"Doppo Sugimura,Maki Arai,Kei Sakaguchi,Kiyomichi Araki,Takayuki SOTOYAMA,Masayuki Hoshino","Optimization of Base Station Antenna Directivity for Base Station Cooperation Cellular Systems",,"信学技報",,,"  RCS2012-20",,2012,Apr.
"Hajime Nakamichi,Maki Arai,Kei Sakaguchi,Kiyomichi Araki,Takayuki SOTOYAMA,Masayuki Hoshino","Antenna Design for Multi-User MIMO to be Robust against Channel Feedback Error",,"信学技報,",,,"  A・P2011-199",,2012,Mar.
"Maki Arai,Kei Sakaguchi,Kiyomichi Araki,Yoshio Koyanagi,Takayuki SOTOYAMA","Optimization of MIMO Antenna Directivities and  Derivation of Current Distributions by Using Spherical Mode Expansion",,"IEICE Technical Report",,,"  A・P2011-99",,2011,Nov.
"Doppo Sugimura,Maki Arai,Kei Sakaguchi,Kiyomichi Araki,Takayuki SOTOYAMA","A Study on Beam Tilt Angle of Base Station Antennas for Base Station Cooperation Systems",,"IEEE PIMRC 2011",,,,,2011,Sept.
"Doppo Sugimura,Maki Arai,Kei Sakaguchi,Kiyomichi Araki,Takayuki SOTOYAMA","A Study on Vertical Pattern of Base Station Antennas for Base Station Cooperation System",,"IEICE Technical Report",,"  AP2010-182",,,2011,Mar.
"Maki ARAI,Kei SAKAGUCHI,Kiyomichi ARAKI,Takayuki SOTOYAMA","Derivation of analytical eigenvalues for basestation cooperation MIMO channel",,"IEICE Technical Report",,"Vol. 109","No. 218","p. 73-78",2009,Oct.