Yasushi TAKATORI


Path Loss Model in Crowded Outdoor Environments Considering Multiple Human Body Shadowing of Multipath at 4.7GHz and 26.4GHz
Mitsuki NAKAMURA Motoharu SASAKI Wataru YAMADA Naoki KITA Takeshi ONIZAWA Yasushi TAKATORI Masashi NAKATSUGAWA Minoru INOMATA Koshiro KITAO Tetsuro IMAI 
Publication:   
Publication Date: 2019/08/01
Vol. E102-B  No. 8  pp. 1676-1688
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
path loss modelhuman body shadowinghuman blockagecrowded environment
 Summary | Full Text:PDF

Radio Propagation Prediction Method Using Point Cloud Data Based on Hybrid of Ray-Tracing and Effective Roughness Model in Urban Environments
Minoru INOMATA Tetsuro IMAI Koshiro KITAO Yukihiko OKUMURA Motoharu SASAKI Yasushi TAKATORI 
Publication:   
Publication Date: 2019/01/01
Vol. E102-B  No. 1  pp. 51-62
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
5G mobile communication systemhigh frequency bandsradio propagation prediction methodpoint cloud data
 Summary | Full Text:PDF

On the Feasibility of an Adaptive Movable Access Point System in a Static Indoor WLAN Environment
Tomoki MURAKAMI Shingo OKA Yasushi TAKATORI Masato MIZOGUCHI Fumiaki MAEHARA 
Publication:   
Publication Date: 2018/07/01
Vol. E101-B  No. 7  pp. 1693-1700
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
wireless local area network (WLAN) systemadaptive movable access point (AMAP) systemtraffic offloadk-means methodtime of arrival (ToA)receive signal strength indicator (RSSI)signal to interference and noise ratio (SINR)
 Summary | Full Text:PDF

Dynamic Group-Based Antenna Selection for Uplink Multi-User MIMO in Distributed Antenna System
Sho YOSHIDA Kentaro NISHIMORI Soichi ITO Tomoki MURAKAMI Koichi ISHIHARA Yasushi TAKATORI 
Publication:   
Publication Date: 2018/07/01
Vol. E101-B  No. 7  pp. 1552-1560
Type of Manuscript:  Special Section PAPER (Special Section on Communication Quality in Wireless Networks)
Category: 
Keyword: 
multi-user multiple-input multiple-output (MU-MIMO)distributed antenna system (DAS)antenna selectionray-tracing methodcable loss
 Summary | Full Text:PDF

CSI Feedback Reduction Method for Downlink Multiuser MIMO Transmission Using Dense Distributed Antenna Selection
Tomoki MURAKAMI Koichi ISHIHARA Yasushi TAKATORI Masato MIZOGUCHI Kentaro NISHIMORI 
Publication:   
Publication Date: 2018/02/01
Vol. E101-B  No. 2  pp. 426-433
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: MIMO
Keyword: 
multiuser multiple input multiple output (MU-MIMO)antenna selectionwireless LAN (WLAN)distributed antenna system (DAS)channel state information (CSI)
 Summary | Full Text:PDF

Throughput Improvement of Mobile Cooperative WLAN Systems with Identifying and Management of Starved APs/UEs for 5G
Akiyoshi INOKI Hirantha ABEYSEKERA Munehiro MATSUI Kenichi KAWAMURA Takeo ICHIKAWA Yasushi TAKATORI Masato MIZOGUCHI Akira KISHIDA Yoshifumi MORIHIRO Takahiro ASAI Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/08/01
Vol. E100-B  No. 8  pp. 1366-1376
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Technologies for 5G Mobile Communications System)
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
5Gwireless LANthroughput starvationCSMA/CA
 Summary | Full Text:PDF

User Equipment Centric Downlink Access in Unlicensed Spectrum for Heterogeneous Mobile Network
Riichi KUDO B. A. Hirantha Sithira ABEYSEKERA Yusuke ASAI Takeo ICHIKAWA Yasushi TAKATORI Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/10/01
Vol. E98-B  No. 10  pp. 1969-1977
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part II: Multi-RAT Heterogeneous Networks and Smart Radio Technologies)
Category: 
Keyword: 
heterogeneous networkCSMA/CAunlicensed spectrumwireless LANRXOPhidden terminal problem
 Summary | Full Text:PDF

Weighted-Combining Calibration on Multiuser MIMO Systems with Implicit Feedback
Hayato FUKUZONO Tomoki MURAKAMI Riichi KUDO Yasushi TAKATORI Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/04/01
Vol. E98-B  No. 4  pp. 701-713
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiple-input multiple-output (MIMO)channel reciprocityimplicit feedbackcalibrationminimum mean square error (MMSE)
 Summary | Full Text:PDF

A Band-Divided Receiver Prototype for Wideband Optical Signals
Munehiro MATSUI Riichi KUDO Yasushi TAKATORI Tadao NAKAGAWA Koichi ISHIHARA Masato MIZOGUCHI Takayuki KOBAYASHI Yutaka MIYAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/07/01
Vol. E94-B  No. 7  pp. 1801-1808
Type of Manuscript:  Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
coherent receiveranalog to digital converterOFDMreal-timeheterodyne receiver
 Summary | Full Text:PDF

A Stochastic Approach to Design MIMO Antenna with Parasitic Elements Based on Propagation Characteristics
Naoki HONMA Kentaro NISHIMORI Riichi KUDO Yasushi TAKATORI Takefumi HIRAGURI Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2578-2585
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
Keyword: 
MIMOparasitic antennasmobile antennasYagi-Uda arrays
 Summary | Full Text:PDF

1616 MIMO Testbed for MU-MIMO Downlink Transmission
Kentaro NISHIMORI Riichi KUDO Naoki HONMA Yasushi TAKATORI Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/02/01
Vol. E93-B  No. 2  pp. 345-352
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMOadaptive modulation schemeOFDMeigenvaluebit interleaver
 Summary | Full Text:PDF

Frequency-Domain Equalization for Coherent Optical Single-Carrier Transmission Systems
Koichi ISHIHARA Takayuki KOBAYASHI Riichi KUDO Yasushi TAKATORI Akihide SANO Yutaka MIYAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3736-3743
Type of Manuscript:  PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
frequency-domain equalization (FDE)coherent optical transmissionchromatic dispersion (CD)polarization mode dispersion (PMD)digital signal processing (DSP)
 Summary | Full Text:PDF

A Novel Dynamic Channel Access Scheme Using Overlap FFT Filter-Bank for Cognitive Radio
Motohiro TANABE Masahiro UMEHIRA Koichi ISHIHARA Yasushi TAKATORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3589-3596
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Spectrum Allocation
Keyword: 
dynamic spectrum accesschannel accessoverlap FFTfilter-bank
 Summary | Full Text:PDF

A New User Selection Measure in Block Diagonalization Algorithm for Multiuser MIMO Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/10/01
Vol. E92-B  No. 10  pp. 3206-3218
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMOuser selectionblock diagonalizationchannel capacity
 Summary | Full Text:PDF

Overlap Frequency-Domain Multiuser Detection for Asynchronous Uplink Multiuser MIMO-OFDM Systems
Koichi ISHIHARA Yasushi TAKATORI Kentaro NISHIMORI Kazuyasu OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/05/01
Vol. E92-B  No. 5  pp. 1582-1588
Type of Manuscript:  Special Section PAPER (Special Section on Radio Access Techniques for 3G Evolution)
Category: 
Keyword: 
multiuser MIMO (MU-MIMO)multiuser detection (MUD)OFDMuplinktiming offsetinter-block interference (IBI)
 Summary | Full Text:PDF

Antenna Selection Method for Terminal Antennas Employing Orthogonal Polarizations and Patterns in Outdoor Multiuser MIMO System
Naoki HONMA Riichi KUDO Kentaro NISHIMORI Yasushi TAKATORI Atsushi OHTA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1752-1759
Type of Manuscript:  Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation)
Category: Smart Antennas & MIMO
Keyword: 
MIMOmultiuserurban environmentpolarizationpatternantenna selection
 Summary | Full Text:PDF

New Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
Yasushi TAKATORI Riichi KUDO Atsushi OHTA Koichi ISHIHARA Kentaro NISHIMORI Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2312-2320
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Smart Antennas
Keyword: 
multiuser MIMOuplinkbeamformingfrequency offset
 Summary | Full Text:PDF

New Downlink Beamforming Method for Cooperative Multiple Access Point Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Atsushi OHTA Shuji KUBOTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2303-2311
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Smart Antennas
Keyword: 
MIMOdownlinkbeamformingmultiple access point system
 Summary | Full Text:PDF

Novel Downlink Beamforming Method Using Selective STBC with Common Eigenvectors for MIMO-OFDM Systems
Riichi KUDO Yasushi TAKATORI Kentaro NISHIMORI Koichi TSUNEKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/08/01
Vol. E89-B  No. 8  pp. 2170-2179
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
MIMOeigenvectorOFDMachievable spectrum efficiencySTBCbeamformingmaximum Doppler frequencyfeedback overhead
 Summary | Full Text:PDF

Frequency Correlation Characteristics Due to Antenna Configurations in Broadband MIMO Transmission
Kentaro NISHIMORI Nobuhiko TACHIKAWA Yasushi TAKATORI Riichi KUDO Koichi TSUNEKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Vol. E88-B  No. 6  pp. 2438-2445
Type of Manuscript:  Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
MIMOfrequency correlationantenna arrangementOFDMdelay signalsangular spread
 Summary | Full Text:PDF

A Novel Configuration for Realizing Automatic Calibration of Adaptive Array Using Dispersed SPDT Switches for TDD Systems
Kentaro NISHIMORI Keizo CHO Yasushi TAKATORI Toshikazu HORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/09/01
Vol. E84-B  No. 9  pp. 2516-2522
Type of Manuscript:  Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Adaptive Antennas
Keyword: 
adaptive arrayTDD systemsdispersed switchesautomatic calibration method
 Summary | Full Text:PDF

Adaptive Array for Reducing High-Power CCI on Asynchronous TDD Systems
Kentaro NISHIMORI Keizo CHO Yasushi TAKATORI Toshikazu HORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/07/01
Vol. E84-B  No. 7  pp. 1727-1734
Type of Manuscript:  Special Section PAPER (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)
Category: Adaptive Algorithms and Experiments
Keyword: 
adaptive arrayasynchronous TDD systemspower inversionMMSEguard time
 Summary | Full Text:PDF

Adaptive Array Employing Eigenvector Beam of Maximum Eigenvalue and Fractionally-Spaced TDL with Real Tap
Yasushi TAKATORI Keizo CHO Kentaro NISHIMORI Toshikazu HORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1678-1687
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
adaptive arraydigital beamformingeigenvector beamhigh-speed wireless accessfractionally-spaced-tapped-delay-line
 Summary | Full Text:PDF

Two Base Station Configuration Using an Adaptive Array at Elevated Locations for Microcell Systems
Kentaro NISHIMORI Keizo CHO Yasushi TAKATORI Toshikazu HORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1688-1696
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
adaptive arrayelevated base stationco-channel interferencemicrocellelement spacing
 Summary | Full Text:PDF