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Paper Abstract and Keywords
Presentation 2009-11-26 09:20
Further Results on The MIMO Degraded Relay Channel Undergoing Keyhole Effects
Oussama Souihli, Tomoaki Ohtsuki (Keio Univ.) RCS2009-134
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. Contrarily to this general belief, in a previous work the authors demonstrated that cooperative diversity can mitigate keyhole effects. Precisely, the authors have provided a necessary and sufficient condition to mitigate the keyhole effect in wireless MIMO systems through cooperative diversity (relay deployment). Though the previous work efficiently mitigates the keyhole effect, it requires periodic update of the relay power level everytime the channel matrices change, which can be a hurdle in situations where channel state information (CSI) acquisition is difficult or unreliable.
Thus, the authors provide in this work a sufficient condition for keyhole effect mitigation in wireless MIMO systems that does not require any channel state information. By investigating the ergodic capacity of the MIMO degraded relay channel, we determine a power threshold for the relay average transmit power that ensures keyhole effect mitigation, and we explicit this power threshold in closed form. Simulation results demonstrate a striking similarity of the average constraint provided in this work with the instantaneous constraint provided in our previous work.
Keyword (in Japanese) (See Japanese page) 
(in English) Relay Networks / Cooperative Communications / MIMO Communications / Channel Capacity / Network Information Theory / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 305, RCS2009-134, pp. 7-12, Nov. 2009.
Paper # RCS2009-134 
Date of Issue 2009-11-19 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
Download PDF RCS2009-134

Conference Information
Committee RCS AP  
Conference Date 2009-11-26 - 2009-11-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Inst. of Tech. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Adaptive Antenna, Equalization, Interference Canceller, MIMO, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2009-11-RCS-AP 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Further Results on The MIMO Degraded Relay Channel Undergoing Keyhole Effects 
Sub Title (in English)  
Keyword(1) Relay Networks  
Keyword(2) Cooperative Communications  
Keyword(3) MIMO Communications  
Keyword(4) Channel Capacity  
Keyword(5) Network Information Theory  
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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Date Time 2009-11-26 09:20:00 
Presentation Time 20 
Registration for RCS 
Paper # IEICE-RCS2009-134 
Volume (vol) IEICE-109 
Number (no) no.305 
Page pp.7-12 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2009-11-19 

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