Takatoshi SUGIYAMA


Undesired Radiation Suppression Technique for Distributed Array Antenna by Antenna Positioning and Delay Signal Processing
Kouhei SUZUKI Hideya SO Daisuke GOTO Yoshinori SUZUKI Fumihiro YAMASHITA Katsuya NAKAHIRA Kiyoshi KOBAYASHI Takatoshi SUGIYAMA 
Publication:   
Publication Date: 2017/10/01
Vol. E100-B  No. 10  pp. 1959-1967
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
distributed array antenna (DAA)undesired radiation suppressiondelay compensationsatellite communication
 Summary | Full Text:PDF(4.5MB)

Throughput Enhancement for SATCOM Systems Using Dynamic Spectrum Controlled Channel Allocation under Variable Propagation Conditions
Katsuya NAKAHIRA Jun MASHINO Jun-ichi ABE Daisuke MURAYAMA Tadao NAKAGAWA Takatoshi SUGIYAMA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 390-399
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
satellite communicationchannel allocationresource controladaptive coding and modulationspectrum compressionspectrum divisiondemand assigned multiple access
 Summary | Full Text:PDF(2.6MB)

Blind Interference Suppression Scheme by Eigenvector Beamspace CMA Adaptive Array with Subcarrier Transmission Power Assignment for Spectrum Superposing
Kazuki MARUTA Jun MASHINO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/06/01
Vol. E98-B  No. 6  pp. 1050-1057
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
adaptive arraySubcarrier Transmission Power Assignment (STPA)blind algorithmEigenvector Beamspace Adaptive Array (EBAA)Constant Modulus Algorithm (CMA)spectrum superposing
 Summary | Full Text:PDF(2.9MB)

Path Loss Variation Characteristics at 26GHz Band in Street Microcell Environment
Motoharu SASAKI Wataru YAMADA Takatoshi SUGIYAMA Tetsuro IMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/05/01
Vol. E98-B  No. 5  pp. 783-789
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Radio Propagation)
Category: 
Keyword: 
propagationmillimeter wavestreet micro-cellfading
 Summary | Full Text:PDF(2MB)

Hybrid Station Aided Coexistence Scheme between Wireless PANs and Wireless LAN
Fumihiro INOUE Takayuki NISHIO Masahiro MORIKURA Koji YAMAMOTO Fusao NUNO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/02/01
Vol. E98-A  No. 2  pp. 578-588
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: 
Keyword: 
coexistenceIEEE 802.15.4IEEE 802.11ZigBeeWLANWPANWSNQoS
 Summary | Full Text:PDF(2.2MB)

Multiband Sector Antenna with the Same Beamwidth Employing Multiple Woodpile Metamaterial Reflectors
Hideya SO Atsuya ANDO Tomohiro SEKI Munenari KAWASHIMA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/10/01
Vol. E97-C  No. 10  pp. 976-985
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
sector base station antennamultiband antennametamaterialelectromagnetic band gap (EBG) characteristics
 Summary | Full Text:PDF(2MB)

Path Loss Model for Low Antenna Heights in Residential Areas at Middle VHF Band
Motoharu SASAKI Wataru YAMADA Naoki KITA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/10/01
Vol. E97-B  No. 10  pp. 2093-2101
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Measurement and Design Techniques on Antennas, Propagation and Wireless Systems)
Category: 
Keyword: 
path loss modellow antenna heightmobile terminalresidential areaVHF band
 Summary | Full Text:PDF(7.4MB)

Virtual Continuous CWmin Control Scheme of WLAN
Yuki SANGENYA Fumihiro INOUE Masahiro MORIKURA Koji YAMAMOTO Fusao NUNO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/01/01
Vol. E97-A  No. 1  pp. 40-48
Type of Manuscript:  Special Section PAPER (Special Section on Wideband Systems)
Category: Foundations
Keyword: 
CSMA/CAIEEE 802.11 DCFCWmin controlfairnessperformance analysis model
 Summary | Full Text:PDF(1.4MB)

Path Loss Model with Low Antenna Height for Microwave Bands in Residential Areas
Motoharu SASAKI Wataru YAMADA Naoki KITA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/07/01
Vol. E96-B  No. 7  pp. 1930-1944
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
path loss modellow antenna heightmobile terminalresidential areamicrowave band
 Summary | Full Text:PDF(3.3MB)

Implementation of a TDMA Based Wireless Network Coding Prototype System with Ethernet Frame Aggregation
Nobuaki OTSUKI Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/12/01
Vol. E95-B  No. 12  pp. 3752-3759
Type of Manuscript:  Special Section PAPER (Special Section on Coding and Coding Theory-Based Signal Processing for Wireless Communications)
Category: 
Keyword: 
wireless network codingmultihopTDMAGPS
 Summary | Full Text:PDF(3.3MB)

Wireless Network Coding Diversity Technique Based on Hybrid AF/DF Relay Method Employing Adaptive Power Control at Relay Node for Bidirectional Two-Hop Wireless Networks
Nobuaki OTSUKI Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/12/01
Vol. E95-B  No. 12  pp. 3772-3785
Type of Manuscript:  PAPER
Category: Fundamental Theories for Communications
Keyword: 
wireless network codingdiversityerror propagationposition flexibility
 Summary | Full Text:PDF(4.2MB)

Novel Polarization-Tracking-Free Mobile Satellite Communication Systems and On-Ground Polarization-Forming Technique
Yoshinori SUZUKI Takatoshi SUGIYAMA Kiyoshi KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/11/01
Vol. E95-B  No. 11  pp. 3412-3419
Type of Manuscript:  Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2011)
Category: 
Keyword: 
communication satelliteearth stationand polarization forming
 Summary | Full Text:PDF(1.6MB)

Novel Channel Allocation Algorithm Using Spectrum Control Technique for Effective Usage of both Satellite Transponder Bandwidth and Satellite Transmission Power
Katsuya NAKAHIRA Jun-ichi ABE Jun MASHINO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/11/01
Vol. E95-B  No. 11  pp. 3393-3403
Type of Manuscript:  Special Section PAPER (Special Section on Satellite Communication Technologies in Conjunction with Main Topics of JC-SAT2011)
Category: 
Keyword: 
satellite communicationchannel allocationadaptive coding and modulationmulti-carrier transmissionsingle-carrier transmissionspectrum compressionspectrum divisionDAMA
 Summary | Full Text:PDF(2.3MB)

A Highly Efficient DAMA Algorithm for Making Maximum Use of both Satellite Transponder Bandwidth and Transmission Power
Katsuya NAKAHIRA Takatoshi SUGIYAMA Hiroki NISHIYAMA Nei KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/08/01
Vol. E95-B  No. 8  pp. 2619-2630
Type of Manuscript:  PAPER
Category: Satellite Communications
Keyword: 
satellite communicationchannel allocationadaptive modulation and codingmulti-carrier transmissionDAMA
 Summary | Full Text:PDF(2.3MB)

Spectral Efficiency Improvement of Fractional Frequency Reuse by Inter-Cell Interference Cancellation on Cooperative Base Station
Kazuki MARUTA Atsushi OHTA Masataka IIZUKA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/06/01
Vol. E95-B  No. 6  pp. 2164-2168
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
inter-cell interference cancellationbase station cooperationfractional frequency reuse
 Summary | Full Text:PDF(1.2MB)

Enhancement of CSMA/CA and Network Coding in Single-Relay Multi-User Wireless Networks
Chun-Hsiang HUANG Daisuke UMEHARA Satoshi DENNO Masahiro MORIKURA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3371-3380
Type of Manuscript:  Special Section PAPER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
single-relay multi-user networksnetwork codingCSMA/CACWmin optimizationwireless throughputfairness
 Summary | Full Text:PDF(1MB)

Plane-Wave and Vector-Rotation Approximation Technique for Reducing Computational Complexity to Simulate MIMO Propagation Channel Using Ray-Tracing
Wataru YAMADA Naoki KITA Takatoshi SUGIYAMA Toshio NOJIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3850-3860
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMO propagation channel prediction techniqueray-tracing methodimaging algorithmsubstitution technique
 Summary | Full Text:PDF(1.6MB)

A Reduced-Complexity Signal Detection Scheme Employing ZF and K-Best Algorithms for OFDM/SDM
Takafumi FUJITA Atsushi OHTA Takeshi ONIZAWA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 66-75
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Space Division Multiplexing
Keyword: 
OFDMSDMMIMOMLDZero-ForcingK-bestM-algorithmIEEE 802.11a
 Summary | Full Text:PDF(806.4KB)

Implementation and Performance Evaluation of Simple SDM-COFDM Prototype Using Propagation Coefficient Matrix Tracking for Fast Fading MIMO Channels
Takatoshi SUGIYAMA Satoshi KUROSAKI Daisei UCHIDA Yusuke ASAI Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/01/01
Vol. E88-B  No. 1  pp. 58-65
Type of Manuscript:  Special Section PAPER (Special Section on Multi-carrier Signal Processing Techniques for Next Generation Mobile Communications--Part 1)
Category: Space Division Multiplexing
Keyword: 
SDMOFDMMIMOZFfrequency utilization efficiency
 Summary | Full Text:PDF(1.8MB)

A SDM-COFDM Scheme Employing a Simple Feed-Forward Inter-Channel Interference Canceller for MIMO Based Broadband Wireless LANs
Satoshi KUROSAKI Yusuke ASAI Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 283-290
Type of Manuscript:  Special Section PAPER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
SDM-COFDMMIMOpropagation matrixlikelihood-weightingsoft decision Viterbi decoding
 Summary | Full Text:PDF(1.6MB)

OFDM/CDMA Technologies for Future Broadband Mobile Communication Systems
Masahiro UMEHIRA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/12/01
Vol. E85-A  No. 12  pp. 2804-2812
Type of Manuscript:  INVITED PAPER (Special Section on Spread Spectrum Techniques and Applications)
Category: 
Keyword: 
CDMAOFDMSDMMIMOlink adaptation
 Summary | Full Text:PDF(3.8MB)

An FFT Interference Detection Scheme for Interference Suppression in Digital Satellite Communication Systems
Takatoshi SUGIYAMA Masanobu SUZUKI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/09/25
Vol. E80-B  No. 9  pp. 1352-1362
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
digital satellite communicationco-channel interferenceinterference suppressionnotch filterFECFFT
 Summary | Full Text:PDF(740.8KB)

A Novel FEC Scheme for Differentially Detected QPSK Signals in Mobile Computing Using High-Speed Wireless Access
Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/08/25
Vol. E80-B  No. 8  pp. 1153-1159
Type of Manuscript:  Special Section PAPER (Special Issue on Mobile Computing)
Category: 
Keyword: 
mobile computinghigh-speed wireless accessdifferential detectionnonredundant error correctiondouble symbol errorparallel encoding random FECrician fading
 Summary | Full Text:PDF(540.1KB)

A New AFC Circuit Employing Double-Product Type Frequency Discriminator in Very-Low CNR Environments
Nobuaki MOCHIZUKI Takatoshi SUGIYAMA Masahiro UMEHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/01/25
Vol. E80-B  No. 1  pp. 25-32
Type of Manuscript:  Special Section PAPER (Special Issue on Advances in Satellite Communications toward Multimedia Era)
Category: Modem and Coding
Keyword: 
multimedia satellite communicationhigh coding gain FECvery-low CNR environmentsAFCdouble-product type frequency discriminatorclick noise
 Summary | Full Text:PDF(603KB)

A Half-Chip Offset QPSK Modulation CDMA Scheme Employing Differential Detection for Advanced Wireless LAN Systems
Takatoshi SUGIYAMA Masato MIZOGUCHI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/05/25
Vol. E79-B  No. 5  pp. 693-700
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
offset QPSK-CDMAnonlinear channeldifferential detectionforward error correctiontime diversityfrequency utilization efficiency
 Summary | Full Text:PDF(582.5KB)

An Integrated Interference Suppression Scheme with An Adaptive Equalizer for Digital Satellite Communication Systems
Takatoshi SUGIYAMA Masanobu SUZUKI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/02/25
Vol. E79-B  No. 2  pp. 191-197
Type of Manuscript:  PAPER
Category: Satellite Communication
Keyword: 
satellite communicationco-channel interferenceinterference suppressionnotch filterFECadaptive equalizer
 Summary | Full Text:PDF(546.3KB)

A Frequency Utilization Ffficiency Improvement on Superposed SSMA-QPSK Signal Transmission over High Speed QPSK Signals in Nonlinear Channels
Takatoshi SUGIYAMA Hiroshi KAZAMA Masahiro MORIKURA Shuji KUBOTA Shuzo KATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/05/25
Vol. E76-B  No. 5  pp. 480-487
Type of Manuscript:  Special Section PAPER (Special Issue on Satellite Communications Networking and Applications)
Category: 
Keyword: 
SSMA-QPSK signalshigh speed QPSK signalssuperposed transmissionFECinterference cancellationnon-linear channel
 Summary | Full Text:PDF(687.3KB)