Tetsuro IMAI


Path Loss Model Considering Blockage Effects of Traffic Signs Up to 40GHz in Urban Microcell Environments
Motoharu SASAKI Minoru INOMATA Wataru YAMADA Naoki KITA Takeshi ONIZAWA Masashi NAKATSUGAWA Koshiro KITAO Tetsuro IMAI 
Publication:   
Publication Date: 2018/08/01
Vol. E101-B  No. 8  pp. 1891-1902
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
5Gpropagationpath losshigh frequencyblockageurbanmicrocell
 Summary | Full Text:PDF(6MB)

Scattering Characteristics of the Human Body in 67-GHz Band
Ngochao TRAN Tetsuro IMAI Koshiro KITAO Yukihiko OKUMURA Takehiro NAKAMURA Hiroshi TOKUDA Takao MIYAKE Robin WANG Zhu WEN Hajime KITANO Roger NICHOLS 
Publication:   
Publication Date: 2018/06/01
Vol. E101-B  No. 6  pp. 1434-1442
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
5Gmillimeter wavesNLOS scenariosscattered waves by human bodiesradar cross section
 Summary | Full Text:PDF(4.4MB)

Frequency Dependency of Path Loss Between Different Floors in An Indoor Office Environment at UHF and SHF Bands
Motoharu SASAKI Minoru INOMATA Wataru YAMADA Naoki KITA Takeshi ONIZAWA Masashi NAKATSUGAWA Koshiro KITAO Tetsuro IMAI 
Publication:   
Publication Date: 2018/02/01
Vol. E101-B  No. 2  pp. 373-382
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2016)
Category: Propagation
Keyword: 
propagation5Gmillimeter waveUHFSHFhigh frequency bandsindoor officefloor penetration loss
 Summary | Full Text:PDF(8.2MB)

A Survey of Efficient Ray-Tracing Techniques for Mobile Radio Propagation Analysis
Tetsuro IMAI 
Publication:   
Publication Date: 2017/05/01
Vol. E100-B  No. 5  pp. 666-679
Type of Manuscript:  INVITED SURVEY PAPER
Category: Antennas and Propagation
Keyword: 
ray-tracingacceleration techniquehybrid modelmobile radio propagation
 Summary | Full Text:PDF(1.2MB)

Improving Accuracy of Ray-Tracing Prediction in Non Line-of-Sight (NLOS) Urban Street Cell Environment beyond 6GHz
Nobutaka OMAKI Tetsuro IMAI Koshiro KITAO Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/04/01
Vol. E100-B  No. 4  pp. 566-574
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
ray-tracing5G wireless network systemmicrocellular environmentSHFEHF
 Summary | Full Text:PDF(2.7MB)

Path Loss Model for Outdoor-to-Indoor Corridor Up to 40GHz Band in Microcell Environments
Minoru INOMATA Motoharu SASAKI Wataru YAMADA Takeshi ONIZAWA Masashi NAKATSUGAWA Nobutaka OMAKI Koshiro KITAO Tetsuro IMAI Yukihiko OKUMURA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 242-251
Type of Manuscript:  Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Realization of Next Generation Wireless Systems)
Category: 
Keyword: 
propagation5Goutdoor-to-indoor path loss modelmillimeter wavehigh frequency bandsmicrocell environments
 Summary | Full Text:PDF(2.7MB)

Cluster Power Variation Characteristics for 3GHz-Band MIMO Communication System in a Crowded Indoor Environment
Kentaro SAITO Tetsuro IMAI Koshiro KITAO Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/05/01
Vol. E99-B  No. 5  pp. 1131-1142
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMO channel modelcrowded environmenthuman body shadowingindoor environmentquasi-static environment
 Summary | Full Text:PDF(2.8MB)

Interference Reduction Characteristics by Circular Array Based Massive MIMO in a Real Microcell Environment
Ryochi KATAOKA Kentaro NISHIMORI Ngochao TRAN Tetsuro IMAI Hideo MAKINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/08/01
Vol. E98-B  No. 8  pp. 1447-1455
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part I: Radio Access Technologies and System Design)
Category: 
Keyword: 
massive MIMOcircular arraymicrocellmaximum ratio combiningzero forcingchannel sounder
 Summary | Full Text:PDF(4.8MB)

5G Radio Access: Requirements, Concept and Experimental Trials
Takehiro NAKAMURA Anass BENJEBBOUR Yoshihisa KISHIYAMA Satoshi SUYAMA Tetsuro IMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/08/01
Vol. E98-B  No. 8  pp. 1397-1406
Type of Manuscript:  INVITED PAPER (Special Section on 5G Radio Access Networks―Part I: Radio Access Technologies and System Design)
Category: 
Keyword: 
next generation mobile communications system5G4GLTELTE-advanced
 Summary | Full Text:PDF(3.6MB)

Model for Estimating Effects of Human Body Shadowing in High Frequency Bands
Ngochao TRAN Tetsuro IMAI Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/05/01
Vol. E98-B  No. 5  pp. 773-782
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Radio Propagation)
Category: 
Keyword: 
human body shadowinghigh frequency bandsKEUTD
 Summary | Full Text:PDF(2.6MB)

Experimental Study on Ray Based Spatio-Temporal Channel Characteristics in Indoor Environment
Koshiro KITAO Tetsuro IMAI Kentaro SAITO Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/05/01
Vol. E98-B  No. 5  pp. 798-805
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Radio Propagation)
Category: 
Keyword: 
indoor channel modelspatio - temporal channelvector channel sounder
 Summary | Full Text:PDF(2.3MB)

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)

Polarization Dispersion Characteristics of Propagation Paths in Urban Mobile Communication Environment
Tetsuro IMAI Koshiro KITAO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2380-2388
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Radio Propagation
Keyword: 
MIMOpolarizationpropagation modelmobile propagation
 Summary | Full Text:PDF(2.8MB)

Dynamic Channel Modeling Using Particle Filtering for Wireless MIMO Systems in Urban Environment
Kentaro SAITO Koshiro KITAO Tetsuro IMAI Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2372-2379
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Radio Propagation
Keyword: 
MIMOchannel modeltime-variant channelcluster-based channel modelparticle filter
 Summary | Full Text:PDF(3MB)

Interference Rejection Characteristics by Adaptive Array at User Equipment Using Measured K-Factor in Heterogeneous Networks
Kentaro NISHIMORI Keisuke KUSUMI Misaki HORIO Koshiro KITAO Tetsuro IMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1256-1264
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
heterogeneous networksadaptive arrayuser equipmentK-factorzero forcing
 Summary | Full Text:PDF(1.9MB)

Development and Experimental Evaluation of Cyclostationarity-Based Signal Identification Equipment for Cognitive Radios
Hiroki HARADA Hiromasa FUJII Shunji MIURA Hidetoshi KAYAMA Yoshiki OKANO Tetsuro IMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/04/01
Vol. E95-B  No. 4  pp. 1100-1108
Type of Manuscript:  Special Section PAPER (Special Section on Cognitive Radio and Heterogeneous Wireless Networks in Conjunction with Main Topics of CrownCom2011)
Category: 
Keyword: 
cognitive radiospectrum sharingcyclostationarity-based signal identificationtest bed experimentspatial channel emulator
 Summary | Full Text:PDF(2.3MB)

Evolution Trends of Wireless MIMO Channel Modeling towards IMT-Advanced
Chia-Chin CHONG Fujio WATANABE Koshiro KITAO Tetsuro IMAI Hiroshi INAMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/09/01
Vol. E92-B  No. 9  pp. 2773-2788
Type of Manuscript:  INVITED SURVEY PAPER
Category: 
Keyword: 
channel modelIMT-AdvancedMIMOmultipathspatial diversityspatial multiplexing
 Summary | Full Text:PDF(1.1MB)

Analysis of Incoming Wave Distribution in Vertical Plane in Urban Area and Evaluation of Base Station Antenna Effective Gain
Koshiro KITAO Tetsuro IMAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/06/01
Vol. E92-B  No. 6  pp. 2175-2181
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
mobile radiopower angle profileangle spreadmean angleantenna effective gain
 Summary | Full Text:PDF(1.3MB)

Analysis of Electromagnetic Wave Scattering by a Conducting Thin Plate and Image Coefficient for Ray Tracing Method
Kazunori UCHIDA Hiroshi MAEDA Tetsuro IMAI Teruya FUJII Masaharu HATA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/06/25
Vol. E81-C  No. 6  pp. 993-999
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
Wiener-Hopf techniquescatteringline sourceray tracing method
 Summary | Full Text:PDF(532.3KB)

Analysis of Plane Wave Scattering by a Conducting Thin Plate and a Criterion for Ray Tracing Method
Kazunori UCHIDA Tetsuro IMAI Teruya FUJII Masaharu HATA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/04/25
Vol. E81-C  No. 4  pp. 618-621
Type of Manuscript:  LETTER
Category: Electromagnetic Theory
Keyword: 
Wiener-Hopf techniquenear and far fieldsray tracing method
 Summary | Full Text:PDF(238.6KB)