Jun-ichi TAKADA


920MHz Path Loss Prediction Formula Based on FDTD Method for IoT Wireless System close to Ceiling with Concrete Beam
Naotake YAMAMOTO Taichi SASAKI Atsushi YAMAMOTO Tetsuya HISHIKAWA Kentaro SAITO Jun-ichi TAKADA Toshiyuki MAEYAMA 
Publication:   
Publication Date: 2022/12/01
Vol. E105-B  No. 12  pp. 1540-1547
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
indoor propagationFDTD920MHz bandpropagation near ceiling with beamIoTpath loss prediction
 Summary | Full Text:PDF(3.2MB)

Millimeter-Wave Radio Channel Characterization Using Multi-Dimensional Sub-Grid CLEAN Algorithm
Minseok KIM Tatsuki IWATA Shigenobu SASAKI Jun-ichi TAKADA 
Publication:   
Publication Date: 2020/07/01
Vol. E103-B  No. 7  pp. 767-779
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
channel soundingmillimeter wavedirectional scanningCLEAN algorithmparameter estimationpolarizationindoor channel
 Summary | Full Text:PDF(13.1MB)

Dual-Band Dual-Rectangular-Loop Circular Polarization Antenna for Global Navigation Satellite System
Makoto SUMI Jun-ichi TAKADA 
Publication:   
Publication Date: 2019/12/01
Vol. E102-B  No. 12  pp. 2243-2252
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
dual-bandcircular polarizationrectangular loop with a gapGNSSprecise positioning
 Summary | Full Text:PDF(2.3MB)

Characterization of Broadband Mobile Communication Channel in 200MHz Band Based on Saleh-Valenzuela Model
Hiroki OHARA Hirokazu SAWADA Masayuki OODO Fumihide KOJIMA Hiroshi HARADA Kentaro SAITO Jun-ichi TAKADA 
Publication:   
Publication Date: 2018/11/01
Vol. E101-B  No. 11  pp. 2277-2288
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
VHF propagationmobile communicationpublic broadband mobile communication (PBB) systemimpulse responsechannel model
 Summary | Full Text:PDF(4.5MB)

A Guide of Fingerprint Based Radio Emitter Localization Using Multiple Sensors
Tao YU Azril HANIZ Kentaro SANO Ryosuke IWATA Ryouta KOSAKA Yusuke KUKI Gia Khanh TRAN Jun-ichi TAKADA Kei SAKAGUCHI 
Publication:   
Publication Date: 2018/10/01
Vol. E101-B  No. 10  pp. 2104-2119
Type of Manuscript:  INVITED PAPER (Special Section on Wireless Distributed Networks for IoT Era)
Category: 
Keyword: 
Internet-of-Thingswireless distributed sensorsradio emitter localizationfingerprintdifferent applicationsguidelineprototyping
 Summary | Full Text:PDF(3.9MB)

Multi-Dimensional Radio Channel Measurement, Analysis and Modeling for High Frequency Bands
Minseok KIM Jun-ichi TAKADA Kentaro SAITO 
Publication:   
Publication Date: 2018/02/01
Vol. E101-B  No. 2  pp. 293-308
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: 
Keyword: 
radio channelpropagationchannel sounderchannel modelhigh frequencymillimeter-waveMIMO
 Summary | Full Text:PDF(7MB)

Double Directional Millimeter Wave Propagation Channel Measurement and Polarimetric Cluster Properties in Outdoor Urban Pico-cell Environment
Karma WANGCHUK Kento UMEKI Tatsuki IWATA Panawit HANPINITSAK Minseok KIM Kentaro SAITO Jun-ichi TAKADA 
Publication:   
Publication Date: 2017/07/01
Vol. E100-B  No. 7  pp. 1133-1144
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
millimeter waveurban pico-celldouble directional channelpropagation mechanismsangular spreadpolarizationcluster
 Summary | Full Text:PDF(6.2MB)

3-Port MIMO DRAs for 2.4GHz WLAN Communications
Katsunori ISHIMIYA Chi-Yuk CHIU Zhinong YING Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/09/01
Vol. E99-B  No. 9  pp. 2047-2054
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
DRAMIMOfinite integration techniquewireless LANIEEE 802.11n
 Summary | Full Text:PDF(1.5MB)

Human Motion Classification Using Radio Signal Strength in WBAN
Sukhumarn ARCHASANTISUK Takahiro AOYAGI Tero UUSITUPA Minseok KIM Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/03/01
Vol. E99-B  No. 3  pp. 592-601
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication Technology for Healthcare and Medical Applications in Conjunction with Main Topics of ISMICT2015)
Category: 
Keyword: 
human motionsclassificationradio signal strengthWBANsimulation
 Summary | Full Text:PDF(2MB)

Propagation Channel Interpolation for Fingerprint-Based Localization of Illegal Radios
Azril HANIZ Gia Khanh TRAN Ryosuke IWATA Kei SAKAGUCHI Jun-ichi TAKADA Daisuke HAYASHI Toshihiro YAMAGUCHI Shintaro ARATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/12/01
Vol. E98-B  No. 12  pp. 2508-2519
Type of Manuscript:  PAPER
Category: Sensing
Keyword: 
propagation channelfrequency interpolationspatial interpolationurban environmentillegal radiolocalizationfingerprint
 Summary | Full Text:PDF(3.1MB)

Cooperative Relaying Channel and Outage Performance in Narrowband Wireless Body Area Network
Karma WANGCHUK Minseok KIM Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/04/01
Vol. E98-B  No. 4  pp. 554-564
Type of Manuscript:  Special Section PAPER (Special Section on Innovation of Medical Information and Communication Technology for Dependable Society)
Category: 
Keyword: 
body area networkmulti-link channelcooperative communicationincremental relayingoutage probability
 Summary | Full Text:PDF(1.4MB)

EM-Based Recursive Estimation of Spatiotemporal Correlation Statistics for Non-stationary MIMO Channel
Yousuke NARUSE Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/02/01
Vol. E98-B  No. 2  pp. 324-334
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOchannel estimationGauss-Markov modelKalman filterEM algorithmposterior probability
 Summary | Full Text:PDF(997KB)

Versatile Radio Channel Sounder for Double Directional and Multi-link MIMO Channel Measurements at 11 GHz
Yohei KONISHI Yuyuan CHANG Minseok KIM Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/10/01
Vol. E97-C  No. 10  pp. 994-1004
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
channel soundingmultiple-input-multiple-output (MIMO) systemmulti-linkmicrowave propagation
 Summary | Full Text:PDF(4.1MB)

A Spatial Fading Emulator for Evaluation of MIMO Antennas in a Cluster Environment
Tsutomu SAKATA Atsushi YAMAMOTO Koichi OGAWA Hiroshi IWAI Jun-ichi TAKADA Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/10/01
Vol. E97-B  No. 10  pp. 2127-2135
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Measurement and Design Techniques on Antennas, Propagation and Wireless Systems)
Category: 
Keyword: 
fading emulatorclusterangular power spectrumOTAhandset antennaMIMOchannel capacity
 Summary | Full Text:PDF(2.4MB)

Pattern Reconstruction for Deviated AUT in Spherical Measurement by Using Spherical Waves
Yang MIAO Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/01/01
Vol. E97-B  No. 1  pp. 105-113
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
antenna pattern reconstructionspherical wave expansiondeviated AUTtranslational phase shiftrotation and translation of spherical waves
 Summary | Full Text:PDF(1.7MB)

Spectral Correlation Based Blind Automatic Modulation Classification Using Symbol Rate Estimation
Azril HANIZ Minseok KIM Md. Abdur RAHMAN Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/05/01
Vol. E96-B  No. 5  pp. 1158-1167
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
modulationclassificationsymbol rateestimationcyclostationarityspectral correlation
 Summary | Full Text:PDF(1.8MB)

Robustness in Supervised Learning Based Blind Automatic Modulation Classification
Md. Abdur RAHMAN Azril HANIZ Minseok KIM Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/04/01
Vol. E96-B  No. 4  pp. 1030-1038
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
automatic modulation classification (AMC)emergency radiomobile radioCFOsymbol ratedenoisingEMDdecision tree
 Summary | Full Text:PDF(1.3MB)

Implementation of Reflection on Curved Surfaces and Physical Optics in Ray Tracing for Tunnel Propagation
Yukiko KISHIKI Jun-ichi TAKADA Gilbert Siy CHING Hajime TAKAO Yoshihiro SUGIHARA Shigeaki MATSUNAGA Fumiya UESAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/01/01
Vol. E96-C  No. 1  pp. 42-50
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: Radiowave Propagation
Keyword: 
ray tracingphysical opticsrough surfacescurved reflectiontunnel propagationcaustics
 Summary | Full Text:PDF(1.9MB)

Analysis of Effect of User Misbehaviours on the Reservation-Based MAC Protocols in Wireless Communication Networks
Norrarat WATTANAMONGKHOL Warakorn SRICHAVENGSUP Pisit VANICHCHANUNT Robithoh ANNUR Jun-ichi TAKADA Lunchakorn WUTTISITTIKULKIJ 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/09/01
Vol. E95-B  No. 9  pp. 2794-2806
Type of Manuscript:  PAPER
Category: Network
Keyword: 
channel reservationMAC protocolsselfish usersmisbehaviourswireless networks
 Summary | Full Text:PDF(2.8MB)

Automatic IQ Imbalance Compensation Technique for Quadrature Modulator by Single-Tone Testing
Minseok KIM Yohei KONISHI Jun-ichi TAKADA Boxin GAO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/05/01
Vol. E95-B  No. 5  pp. 1864-1868
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
quadrature modulatorIQ imbalanceimage distortionsteepest descentspectrum analyzer
 Summary | Full Text:PDF(259.8KB)

Performance Enhancement of Multi-Cyclic Detector for Cognitive Radios with an OFDM Primary System
Minseok KIM Kimtho PO Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/03/01
Vol. E95-B  No. 3  pp. 950-960
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
cognitive radiospectrum sensingcyclostationaritycyclic detectormaximum ratio combiningOFDMIEEE 802.22
 Summary | Full Text:PDF(836.1KB)

Optimum Threshold for Indoor UWB ToA-Based Ranging
Marzieh DASHTI Mir GHORAISHI Katsuyuki HANEDA Jun-ichi TAKADA Kenichi TAKIZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/10/01
Vol. E94-A  No. 10  pp. 2002-2012
Type of Manuscript:  PAPER
Category: Spread Spectrum Technologies and Applications
Keyword: 
rangingpositioningultra-wide-bandtime-of-arrival estimationdetection
 Summary | Full Text:PDF(1.2MB)

Numerical Simulations for Wearable BAN Propagation Channel during Various Human Movements
Takahiro AOYAGI Minseok KIM Jun-ichi TAKADA Kiyoshi HAMAGUCHI Ryuji KOHNO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/09/01
Vol. E94-B  No. 9  pp. 2496-2500
Type of Manuscript:  Special Section LETTER (Special Section on Information Communication Technology for Highly Reliable Human Health Care Services)
Category: 
Keyword: 
body area networkmedical supporthealthcare serviceelectromagnetic wave propagationdynamic channel model
 Summary | Full Text:PDF(328.6KB)

Waveform Distortion and Transmission Gain on Ultra Wideband Impulse Radio
Sathaporn PROMWONG Pichaya SUPANAKOON Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2644-2650
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Radio Systems
Keyword: 
ultra wideband impulse radio (UWB-IR)Friis' transmission formulaantennadistortiontransmission gain
 Summary | Full Text:PDF(809KB)

Development of an Implantable WBAN Path-Loss Model for Capsule Endoscopy
Takahiro AOYAGI Kenichi TAKIZAWA Takehiko KOBAYASHI Jun-ichi TAKADA Kiyoshi HAMAGUCHI Ryuji KOHNO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/04/01
Vol. E93-B  No. 4  pp. 846-849
Type of Manuscript:  Special Section LETTER (Special Section on Information and Communication Technology for Wellness and Medical Applications)
Category: 
Keyword: 
wireless body area network (WBAN)implantable WBANcapsule endoscopypath loss model
 Summary | Full Text:PDF(220.9KB)

FOREWORD
Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3571-3571
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(54.3KB)

Signal Subspace Interpolation from Discrete Measurement Samples in Constructing a Database for Location Fingerprint Technique
Panarat CHERNTANOMWONG Jun-ichi TAKADA Hiroyuki TSUJI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/09/01
Vol. E92-B  No. 9  pp. 2922-2930
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
localizationfingerprint techniquearray antennasignal subspace
 Summary | Full Text:PDF(795.6KB)

Iterative Channel Estimation in MIMO Antenna Selection Systems for Correlated Gauss-Markov Channel
Yousuke NARUSE Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/03/01
Vol. E92-B  No. 3  pp. 922-932
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOchannel estimationGauss-Markov modelKalman filterMIMO antenna selection systemoptimal training symbol design
 Summary | Full Text:PDF(565.4KB)

Channel Model on Various Frequency Bands for Wearable Body Area Network
Norihiko KATAYAMA Kenichi TAKIZAWA Takahiro AOYAGI Jun-ichi TAKADA Huan-Bang LI Ryuji KOHNO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/02/01
Vol. E92-B  No. 2  pp. 418-424
Type of Manuscript:  Special Section PAPER (Special Section on Medical Information and Communications Technologies)
Category: 
Keyword: 
body area network (BAN)wearable BAN channel modelpath loss model
 Summary | Full Text:PDF(1.3MB)

Experimental Analysis and Site-Specific Modeling of Channel Parameters at Mobile Station in an Urban Macrocellular Environment
Kriangsak SIVASONDHIVAT Jun-ichi TAKADA Ichirou IDA Yasuyuki OISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/04/01
Vol. E91-B  No. 4  pp. 1132-1144
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
double directional measurementangular-delay PSD channel model
 Summary | Full Text:PDF(1022KB)

Effects of Bragg Scattering on Ultra-Wideband Signal Transmission from Periodic Surfaces
Hiroaki TSUCHIYA Navarat LERTSIRISOPON Jun-ichi TAKADA Takehiko KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/02/01
Vol. E91-B  No. 2  pp. 536-542
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
Bragg scatteringultra-widebandUWB transmissionpropagation
 Summary | Full Text:PDF(908.8KB)

Proposal of Receive Antenna Selection Methods for MIMO-OFDM System
Quoc Tuan TRAN Shinsuke HARA Kriangsak SIVASONDHIVAT Jun-ichi TAKADA Atsushi HONDA Yuuta NAKAYA Kaoru YOKOO Ichirou IDA Yasuyuki OISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/02/01
Vol. E91-B  No. 2  pp. 505-517
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMO-OFDMMMSERF switchpolarizationantenna selectionIEEE 802.11n
 Summary | Full Text:PDF(1.5MB)

Accurate Angle-of-Arrival Estimation Method in Real System by Applying Calibration and Spatial Smoothing
Panarat CHERNTANOMWONG Jun-ichi TAKADA Hiroyuki TSUJI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/10/01
Vol. E90-B  No. 10  pp. 2915-2925
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
AOA estimationcalibrationspatial smoothing
 Summary | Full Text:PDF(564.9KB)

Performance Evaluation of Built-In Small LF Antennas inside a Metal Case
Kazuaki ABE Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/09/01
Vol. E90-C  No. 9  pp. 1784-1792
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Antennas/Systems
Keyword: 
magnetic core loop antennaamorphous metalLFmagnetic field simulation
 Summary | Full Text:PDF(937.4KB)

Simulation and Design of a Very Small Magnetic Core Loop Antenna for an LF Receiver
Kazuaki ABE Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/01/01
Vol. E90-B  No. 1  pp. 122-130
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
magnetic core loop antennaLFtime standardantenna factormagnetic field simulation
 Summary | Full Text:PDF(1MB)

Development of MIMO-SDR Platform and Its Application to Real-Time Channel Measurements
Kei MIZUTANI Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/12/01
Vol. E89-B  No. 12  pp. 3197-3207
Type of Manuscript:  Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
multiple-input multiple-output (MIMO)software defined radio (SDR)hybrid implementation architecturereal-time channel measurement
 Summary | Full Text:PDF(1.5MB)

Overview of Research, Development, Standardization, and Regulation Activities in NICT UWB Project
Ken-ichi TAKIZAWA Huan-Bang LI Iwao NISHIYAMA Jun-ichi TAKADA Ryuji KOHNO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/11/01
Vol. E89-A  No. 11  pp. 2996-3005
Type of Manuscript:  INVITED PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
UWBsoft spectrum adaptation (SSA)coexistencedetection and avoidance (DAA)spectrum maskITU-R TG1/8radar
 Summary | Full Text:PDF(1.3MB)

Investigation of Ultra-Wideband Propagation Channel based on a Cluster Scheme
Hiroaki TSUCHIYA Katsuyuki HANEDA Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/11/01
Vol. E89-A  No. 11  pp. 3095-3102
Type of Manuscript:  Special Section PAPER (Special Section on Wide Band Systems)
Category: 
Keyword: 
Ultra Widebanddouble directionalUWB channel modelcluster
 Summary | Full Text:PDF(1.2MB)

Performance Evaluation for RF-Combining Diversity Antenna Configured with Variable Capacitors
Hiroya TANAKA Jun-ichi TAKADA Ichirou IDA Yasuyuki OISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/04/01
Vol. E89-C  No. 4  pp. 488-494
Type of Manuscript:  Special Section PAPER (Special Section on Advanced RF Technologies for Compact Wireless Equipment and Mobile Phones)
Category: 
Keyword: 
mobile systemsadaptive array antennasdiversity antennasvariable capacitorRF-combining diversity antennasperturbation methodsteepest gradient method
 Summary | Full Text:PDF(635.5KB)

Spatial Fading Simulator Using a Cavity-Excited Circular Array (CECA) for Performance Evaluation of Antenna Arrays
Chulgyun PARK Jun-ichi TAKADA Kei SAKAGUCHI Takashi OHIRA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/03/01
Vol. E89-B  No. 3  pp. 906-913
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
spatial fading simulatorcavityCECAantenna array performance evaluation
 Summary | Full Text:PDF(1.1MB)

Measurement Techniques of Emissions from Ultra Wideband Devices
Jun-ichi TAKADA Shinobu ISHIGAMI Juichi NAKADA Eishin NAKAGAWA Masaharu UCHINO Tetsuya YASUI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/09/01
Vol. E88-A  No. 9  pp. 2252-2263
Type of Manuscript:  INVITED PAPER (Special Section on Ultra Wideband Systems)
Category: 
Keyword: 
UWB devicesmeasurementITU-R
 Summary | Full Text:PDF(676.1KB)

Double Directional Ultra Wideband Channel Characterization in a Line-of-Sight Home Environment
Katsuyuki HANEDA Jun-ichi TAKADA Takehiko KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/09/01
Vol. E88-A  No. 9  pp. 2264-2271
Type of Manuscript:  Special Section PAPER (Special Section on Ultra Wideband Systems)
Category: Propagation
Keyword: 
ultra widebandUWB channel modelsSAGE algorithmspatio-temporal analysis
 Summary | Full Text:PDF(1.3MB)

Experimental Determination of Propagation Paths for the ETC System--Equipment Development and Field Test--
Katsuyuki HANEDA Jun-ichi TAKADA Takeo IWATA Yoshitaka WAKINAKA Takeshi KUNISHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/11/01
Vol. E87-A  No. 11  pp. 3008-3015
Type of Manuscript:  PAPER
Category: Intelligent Transport System
Keyword: 
ETCDSRCpropagationshort range wireless communicationmeasurement systempath determination3-D unitary ESPRITSAGE algorithm
 Summary | Full Text:PDF(444.2KB)

Six-Port Direct Conversion Receiver: Novel Calibration for Multi-Port Nonlinear Circuits
Atsushi HONDA Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/09/01
Vol. E87-C  No. 9  pp. 1532-1539
Type of Manuscript:  Special Section PAPER (Special Section on Wave Technologies for Wireless and Optical Communications)
Category: Components and Devices
Keyword: 
software defined radiosix-port direct conversion receivernonlinearity calibration
 Summary | Full Text:PDF(440.7KB)

Experimental Study of Non-specular Wave Scattering from Building Surface Roughness for the Mobile Propagation Modeling
Hary BUDIARTO Kenshi HORIHATA Katsuyuki HANEDA Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 958-966
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
mobile propagationsurface roughnessnon-specular scatteringsignal processingESPRIT
 Summary | Full Text:PDF(823.7KB)

ACU and RSM Based Radio Spectrum Management for Realization of Flexible Software Defined Radio World
Kei SAKAGUCHI Chih FUNG LAM Tien Dzung DOAN Munkhtur TOGOOCH Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/12/01
Vol. E86-B  No. 12  pp. 3417-3424
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
software defined radio (SDR)spectrum managementautomatic calibration and certification unitradio security moduleGPS
 Summary | Full Text:PDF(517.2KB)

ICA Based Blind Source Separation Applied to Radio Surveillance
Edgar CARLOS Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/12/01
Vol. E86-B  No. 12  pp. 3491-3497
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio Technology and Its Applications)
Category: 
Keyword: 
HFarray antennaBSSULA
 Summary | Full Text:PDF(959.3KB)

Field Trial of a Space-Time Equalizer for TDMA Mobile Communications in a Suburban Micro-Cell Environment
Takeshi TODA Yuukichi AIHARA Yukiyoshi KAMIO Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/06/01
Vol. E86-B  No. 6  pp. 1954-1960
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
delay spreadenvelope cross-correlationinter-symbol interferencespace and path diversityspace-time equalizerTDMA mobile communications
 Summary | Full Text:PDF(1.3MB)

Impedance Characteristic Analysis of an Axial Slot Antenna on a Sectoral Cylindrical Cavity Excited by a Probe Using Method of Moments
Rangsan WONGSAN Chuwong PHONGCHAROENPANICH Monai KRAIRIKSH Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/06/01
Vol. E86-A  No. 6  pp. 1364-1373
Type of Manuscript:  Special Section PAPER (Special Section on Papers Selected from 2002 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2002))
Category: 
Keyword: 
sectoral cylindrical cavitydyadic green functionslot antennainput impedance
 Summary | Full Text:PDF(734.5KB)

A New Technique of Reduction of MEI Coefficient Computation Time for Scattering Problems
N. M. Alam CHOWDHURY Jun-ichi TAKADA Masanobu HIROSE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/04/01
Vol. E86-A  No. 4  pp. 950-953
Type of Manuscript:  LETTER
Category: Engineering Acoustics
Keyword: 
MEI techniquematrix localization techniqueSIE-MEI method
 Summary | Full Text:PDF(479KB)

Novel Formulation for the Scalar-Field Approach of IE-MEI Method to Solve the Three-Dimensional Scattering Problem
N. M. Alam CHOWDHURY Jun-ichi TAKADA Masanobu HIROSE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/08/01
Vol. E85-A  No. 8  pp. 1905-1912
Type of Manuscript:  PAPER
Category: Ultrasonics
Keyword: 
IE-MEISIE-MEIscalar reciprocity relation3D acoustic problemnumerical technique for 3D scattering problem
 Summary | Full Text:PDF(786.5KB)

Performance of MUSIC and ESPRIT for Joint Estimation of DOA and Angular Spread in Slow Fading Environment
Jung-Sik JEONG Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/05/01
Vol. E85-B  No. 5  pp. 972-977
Type of Manuscript:  Special Section LETTER (Wireless Communications Issue)
Category: 
Keyword: 
DOAangular spreadlocal scatteringMUSICESPRIT
 Summary | Full Text:PDF(326.8KB)

A Novel Architecture for MIMO Spatio-Temporal Channel Sounder
Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 436-441
Type of Manuscript:  Special Section PAPER (Special Issue on Signals, Systems and Electronics Technology)
Category: Digital Transmission
Keyword: 
mobile propagationchannel sounderMIMO channel responsechannel parameter estimationhardware implementation
 Summary | Full Text:PDF(435.1KB)

Optimal Signal Combining Based on DOA and Angular Spread Using Extended Array Mode Vector
Jung-Sik JEONG Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/11/01
Vol. E84-B  No. 11  pp. 3023-3032
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
DCMPzero-forcingsignal copyoptimal beamformingangular spread
 Summary | Full Text:PDF(561.3KB)

A Polarization Diversity PIFA on Portable Telephone and the Human Body Effects on Its Performance
Komsak MEKSAMOOT Monai KRAIRIKSH Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/09/01
Vol. E84-B  No. 9  pp. 2460-2467
Type of Manuscript:  Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Mobile Antennas
Keyword: 
polarization diversityPIFAmean effective gaincorrelation coefficientdiversity antenna gain
 Summary | Full Text:PDF(965.8KB)

Generalization of MUSIC Using Extended Array Mode Vector for Joint Estimation of Instantaneous DOA and Angular Spread
Jung-Sik JEONG Kei SAKAGUCHI Kiyomichi ARAKI Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/07/01
Vol. E84-B  No. 7  pp. 1781-1789
Type of Manuscript:  Special Section PAPER (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)
Category: Adaptive Algorithms and Experiments
Keyword: 
array mode vectorspatial signatureangular spreadDOAMUSIC
 Summary | Full Text:PDF(714.2KB)

A Ray-Tracing-Based Characterization and Verification of the Spatio-Temporal Channel Model for Future Wideband Wireless Systems
Houtao ZHU Jun-ichi TAKADA Kiyomichi ARAKI Takehiko KOBAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 644-652
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
channel modelingspatio-temporal channel modelray-tracingrandom-phase approach
 Summary | Full Text:PDF(1MB)

The Problem of the Fading Model Selection
Marcelo Agustin TANEDA Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/03/01
Vol. E84-B  No. 3  pp. 660-666
Type of Manuscript:  PAPER
Category: Sensing
Keyword: 
fading modelspropagation modelRayleighRiceNakagamiWeibullfading model selectionMDL principle
 Summary | Full Text:PDF(253.9KB)

An Optimization of Smoothing Preprocessing for Correlated Signal Parameter Estimation
Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/09/25
Vol. E83-B  No. 9  pp. 2117-2123
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
subspace-based superresolution algorithmcorrelated signalsmoothing preprocessingoptimizationsmoothed equivalent diversity profile
 Summary | Full Text:PDF(804.2KB)

Software Receiver Technology and Its Applications
Tokihiko YOKOI Yoshimitsu IKI Jun HORIKOSHI Katsuji MIWA Yoshio KARASAWA Akira FUKUDA Jun-ichi TAKADA Yuichi KURODA Takayasu SHIOKAWA Yukitsuna FURUYA Shigenari SUZUKI Yasuhiro SENBA Yoshihide YAMADA Hiroshi HARADA Yasuo SUZUKI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/06/25
Vol. E83-B  No. 6  pp. 1200-1209
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio and Its Technologies)
Category: 
Keyword: 
software receiversoftware radio
 Summary | Full Text:PDF(2.1MB)

A Model Order Estimation in the Matrix Pencil Method for the Transient Response of a Microwave Circuit Discontinuity
Manabu KITAMURA Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/11/25
Vol. E82-C  No. 11  pp. 2081-2086
Type of Manuscript:  PAPER
Category: Microwave and Millimeter Wave Technology
Keyword: 
FDTDMatrix-Pencil methodGPOFmicrostrip line discontinuitymodel order estimationMDL
 Summary | Full Text:PDF(684.9KB)

Investigations of Radiation Characteristics of a Circularly Polarized Conical Beam Spherical Slot Array Antenna
Chuwong PHONGCHAROENPANICH Monai KRAIRIKSH Jun-ichi TAKADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/07/25
Vol. E82-C  No. 7  pp. 1242-1247
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Phased Arrays and Antennas
Keyword: 
spherical slot array antennamobile satellite antennaconical beamcircular polarization
 Summary | Full Text:PDF(748.6KB)

On Applicability of the Integral Equation Formulation of the Measured Equation of Invariance to 2D Scattering Objects
Masanobu HIROSE Masayasu MIYAKE Jun-ichi TAKADA Ikuo ARAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/04/25
Vol. E82-B  No. 4  pp. 645-654
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
IE-MEI2D scattererinternal resonancecircular cylindersquare cylinder
 Summary | Full Text:PDF(516.1KB)

Influence of the Model Order Estimation Error in the ESPRIT Based High Resolution Techniques
Kei SAKAGUCHI Jun-ichi TAKADA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/03/25
Vol. E82-B  No. 3  pp. 561-563
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
TLS-ESPRIT algorithmmodel order estimation errormultipath parameter estimationoverestimation of the model order
 Summary | Full Text:PDF(206.4KB)

Aperture Illumination Control in Radial Line Slot Antennas
Masaharu TAKAHASHI Jun-ichi TAKADA Makoto ANDO Naohisa GOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/07/25
Vol. E76-B  No. 7  pp. 777-783
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
RLSAplanar antennaBSwave-guide arrayradial wave-guide
 Summary | Full Text:PDF(570.9KB)

An Equivalent Circuit of a Slot in Radial Line Slot Antennas
Jun-ichi TAKADA Makoto ANDO Naohisa GOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1991/09/25
Vol. E74-C  No. 9  pp. 2922-2928
Type of Manuscript:  Special Section PAPER (Special Issue on OFSET '90)
Category: Antenna
Keyword: 
 Summary | Full Text:PDF(450.3KB)

The Bandwidth and the Gain of Radial Line Slot Antennas with Uniform Slot Density
Jun-ichi TAKADA Makoto ANDO Naohisa GOTO 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/08/25
Vol. E73-E  No. 8  pp. 1372-1377
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
 Summary | Full Text:PDF(478KB)