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Paper Abstract and Keywords
Presentation 2013-05-17 10:10
Benefits of Channel Diagonal Dominance to Cooperative MIMO Systems
Oussama Souihli, Yasuyuki Hatakawa, Satoshi Konishi (KDDI R&D Labs) RCS2013-31
Abstract (in Japanese) (See Japanese page) 
(in English) In cooperative multiple-input multiple-output (MIMO) cellular systems, a primary base station (BS), typically serving the cell to which the mobile station (MS) identifies, cooperates with K  1 secondary BSs, typically
serving neighboring cells, to efficiently transmit data to a given cell-edge MS. Because achieving the capacity of a general MIMO channel is contingent upon the availability of channel state information (CSI) at the transmitter(s), cooperative MIMO schemes in the literature require K + 1 CSI feedback transmissions from the receiver (one to each of the K + 1 BSs), a signaling overhead that has been argued to be too costly to be worthwhile . Contrarily in this work, we propose the first capacity-approaching cooperative MIMO scheme where the CSI feedback cost is as little as in a point-to-point scenario: Only 1 CSI feedback (that to the primary BS). The proposed scheme is motivated by the fact that if the MIMO channel matrix is diagonally-dominant, CSI-blind uniform-power transmission and receive-side zero-forcing are optimal [Ginis & Cioffi, 2002]. Precisely, in the proposed scheme all K secondary BSs send the
intended signal vector without precoding, whereas only the primary BS applies closed-loop MIMO precoding (such as beamforming) based on CSI (be it full or quantized (codebook-based)) fed back from the MS. Then, the primary BS applies a scaling factor to the precoded vector prior to transmission. This scalar is carefully designed such that the equivalent channel matrix at the receiver?s side is diagonally dominant with probability arbitrarily close to 1, irrespective of the instantaneous realizations of the channels relative to the secondary BSs. Owing to this diagonal dominance, it is shown that simple zero forcing at the receiver?s side suffices to achieve near-optimal signal detection. Even better, depending on the SNR regime, diagonal dominance need not be guaranteed all the time. The proposed cooperative MIMO scheme may find application in the 3GPP LTE-Advanced standard as a Coordinated Multi-Point (CoMP) transmission method.
Keyword (in Japanese) (See Japanese page) 
(in English) Wireless Communications / MIMO / Cooperative MIMO / CSI Feedback / Coordinated Multi-Point (CoMP) / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 37, RCS2013-31, pp. 49-54, May 2013.
Paper # RCS2013-31 
Date of Issue 2013-05-09 (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 RCS2013-31

Conference Information
Committee RCS IN  
Conference Date 2013-05-16 - 2013-05-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
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 2013-05-RCS-IN 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Benefits of Channel Diagonal Dominance to Cooperative MIMO Systems 
Sub Title (in English)  
Keyword(1) Wireless Communications  
Keyword(2) MIMO  
Keyword(3) Cooperative MIMO  
Keyword(4) CSI Feedback  
Keyword(5) Coordinated Multi-Point (CoMP)  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Oussama Souihli  
1st Author's Affiliation KDDI R&D Laboratories (KDDI R&D Labs)
2nd Author's Name Yasuyuki Hatakawa  
2nd Author's Affiliation KDDI R&D Laboratories (KDDI R&D Labs)
3rd Author's Name Satoshi Konishi  
3rd Author's Affiliation KDDI R&D Laboratories (KDDI R&D Labs)
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Speaker Author-1 
Date Time 2013-05-17 10:10:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2013-31 
Volume (vol) vol.113 
Number (no) no.37 
Page pp.49-54 
#Pages 6 
Date of Issue 2013-05-09 (RCS) 

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