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 selection, ray-tracing method, cable loss, 
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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) system, adaptive movable access point (AMAP) system, traffic offload, k-means method, time of arrival (ToA), receive signal strength indicator (RSSI), signal to interference and noise ratio (SINR), 
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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 selection, wireless LAN (WLAN), distributed antenna system (DAS), channel state information (CSI), 
 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 reciprocity, implicit feedback, calibration, minimum mean square error (MMSE), 
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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 MIMO, inter-cell interference, distributed system, wireless LAN system, 
 Summary | Full Text:PDF
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: 
MIMO, multi-cell beamforming, inter-cell interference (ICI), WLAN, decentralized control scheme, 
 Summary | Full Text:PDF