Kei SAKAGUCHI


Optimal Design Method of MIMO Antenna Directivities and Corresponding Current Distributions by Using Spherical Mode Expansion
Maki ARAI Masashi IWABUCHI Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   
Publication Date: 2017/10/01
Vol. E100-B  No. 10  pp. 1891-1903
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMOantenna directivityantenna structurecurrent distributionspherical mode expansioncapacity maximization
 Summary | Full Text:PDF(2.3MB)

Where, When, and How mmWave is Used in 5G and Beyond
Kei SAKAGUCHI Thomas HAUSTEIN Sergio BARBAROSSA Emilio Calvanese STRINATI Antonio CLEMENTE Giuseppe DESTINO Aarno PÄRSSINEN Ilgyu KIM Heesang CHUNG Junhyeong KIM Wilhelm KEUSGEN Richard J. WEILER Koji TAKINAMI Elena CECI Ali SADRI Liang XIAN Alexander MALTSEV Gia Khanh TRAN Hiroaki OGAWA Kim MAHLER Robert W. HEATH Jr. 
Publication:   
Publication Date: 2017/10/01
Vol. E100-C  No. 10  pp. 790-808
Type of Manuscript:  INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
millimeter waveMEC28GHz60GHzmesh networkV2V/V2Xautomated drivingfuture forecast
 Summary | Full Text:PDF(5.3MB)

Design and Implementation of Lighting Control System Using Battery-Less Wireless Human Detection Sensor Networks
Tao YU Yusuke KUKI Gento MATSUSHITA Daiki MAEHARA Seiichi SAMPEI Kei SAKAGUCHI 
Publication:   
Publication Date: 2017/06/01
Vol. E100-B  No. 6  pp. 974-985
Type of Manuscript:  PAPER
Category: Network
Keyword: 
proof-of-conceptenergy savingLED light controlbattery-less wireless human detection sensor networkmulti-sensor user localization
 Summary | Full Text:PDF(7.1MB)

Practical Implementation of Spectrum Sensing and Signal Detection for Satellite Broadcasting Systems
Hiroyuki KAMATA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/08/01
Vol. E99-B  No. 8  pp. 1894-1901
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
signal detectionsatellite broadcastDVB-SDVB-S2cognitive radio
 Summary | Full Text:PDF(1.5MB)

Diamond Cellular Network —Optimal Combination of Small Power Basestations and CoMP Cellular Networks —
Hidekazu SHIMODAIRA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI Shinobu NANBA Satoshi KONISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/04/01
Vol. E99-B  No. 4  pp. 917-927
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
coordinated multi-point transmissionsmall power base stationdiamond cellular networkoptimal resource allocation
 Summary | Full Text:PDF(3MB)

Experimental Study on Battery-Less Sensor Network Activated by Multi-Point Wireless Energy Transmission
Daiki MAEHARA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/04/01
Vol. E99-B  No. 4  pp. 905-916
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless sensor networksmulti-point wireless energy transmissioncarrier shift diversityindoor environmentbattery-less sensorprototype hardwareexperimental validation
 Summary | Full Text:PDF(3MB)

Robust and Low Complexity Bandwidth and Carrier Frequency Estimation for Cognitive Radio
Hiroyuki KAMATA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/02/01
Vol. E99-B  No. 2  pp. 499-506
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
signal detectioncoarse bandwidth estimationcoarse carrier frequency estimationspectrum sensingcognitivecyclostationarity
 Summary | Full Text:PDF(1.7MB)

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)

Millimeter-Wave Wireless LAN and Its Extension toward 5G Heterogeneous Networks
Kei SAKAGUCHI Ehab Mahmoud MOHAMED Hideyuki KUSANO Makoto MIZUKAMI Shinichi MIYAMOTO Roya E. REZAGAH Koji TAKINAMI Kazuaki TAKAHASHI Naganori SHIRAKATA Hailan PENG Toshiaki YAMAMOTO Shinobu NANBA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/10/01
Vol. E98-B  No. 10  pp. 1932-1948
Type of Manuscript:  INVITED PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
millimeter waveIEEE802.11adcoordinated mmw WLAN5G cellular networksheterogeneous networks
 Summary | Full Text:PDF(5.7MB)

Millimeter-Wave Evolution for 5G Cellular Networks
Kei SAKAGUCHI Gia Khanh TRAN Hidekazu SHIMODAIRA Shinobu NANBA Toshiaki SAKURAI Koji TAKINAMI Isabelle SIAUD Emilio Calvanese STRINATI Antonio CAPONE Ingolf KARLS Reza AREFI Thomas HAUSTEIN 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/03/01
Vol. E98-B  No. 3  pp. 388-402
Type of Manuscript:  Special Section PAPER (Special Section on Position Papers Exploring Innovative Intelligence and Technologies in Communications)
Category: 
Keyword: 
millimeter-wave5G cellular networksmall cellC-RANsystem rate gain
 Summary | Full Text:PDF(3.7MB)

Large Scale Cooperation in Cellular Networks with Non-uniform User Distribution
Roya E. REZAGAH Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI Satoshi KONISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/11/01
Vol. E97-B  No. 11  pp. 2512-2523
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
large scale CoMPnon-uniform user distributiondynamic cell structuringC-RANsystem rate maximization
 Summary | Full Text:PDF(1.9MB)

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)

Experiments Validating the Effectiveness of Multi-Point Wireless Energy Transmission with Carrier Shift Diversity
Daiki MAEHARA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI Minoru FURUKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/09/01
Vol. E97-B  No. 9  pp. 1928-1937
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
wireless sensor networksmulti-point wireless energy transmissioncarrier shift diversityindoor environmentexperimental validation
 Summary | Full Text:PDF(3.2MB)

Optimization of Picocell Locations and Its Parameters in Heterogeneous Networks with Hotspots
Hidekazu SHIMODAIRA Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI Shoji KANEKO Noriaki MIYAZAKI Satoshi KONISHI Yoji KISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1338-1347
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
heterogeneous networkspicocellresource allocationcell associationpico BS locationoptimization problem
 Summary | Full Text:PDF(3MB)

An Efficient Relay Placement Method with Power Allocation for MIMO Two-Way Multi-Hop Networks
Gia Khanh TRAN Rindranirina RAMAMONJISON Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/05/01
Vol. E96-B  No. 5  pp. 1176-1186
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
multi-hoptwo-way relaynode placementpower allocationgeometric programmingconvex optimizationMIMOinterference cancellationSINR balancingQoS constrained optimization
 Summary | Full Text:PDF(2.1MB)

Distributed Power Control Network and Green Building Test-Bed for Demand Response in Smart Grid
Kei SAKAGUCHI Van Ky NGUYEN Yu TAO Gia Khanh TRAN Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/05/01
Vol. E96-A  No. 5  pp. 896-907
Type of Manuscript:  Special Section PAPER (Special Section on Networked Control Systems: Theories & Applications)
Category: 
Keyword: 
smart gridhierarchical power control networkdistributed control algorithmdemand responsecommunication latencyIEEE802.15.4g
 Summary | Full Text:PDF(4.7MB)

Performance Comparison between Open Loop and Closed Loop MIMO-OFDM Schemes Using Analytical Approach
Minjee KIM Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/11/01
Vol. E95-B  No. 11  pp. 3498-3508
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMO-OFDMCSIclosed loopopen loopSTBCInterleaverUE velocity
 Summary | Full Text:PDF(1.4MB)

Prototype Hardware for TDD Two-Way Multi-Hop Relay Network Using MIMO Network Coding
Keiichi MIZUTANI Takehiro MIYAMOTO Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/05/01
Vol. E95-B  No. 5  pp. 1738-1750
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
TDDMIMOtwo-way multi-hop relay networkMIMO network codingnetwork synchronizationprototype hardware950 MHz band
 Summary | Full Text:PDF(2.8MB)

Performance Analysis of MIMO Relay Network via Propagation Measurement in L-Shaped Corridor Environment
Namzilp LERTWIRAM Gia Khanh TRAN Keiichi MIZUTANI Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/04/01
Vol. E95-B  No. 4  pp. 1345-1356
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMO relay networkpropagation measurementtwo-way relaycooperative relayrelay location
 Summary | Full Text:PDF(2.9MB)

Study on Resource Optimization for Heterogeneous Networks
Gia Khanh TRAN Shinichi TAJIMA Rindranirina RAMAMONJISON Kei SAKAGUCHI Kiyomichi ARAKI Shoji KANEKO Noriaki MIYAZAKI Satoshi KONISHI Yoji KISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/04/01
Vol. E95-B  No. 4  pp. 1198-1207
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Heterogeneous Wireless Networks in Conjunction with Main Topics of CrownCom2011)
Category: 
Keyword: 
heterogeneous networkspectrum allocationpower allocationcell range expansionspectral efficiency
 Summary | Full Text:PDF(1.4MB)

Single Front-End MIMO Architecture with Parasitic Antenna Elements
Mitsuteru YOSHIDA Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/03/01
Vol. E95-B  No. 3  pp. 882-888
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
single front-end architectureparasitic antenna elementsMIMOequal gain combining
 Summary | Full Text:PDF(704.4KB)

Dynamic Fractional Base Station Cooperation Using Shared Distributed Remote Radio Units for Advanced Cellular Networks
Naoki KUSASHIMA Ian Dexter GARCIA Kei SAKAGUCHI Kiyomichi ARAKI Shoji KANEKO Yoji KISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/12/01
Vol. E94-B  No. 12  pp. 3259-3271
Type of Manuscript:  Special Section PAPER (Special Section on Cooperative Communications for Cellular Networks)
Category: 
Keyword: 
cellular networkMIMO transmissionfractional base station cooperationadaptive clusteringcoordinated scheduling
 Summary | Full Text:PDF(1.8MB)

The Gaussian MIMO Broadcast Channel under Receive Power Protection Constraints
Ian Dexter GARCIA Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3448-3460
Type of Manuscript:  Special Section PAPER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
MIMO systemsbroadcast channelscapacity regionprecodingLagrangian dualitydirty paper codingwireless distributed networkspectrum sharingcognitive radio
 Summary | Full Text:PDF(1.5MB)

Effect of Power Allocation Schemes on MIMO Two-Way Multi-Hop Network
Jonghyun LEE Gia Khanh TRAN Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3362-3370
Type of Manuscript:  Special Section PAPER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
MIMO two-way multi-hop networkpower allocationeigenvector based power allocation (EPA)optimal power allocation (OPA)distributed power allocation (DPA)
 Summary | Full Text:PDF(891.4KB)

Wireless Distributed Network: For Flexible Networking and Radio Resource Management
Seiichi SAMPEI Kei SAKAGUCHI Shinsuke IBI Koji YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3218-3227
Type of Manuscript:  INVITED PAPER (Special Section on Wireless Distributed Networks)
Category: 
Keyword: 
wireless distributed networkheterogeneous networkautonomous distributed networkscognitive radiocooperative transmissionradio resource management
 Summary | Full Text:PDF(1.3MB)

Performance Evaluation of Spatial Correlation Characteristics for Handset Antennas Using Spatial Fading Emulator Based on Clarke's Model
Hiroshi IWAI Kei SAKAGUCHI Tsutomu SAKATA Atsushi YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2514-2522
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Mobile Propagation
Keyword: 
spatial fading emulatorspatial correlation characteristicmulti-path propagation environmenthandset antennasscatterers
 Summary | Full Text:PDF(1.6MB)

Performance Analysis of MIMO Schemes in Residential Home Environment via Wideband MIMO Propagation Measurement
Gia Khanh TRAN Nguyen Dung DAO Kei SAKAGUCHI Kiyomichi ARAKI Hiroshi IWAI Tsutomu SAKATA Koichi OGAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/04/01
Vol. E93-A  No. 4  pp. 814-829
Type of Manuscript:  PAPER
Category: Communication Theory and Signals
Keyword: 
MIMO-OFDMwideband MIMO channel measurementresidential home environmentthroughput performance evaluation
 Summary | Full Text:PDF(7.2MB)

Topology Design and Performance Evaluation of Wireless Sensor Network Based on MIMO Channel Capacity
Ky LENG Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/01/01
Vol. E93-B  No. 1  pp. 22-28
Type of Manuscript:  PAPER
Category: Network
Keyword: 
WSNMIMO relay networktopology designrelay position
 Summary | Full Text:PDF(462.1KB)

STBC MIMO Network Coding for Bi-directional Multi-Hop Relay Networks
Fumie ONO Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3676-3682
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: MIMO Mesh Network
Keyword: 
multi-hop networkMIMOnetwork codingbi-directional relayspace time block code
 Summary | Full Text:PDF(676.1KB)

2D MIMO Network Coding with Inter-Route Interference Cancellation
Gia Khanh TRAN Kei SAKAGUCHI Fumie ONO Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3665-3675
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: MIMO Mesh Network
Keyword: 
MIMOmesh networknetwork codingcooperative beamforminginter-route interference cancellation
 Summary | Full Text:PDF(1.7MB)

Performance Evaluation of Wireless Sensor Network Based on MIMO Relaying Channel Capacity
KY LENG Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/10/01
Vol. E92-B  No. 10  pp. 3166-3173
Type of Manuscript:  PAPER
Category: Network
Keyword: 
WSNMIMO relay networkrelay positionAFDFspatial correlation
 Summary | Full Text:PDF(624.8KB)

MIMO Spatial Spectrum Sharing for High Efficiency Mesh Network
Fumie ONO Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/01/01
Vol. E91-B  No. 1  pp. 62-69
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Spectrum Sharing Technology)
Category: Spectrum Sharing
Keyword: 
mesh networkMIMOspatial spectrum sharingbi-directional link multiplexinginterference cancellation
 Summary | Full Text:PDF(567.2KB) | (Errata(VOL.E91-B,NO.2,2008))

Multi-Channel Multi-Stage Transmultiplexing Digital Down Converter and Its Application to RFID (ISO18000-3 mode 2) Reader/Writer
Yuichi NAKAGAWA Kei SAKAGUCHI Hideki KAWAMURA Kyoji OHASHI Masahiro MURAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/01/01
Vol. E91-B  No. 1  pp. 139-146
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Spectrum Sharing Technology)
Category: Enabling Technology
Keyword: 
multi-channel multi-stage transmultiplexing digital down convertersoftware defined radioRFIDISO18000-3 mode 2implementation on FPGA
 Summary | Full Text:PDF(1MB)

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)

3-D Angular Spectrum Measurements at 5 GHz in a Residential Two-Story House
Hiroshi IWAI Tsutomu SAKATA Atsushi YAMAMOTO Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2344-2351
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Propagation
Keyword: 
3-D angular spectrumresidential housepropagationMIMOchannel capacity
 Summary | Full Text:PDF(2MB)

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)

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)

MIMO Channel Capacity in an Indoor Line-Of-Sight (LOS) Environment
Kei SAKAGUCHI Hai-Yeow-Eugene CHUA Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/07/01
Vol. E88-B  No. 7  pp. 3010-3019
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMO channel capacityline-of-sight (LOS)antenna correlationRicean K factormeasurement experiment
 Summary | Full Text:PDF(629.5KB)

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)

Performance Analysis of MIMO Eigenmode Transmission System under Realistic Channel and System Conditions
Seeho TING Kei SAKAGUCHI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/08/01
Vol. E87-B  No. 8  pp. 2222-2232
Type of Manuscript:  PAPER
Category: Wireless Communication Technology
Keyword: 
MIMOeigenmode transmissionimperfect channel estimationdelayed quantized feedbackspatial correlationcontinuous fading channel
 Summary | Full Text:PDF(364.8KB)

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)

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)

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)

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
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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
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