Tomoki MURAKAMI


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(2.4MB)

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(2.6MB)

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(2MB)

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(2.6MB)

Implementation and Evaluation of Real-Time Distributed Zero-Forcing Beamforming for Downlink Multi-User MIMO Systems
Tomoki MURAKAMI Koichi ISHIHARA Riichi KUDO Yusuke ASAI Takeo ICHIKAWA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2521-2529
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Wireless Communication Technologies
Keyword: 
multiuser MIMOinter-cell interferencedistributed systemwireless LAN system
 Summary | Full Text:PDF(4.7MB)

Performance Evaluation of Interference-Aware Multi-Cell Beamforming for an Overlapping Cells Environment
Tomoki MURAKAMI Riichi KUDO Takeo ICHIKAWA Naoki HONMA Masato MIZOGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/06/01
Vol. E96-B  No. 6  pp. 1492-1501
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMOmulti-cell beamforminginter-cell interference (ICI)WLANdecentralized control scheme
 Summary | Full Text:PDF(4.2MB)