
 Summary | Full Text:PDF(1.1MB)

Frequency Rotation for Suppressing Multipath Interference and Achieving Large Frequency Diversity in Uplink IFDMA
Osamu TAKYU Yohtaro UMEDA Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/05/01
Vol. E93-B  No. 5  pp. 1284-1288
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
IFDMAfrequency rotationsuppressingmultipath interference
 Summary | Full Text:PDF(469.5KB)

Scattered Pilot Assisted Channel Estimation for IFDMA Uplink
Takeo YAMASAKI Osamu TAKYU Yohtaro UMEDA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3803-3814
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
SC-FDMAIFDMAScattered Pilot Assisted Channel EstimationPAPR
 Summary | Full Text:PDF(2.4MB)

Frequency Spectrum Rotation in Interleaved Frequency Division Multiplexing
Osamu TAKYU Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/07/01
Vol. E91-B  No. 7  pp. 2357-2365
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
interleaved FDMfrequency spectrum rotation
 Summary | Full Text:PDF(1.1MB)

Relay Method of Sending Soft Decision Symbol Based on the Result of Error Detecting Code in Cooperative Communication
Yuki FUKUYAMA Osamu TAKYU Koichi ADACHI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/11/01
Vol. E90-A  No. 11  pp. 2404-2412
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: OFDM/Relay
Keyword: 
cooperative communicationtransmit diversitysoft decision symbolCRC
 Summary | Full Text:PDF(722.3KB)

Evaluation of Asymmetric TDD Systems Employing AMC and HARQ by Considering MCS Selection Errors
Nandar LYNN Osamu TAKYU Riaz ESMAILZADEH Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/11/01
Vol. E89-A  No. 11  pp. 3138-3147
Type of Manuscript:  Special Section PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
TDDasymmetric slot allocationAMCMCS selection error
 Summary | Full Text:PDF(938.8KB)

Companding System Based on Time Clustering for Reducing Peak Power of OFDM Symbol in Wireless Communications
Osamu TAKYU Tomoaki OHTSUKI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/07/01
Vol. E89-A  No. 7  pp. 1884-1891
Type of Manuscript:  Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
peak power problemOFDM symbolcompressing and expanding (companding) system
 Summary | Full Text:PDF(467.7KB)

A Sign Selection Method of Orthogonal Variable Spreading Factor Code for Peak Power Reduction in Multi-Rate OFCDM Systems
Osamu TAKYU Tomoaki OHTSUKI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/04/01
Vol. E89-B  No. 4  pp. 1333-1345
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
OFCDMmulti-rate communicationOVSF codepeak power problem
 Summary | Full Text:PDF(1.3MB)

Criterion for Reducing Error Rate Degradation by Nonlinear Amplifier for Multicarrier Transmission
Osamu TAKYU Tomoaki OHTSUKI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/07/01
Vol. E88-B  No. 7  pp. 3057-3061
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
multi-carrier transmissionnonlinear distortionpeak power problem
 Summary | Full Text:PDF(289.8KB)

Frequency Offset Compensation with MMSE-MUD for Multi-Carrier CDMA in Quasi-Synchronous Uplink
Osamu TAKYU Tomoaki OHTSUKI Masao NAKAGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/06/01
Vol. E87-B  No. 6  pp. 1495-1504
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
MC-CDMAMMSE-MUDfrequency offset compensationquasi-synchronousuplink
 Summary | Full Text:PDF(758.8KB)