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Paper Abstract and Keywords
Presentation 2010-03-04 09:00
User Selection Algorithm Considering Reliability of CSIT for MU-MIMO Systems Using Zero-Forcing Beamforming
Jun Yamabayashi, Chikara Ohta, Hisashi Tamaki (Kobe Univ.), Megumi Kaneko, Kazunori Hayashi (Kyoto Univ.) NS2009-171
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a user selection algorithm for multi-user multiple input multiple output (MU-MIMO) system using Zero-Forcing Beamforming (ZFBF). A base station (BS) employs the channel response between antennas of the BS and those of mobile stations (MS) for adjusting transmission weights. The BS gets the channel response by, for example, receiving feedbacks from MSs. Because the channel response varies over time, it involves the error margin and cannot be reliable as time passes by. When responses of channels with the error margin are used for selecting users and adjusting transmission weights by the BS, qualities of channels reduce as orthogonality of channels is lost and the interference between users increases. When MSs frequently give feedbacks of the channel response to the BS, the overhead in the uplink control increases. In this paper we proposed a user selection algorithm which employs a metric representing reliability of the channel response for balancing the sum rate capacity with the feedback frequency. The simulation results display that the proposed algorithm achieves larger sum rate capacity with lower feedback frequency than a conventional algorithm.
Keyword (in Japanese) (See Japanese page) 
(in English) MU-MIMO / user selection / feedback / reliability / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 448, NS2009-171, pp. 55-60, March 2010.
Paper # NS2009-171 
Date of Issue 2010-02-25 (NS) 
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)
Download PDF NS2009-171

Conference Information
Committee NS IN  
Conference Date 2010-03-04 - 2010-03-05 
Place (in Japanese) (See Japanese page) 
Place (in English) Miyazaki Phoenix Seagaia Resort (Miyazaki) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General, NS+IN workshop (March 4-5) 
Paper Information
Registration To NS 
Conference Code 2010-03-NS-IN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) User Selection Algorithm Considering Reliability of CSIT for MU-MIMO Systems Using Zero-Forcing Beamforming 
Sub Title (in English)  
Keyword(1) MU-MIMO  
Keyword(2) user selection  
Keyword(3) feedback  
Keyword(4) reliability  
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1st Author's Name Jun Yamabayashi  
1st Author's Affiliation Kobe University (Kobe Univ.)
2nd Author's Name Chikara Ohta  
2nd Author's Affiliation Kobe University (Kobe Univ.)
3rd Author's Name Hisashi Tamaki  
3rd Author's Affiliation Kobe University (Kobe Univ.)
4th Author's Name Megumi Kaneko  
4th Author's Affiliation Kyoto University (Kyoto Univ.)
5th Author's Name Kazunori Hayashi  
5th Author's Affiliation Kyoto University (Kyoto Univ.)
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Speaker Author-1 
Date Time 2010-03-04 09:00:00 
Presentation Time 20 minutes 
Registration for NS 
Paper # NS2009-171 
Volume (vol) vol.109 
Number (no) no.448 
Page pp.55-60 
#Pages 6 
Date of Issue 2010-02-25 (NS) 

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