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Paper Abstract and Keywords
Presentation 2012-05-18 12:50
MMSE Precoding using the Second-Order Statistics of Channels for Multiuser MIMO Communications
Masayuki Harada, Kazuhiko Fukawa, Hiroshi Suzuki, Satoshi Suyama (Tokyo Inst. of Tech.) RCS2012-38
Abstract (in Japanese) (See Japanese page) 
(in English) This report proposes a minimum mean-square error (MMSE) precoding method using the second-order statistics for multiuser MIMO mobile communications. In the multiuser MIMO, the MMSE precoding is one of the most promising techniques to suppress co-channel interference among users as major impairment. The MMSE precoding multiplies a transmitted signal vector by a modified pseudo-inverse of the channel matrix for suppressing the co-channel interference, and requires feedback of channel state information (CSI) in the case of frequency division duplex (FDD) systems. Conversely, the proposed MMSE precoding estimates the second-order statistics of the channels 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. Using the estimate of the autocorrelation matrix of the downlink, the proposed scheme controls directivity of transmit antennas so that the main beam and nulls can be turned toward desired and other user terminals, respectively. Under the condition of quasi-static frequency flat channels with three transmit antennas and two user terminals employing one receive antenna, computer simulations show that the proposed scheme, which does not need CSI feedback, is little inferior in BER performance to the conventional MMSE precoding that requires CSI feedback.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communication / multiuser MIMO / precoding / MMSE / second-order statistics / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 29, RCS2012-38, pp. 97-102, May 2012.
Paper # RCS2012-38 
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 RCS2012-38

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) MMSE Precoding using the Second-Order Statistics of Channels for Multiuser MIMO Communications 
Sub Title (in English)  
Keyword(1) Mobile communication  
Keyword(2) multiuser MIMO  
Keyword(3) precoding  
Keyword(4) MMSE  
Keyword(5) second-order statistics  
Keyword(6)  
Keyword(7)  
Keyword(8)  
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 12:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2012-38 
Volume (vol) vol.112 
Number (no) no.29 
Page pp.97-102 
#Pages 6 
Date of Issue 2012-05-10 (RCS) 

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