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Paper Abstract and Keywords
Presentation 2015-01-22 14:10
A throughput evaluation of an over-distributed antenna system with signal distributing or switching under control delay
Yuki Nakanishi, Toshihiko Nishimura, Takeo Ohgane, Yasutaka Ogawa (Hokkaido Univ.), Yusuke Ohwatari, Yoshihisa Kishiyama (NTT DOCOMO) SIP2014-91 RCS2014-279
Abstract (in Japanese) (See Japanese page) 
(in English) When a base station has many transmit antennas such as a massive MIMO system, we need as many pilot resources as the transmit antennas to estimate channel state information (CSI) and its feedback in an FDD system, and thus transmission efficiency degrades. In our previous study, we have proposed an over-distributed antenna system (O-DAS) with much more transmit antennas than limited pilot resources, and have shown an improvement of the peak throughput under a perfect CSI assumption. However, the CSI is outdated if control delay exists, and thus it may cause the inter-user-interference which seriously degrades the transmission performance. In this paper, we evaluate the throughput performance of the O-DAS for two transmission methods, namely, signal distributing and switching, in time-varying environments with a control delay. Compared with the case in non time-varying environments, it is shown that the performance degradation of signal switching is not serious and that the signal distributing still provides sufficient gain although the profitable range becomes narrow.
Keyword (in Japanese) (See Japanese page) 
(in English) distributed antenna system / multiuser MIMO / throughput / pilot sequence / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 395, RCS2014-279, pp. 61-66, Jan. 2015.
Paper # RCS2014-279 
Date of Issue 2015-01-15 (SIP, RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SIP RCS  
Conference Date 2015-01-22 - 2015-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Okayama Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing for Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2015-01-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A throughput evaluation of an over-distributed antenna system with signal distributing or switching under control delay 
Sub Title (in English)  
Keyword(1) distributed antenna system  
Keyword(2) multiuser MIMO  
Keyword(3) throughput  
Keyword(4) pilot sequence  
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1st Author's Name Yuki Nakanishi  
1st Author's Affiliation Hokkaido University (Hokkaido Univ.)
2nd Author's Name Toshihiko Nishimura  
2nd Author's Affiliation Hokkaido University (Hokkaido Univ.)
3rd Author's Name Takeo Ohgane  
3rd Author's Affiliation Hokkaido University (Hokkaido Univ.)
4th Author's Name Yasutaka Ogawa  
4th Author's Affiliation Hokkaido University (Hokkaido Univ.)
5th Author's Name Yusuke Ohwatari  
5th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
6th Author's Name Yoshihisa Kishiyama  
6th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2015-01-22 14:10:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # SIP2014-91, RCS2014-279 
Volume (vol) vol.114 
Number (no) no.394(SIP), no.395(RCS) 
Page pp.61-66 
#Pages 6 
Date of Issue 2015-01-15 (SIP, RCS) 

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