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Paper Abstract and Keywords
Presentation 2015-02-19 10:55
Interference reduction characteristics by circular array based massive MIMO in a real microcell environment
Ryochi Kataoka, Kentaro Nishimori (Niigata Univ.), Ngochao Tran, Tetsuro Imai (NTTdocomo)
Abstract (in Japanese) (See Japanese page) 
(in English) Massive MIMO enables the improvement on the transmission rate without increasing the burden on the signal processing by employing a large number of antennas at a base station. Even if the interference cancellation techniques are not utilized, the interference signal can be mitigated thanks to a high beam resolution by the massive MIMO transmission using linear or planar array antenna. The authors have evaluated the effect by the massive MIMO in small cell environment using 2GHz band. In this report, we employ quantitative evaluation on the interference rejection when using a cylindrical array antenna at base station. The real propagation channel was measured in small cell environment in an urban area. One desired user and one interference user in adjacent cell are assumed to be located. We evaluate the characteristics of the interference rejection versus the number of elements in the vertical and horizontal plane. It is shown that a sufficient interference reduction using a maximum ratio combining cannot be obtained when using the cylindrical array. Moreover, it is shown that selection on the valid antennas in the horizontal plane for further improvement of transmission quality.
Keyword (in Japanese) (See Japanese page) 
(in English) massive MIMO / microcell / cylindrical array antenna / maximum ratio combining / zero forcing / channel sounder / cumulative probability distribution /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 450, AP2014-189, pp. 15-20, Feb. 2015.
Paper # AP2014-189 
Date of Issue 2015-02-12 (AP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee AP  
Conference Date 2015-02-19 - 2015-02-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Chusho-kigyou center at Amagasaki-City 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation, Company special edition 
Paper Information
Registration To AP 
Conference Code 2015-02-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Interference reduction characteristics by circular array based massive MIMO in a real microcell environment 
Sub Title (in English)  
Keyword(1) massive MIMO  
Keyword(2) microcell  
Keyword(3) cylindrical array antenna  
Keyword(4) maximum ratio combining  
Keyword(5) zero forcing  
Keyword(6) channel sounder  
Keyword(7) cumulative probability distribution  
Keyword(8)  
1st Author's Name Ryochi Kataoka  
1st Author's Affiliation Niigata University (Niigata Univ.)
2nd Author's Name Kentaro Nishimori  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Ngochao Tran  
3rd Author's Affiliation NTTdocomo (NTTdocomo)
4th Author's Name Tetsuro Imai  
4th Author's Affiliation NTTdocomo (NTTdocomo)
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Speaker
Date Time 2015-02-19 10:55:00 
Presentation Time 25 
Registration for AP 
Paper # IEICE-AP2014-189 
Volume (vol) IEICE-114 
Number (no) no.450 
Page pp.15-20 
#Pages IEICE-6 
Date of Issue IEICE-AP-2015-02-12 


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