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Paper Abstract and Keywords
Presentation 2012-05-18 13:15
Channel Block Diagonalization using the Second-Order Statistics of Multiuser MIMO Communication Channels
Masayuki Harada, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama (Tokyo Inst. of Tech.) RCS2012-39
Abstract (in Japanese) (See Japanese page) 
(in English) This report proposes a block diagonalization (BD) method that does not require feedback of channel state information (CSI) by using the second-order statistics of the channel for multiuser MIMO mobile communications. In the multiuser MIMO, the BD precoding is one of the most promising techniques to suppress co-channel interference among users as major impairment. Using CSI, the BD precoding multiplies a transmitted signal vector by a precoding matrix so that the equivalent channel matrix can be block-diagonalized. Thus, the BD precoding requires feedback of CSI in the case of frequency division duplex (FDD) systems. Conversely, the proposed BD precoding estimates the second-order statistics of the channel from the average and covariance of incidence angles of propagation paths, and thus does not need CSI feedback. Specifically, on the assumption that an incidence angle distribution in the uplink channel is the same as that in the downlink channel, the proposed scheme estimates the autocorrelation matrix of the downlink from the average and covariance of incidence angles in the uplink. Since the proposed scheme uses the estimate of the autocorrelation matrix of the downlink, it performs eigenvalue decomposition of the estimated autocorrelation matrix whereas the conventional BD precoding performs singular value decomposition of the channel matrix. To verify the effectiveness of the proposed scheme, computer simulations are conducted. It is shown that the proposed scheme, which does not need CSI feedback, is little inferior in the channel capacity to the conventional BD precoding that requires CSI feedback.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communication / multiuser MIMO / precoding / block diagonalization / second-order statistics / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 29, RCS2012-39, pp. 103-108, May 2012.
Paper # RCS2012-39 
Date of Issue 2012-05-10 (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)
Download PDF RCS2012-39

Conference Information
Committee IN RCS  
Conference Date 2012-05-17 - 2012-05-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Kuramae-Kaikan, Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Internet, Multi-hop network, Mesh network, Network coding, Cross layer technique, Wireless communication, etc. 
Paper Information
Registration To RCS 
Conference Code 2012-05-IN-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Channel Block Diagonalization using the Second-Order Statistics of Multiuser MIMO Communication Channels 
Sub Title (in English)  
Keyword(1) Mobile communication  
Keyword(2) multiuser MIMO  
Keyword(3) precoding  
Keyword(4) block diagonalization  
Keyword(5) second-order statistics  
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Keyword(7)  
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1st Author's Name Masayuki Harada  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Kazuhiko Fukawa  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
3rd Author's Name Hiroshi Suzuki  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
4th Author's Name Satoshi Suyama  
4th Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Speaker Author-1 
Date Time 2012-05-18 13:15:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2012-39 
Volume (vol) vol.112 
Number (no) no.29 
Page pp.103-108 
#Pages 6 
Date of Issue 2012-05-10 (RCS) 

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