Kazuki MARUTA


Massive Antenna Systems for Wireless Entrance (MAS-WE): Practical Application of Massive MIMO with Simplified Space Division Multiplexing Schemes
Kazuki MARUTA Atsushi OHTA Satoshi KUROSAKI Takuto ARAI Masataka IIZUKA 
Publication:   
Publication Date: 2017/05/01
Vol. E100-B  No. 5  pp. 779-787
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
Massive MIMOMultiuser MIMOinter-user interference cancellationschedulingspatial channel correlationsectorization
 Summary | Full Text:PDF(2.6MB)

Null-Space Expansion for Multiuser Massive MIMO Inter-User Interference Suppression in Time Varying Channels
Tatsuhiko IWAKUNI Kazuki MARUTA Atsushi OHTA Yushi SHIRATO Takuto ARAI Masataka IIZUKA 
Publication:   
Publication Date: 2017/05/01
Vol. E100-B  No. 5  pp. 865-873
Type of Manuscript:  PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
Keyword: 
inter-user interferencechannel time variationmultiuser MIMOmassive MIMOnull-space expansion
 Summary | Full Text:PDF(2.2MB)

Antenna Array Arrangement for Massive MIMO to Reduce Channel Spatial Correlation in LOS Environment
Takuto ARAI Atsushi OHTA Yushi SHIRATO Satoshi KUROSAKI Kazuki MARUTA Tatsuhiko IWAKUNI Masataka IIZUKA 
Publication:   
Publication Date: 2017/04/01
Vol. E100-B  No. 4  pp. 594-601
Type of Manuscript:  PAPER
Category: Wireless Communication Technologies
Keyword: 
massive MIMOmulti-user MIMOantenna arrangementline of sightspatial correlation
 Summary | Full Text:PDF(2.8MB)

Blind Interference Suppression Scheme by Eigenvector Beamspace CMA Adaptive Array with Subcarrier Transmission Power Assignment for Spectrum Superposing
Kazuki MARUTA Jun MASHINO Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/06/01
Vol. E98-B  No. 6  pp. 1050-1057
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
adaptive arraySubcarrier Transmission Power Assignment (STPA)blind algorithmEigenvector Beamspace Adaptive Array (EBAA)Constant Modulus Algorithm (CMA)spectrum superposing
 Summary | Full Text:PDF(2.9MB)

Spectral Efficiency Improvement of Fractional Frequency Reuse by Inter-Cell Interference Cancellation on Cooperative Base Station
Kazuki MARUTA Atsushi OHTA Masataka IIZUKA Takatoshi SUGIYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/06/01
Vol. E95-B  No. 6  pp. 2164-2168
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
inter-cell interference cancellationbase station cooperationfractional frequency reuse
 Summary | Full Text:PDF(1.2MB)

Data Transmission Using Original Coils in Resonant Wireless Power Transmission
Takashi MARUYAMA Tatsuya SHIMIZU Mamoru AKIMOTO Kazuki MARUTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/11/01
Vol. E94-B  No. 11  pp. 3172-3174
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
resonant wireless power transmissiondata transmissionload modulationequivalent circuit
 Summary | Full Text:PDF(463.1KB)