Takatoshi SUGIYAMA


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)