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Paper Abstract and Keywords
Presentation 2009-07-16 11:00
Cooperative Diversity Can Mitigate Keyhole Effects in Wireless MIMO Systems
Oussama Souihli, Tomoaki Ohtsuki (Keio Univ.) RCS2009-53
Abstract (in Japanese) (See Japanese page) 
(in English) A MIMO keyhole is a propagation environment such that the channel gain matrix has unit rank (single degree of freedom), irrespective of the number of deployed antennas or their correlations (spacing), thereby reducing the MIMO channel capacity to that of a SISO channel. Related literature seems to consider such degeneration hopeless. Contrary to this general belief, this paper demonstrates that cooperative diversity can mitigate keyhole effects. Precisely, provided that the source-relay channel is keyhole-free, we show that there exists a ``cutoff'' relay transmit power above which keyhole effects can be mitigated even when both the source-destination and the relay-destination channels incur keyhole effect. We explicit the closed form of this power threshold as function of the source transmit power and the channel matrices brought into play in the relay channel. Numerical examples confirm the relevance of our claim.
Keyword (in Japanese) (See Japanese page) 
(in English) MIMO / keyhole / Relay Networks / Cooperative Diversity / Rayleigh Fading / Information Theory / Shannon Capacity /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 130, RCS2009-53, pp. 1-6, July 2009.
Paper # RCS2009-53 
Date of Issue 2009-07-09 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 NS RCS  
Conference Date 2009-07-16 - 2009-07-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido University (Hokkaido) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Fixed/Wireless Network, Hand Over, Distributed MIMO, Mobile Ad-hoc Network 
Paper Information
Registration To RCS 
Conference Code 2009-07-NS-RCS 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Cooperative Diversity Can Mitigate Keyhole Effects in Wireless MIMO Systems 
Sub Title (in English)  
Keyword(1) MIMO  
Keyword(2) keyhole  
Keyword(3) Relay Networks  
Keyword(4) Cooperative Diversity  
Keyword(5) Rayleigh Fading  
Keyword(6) Information Theory  
Keyword(7) Shannon Capacity  
Keyword(8)  
1st Author's Name Oussama Souihli  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Tomoaki Ohtsuki  
2nd Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2009-07-16 11:00:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2009-53 
Volume (vol) vol.109 
Number (no) no.130 
Page pp.1-6 
#Pages
Date of Issue 2009-07-09 (RCS) 


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