Yukihiko OKUMURA


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)

Joint Processing of Analog Fixed Beamforming and CSI-Based Precoding for Super High Bit Rate Massive MIMO Transmission Using Higher Frequency Bands
Tatsunori OBARA Satoshi SUYAMA Jiyun SHEN Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/08/01
Vol. E98-B  No. 8  pp. 1474-1481
Type of Manuscript:  Special Section PAPER (Special Section on 5G Radio Access Networks―Part I: Radio Access Technologies and System Design)
Category: 
Keyword: 
5Ghigher frequency bandsMassive MIMOanalog fixed beamformingCSI-based precoding
 Summary | Full Text:PDF(1.6MB)

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)

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)

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)

Investigation of Inter-Cell Interference Coordination Applying Transmission Power Reduction in Heterogeneous Networks for LTE-Advanced Downlink
Akihito MORIMOTO Nobuhiko MIKI Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1327-1337
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
LTE-Advancedheterogeneous networkinter-cell interference coordinationcell range expansiontransmission power reduction
 Summary | Full Text:PDF(2.3MB)

Performance Evaluation of Interference Rejection Combining Receiver in Heterogeneous Networks for LTE-Advanced Downlink
Yusuke OHWATARI Akihito MORIMOTO Nobuhiko MIKI Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1265-1276
Type of Manuscript:  Special Section PAPER (Special Section on Heterogeneous Networks for Future Cellular Systems)
Category: 
Keyword: 
LTE-Advancedheterogeneous networkinterference rejection combininginter-cell interference
 Summary | Full Text:PDF(3.7MB)

Investigation on Transmission Power Control Suitable for Heterogeneous Network Employing Cell Range Expansion in LTE-Advanced Uplink
Akihito MORIMOTO Nobuhiko MIKI Hiroyuki ISHII Daisuke NISHIKAWA Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/04/01
Vol. E96-B  No. 4  pp. 1051-1060
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
LTE-advancedheterogeneous networktransmission power controlcell range expansion
 Summary | Full Text:PDF(3.2MB)

Impact on Inter-Cell Interference of Reference Signal for Interference Rejection Combining Receiver in LTE-Advanced Downlink
Yousuke SANO Yusuke OHWATARI Nobuhiko MIKI Yuta SAGAE Yukihiko OKUMURA Yasutaka OGAWA Takeo OHGANE Toshihiko NISHIMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/12/01
Vol. E95-B  No. 12  pp. 3728-3738
Type of Manuscript:  Special Section PAPER (Special Section on Coding and Coding Theory-Based Signal Processing for Wireless Communications)
Category: 
Keyword: 
LTE-Advancedinterference rejection combininginter-cell interferencereference signalturbo equalizer
 Summary | Full Text:PDF(3MB)

Link Performance Modeling of Interference Rejection Combining Receiver in System Level Evaluation for LTE-Advanced Downlink
Yousuke SANO Yusuke OHWATARI Nobuhiko MIKI Akihito MORIMOTO Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/12/01
Vol. E95-B  No. 12  pp. 3739-3751
Type of Manuscript:  Special Section PAPER (Special Section on Coding and Coding Theory-Based Signal Processing for Wireless Communications)
Category: 
Keyword: 
LTE-Advancedinterference rejection combininginter-cell interferencesystem level simulationlink performance modelingturbo equalizer
 Summary | Full Text:PDF(2.3MB)

Investigation on Data Signal Muting to Improve Channel Estimation Accuracy in Downlink Coordinated Multiple-Point Transmission in LTE-Advanced
Yusuke OHWATARI Nobuhiko MIKI Tetsushi ABE Satoshi NAGATA Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/12/01
Vol. E94-B  No. 12  pp. 3321-3334
Type of Manuscript:  Special Section PAPER (Special Section on Cooperative Communications for Cellular Networks)
Category: 
Keyword: 
coordinated multipoint transmission/receptiondata signal mutingLTE-Advanced
 Summary | Full Text:PDF(5.6MB)

Performance Investigation on Cell Selection Schemes Associated with Downlink Inter-Cell Interference Coordination in Heterogeneous Networks for LTE-Advanced
Yuya SAITO Jaturong SANGIAMWONG Nobuhiko MIKI Satoshi NAGATA Tetsushi ABE Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/12/01
Vol. E94-B  No. 12  pp. 3304-3311
Type of Manuscript:  Special Section PAPER (Special Section on Cooperative Communications for Cellular Networks)
Category: 
Keyword: 
LTE-advancedheterogeneous networkcell selectionreference signal received powerreference signal received quality
 Summary | Full Text:PDF(2.4MB)

1. 92 Mbps Data Transmission Experiments over a Coherent W-CDMA Radio Link
Koichi OKAWA Yukihiko OKUMURA Mamoru SAWAHASHI Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/07/25
Vol. E81-B  No. 7  pp. 1330-1336
Type of Manuscript:  Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
wideband CDMAmobile radioorthogonal multicode transmission
 Summary | Full Text:PDF(648.5KB)

Variable-Rate Data Transmission with Blind Rate Detection for Coherent DS-CDMA Mobile Radio
Yukihiko OKUMURA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/07/25
Vol. E81-B  No. 7  pp. 1365-1373
Type of Manuscript:  Special Section PAPER (Special Issue on Third Generation Land Mobile Communication Systems)
Category: 
Keyword: 
DS-CDMAvariable-rate transmissionblind rate detection
 Summary | Full Text:PDF(703.1KB)

Further Results on Field Experiments of Coherent Wideband DS-CDMA Mobile Radio
Tomohiro DOHI Yukihiko OKUMURA Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/06/25
Vol. E81-B  No. 6  pp. 1239-1247
Type of Manuscript:  PAPER
Category: Mobile Communication
Keyword: 
DS-CDMAmobile radioreverse linktransmit power controlantenna diversityRake combining
 Summary | Full Text:PDF(790.6KB)

Experiments on Coherent Multicode DS-CDMA
Tomohiro DOHI Yukihiko OKUMURA Akihiro HIGASHI Koji OHNO Fumiyuki ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/09/25
Vol. E79-B  No. 9  pp. 1326-1332
Type of Manuscript:  Special Section PAPER (Special Issue on Personal Communications)
Category: CDMA and multiple access technologies
Keyword: 
DS-CDMApilot symbol-aided coherent RAKEinterference power measurement based power controlorthogonal multicode transmissiontest-bedfield test
 Summary | Full Text:PDF(614.4KB)

Coherent Multicode DS-CDMA Mobile Radio Access
Fumyuki ADACHI Koji OHNO Akihiro HIGASHI Tomohiro DOHI Yukihiko OKUMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/09/25
Vol. E79-B  No. 9  pp. 1316-1325
Type of Manuscript:  Special Section PAPER (Special Issue on Personal Communications)
Category: CDMA and multiple access technologies
Keyword: 
DS-CDMAmobile raido accesscellular system
 Summary | Full Text:PDF(909.2KB)