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Paper Abstract and Keywords
Presentation 2012-04-20 13:00
Investigation on Impact of Interference Rejection Combining Receiver Assuming Inter-cell Reference Signals Collision in LTE-Advanced
Yusuke Ohwatari, Nobuhiko Miki, Yuta Sagae, Yukihiko Okumura (NTT DOCOMO) RCS2012-15
Abstract (in Japanese) (See Japanese page) 
(in English) The interference rejection combining (IRC) receiver, which can suppress inter-cell interference, is effective in improving the cell edge user throughput. The IRC receiver is typically based on the minimum mean square error (MMSE) criteria, which requires highly accurate channel estimation and covariance matrix estimation that includes the inter-cell interference. As a covariance matrix estimation scheme, the downlink reference signals (RSs) based scheme was proposed. In this scheme, the covariance matrix only including the interference and noise can be estimated by subtracting the replica symbols of the serving cell from the received RS signals. When the transmission modes using the cell-specific RS (CRS) in LTE/LTE-Advanced are assumed, the property of the non-precoded CRS is different from that of the precoded data signals. From this different property, assuming the CRS-to-CRS collision among the serving and interfering cells, the covariance matrix estimation accuracy is affected. Therefore, this paper investigates this impact when both of closed and open-loop MIMO system in LTE/LTE-Advanced are assumed. The results of simulations assuming two transmitter and receiver antenna branches show that there is the impact of the CRS-to-CRS collision especially for the closed-loop MIMO system. However, the IRC receiver can improve the user throughput by exceeding 20% compared to that of the conventional maximal ratio combining (MRC) receiver under the simulation assumptions in this paper even when the CRS-to-CRS collision is assumed.
Keyword (in Japanese) (See Japanese page) 
(in English) LTE-Advanced / interference rejection combining / inter-cell interference / inter-cell reference signal collision / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 11, RCS2012-15, pp. 85-90, April 2012.
Paper # RCS2012-15 
Date of Issue 2012-04-12 (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 RCS2012-15

Conference Information
Committee RCS  
Conference Date 2012-04-19 - 2012-04-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyoto Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Radio Access Technologies, etc. 
Paper Information
Registration To RCS 
Conference Code 2012-04-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation on Impact of Interference Rejection Combining Receiver Assuming Inter-cell Reference Signals Collision in LTE-Advanced 
Sub Title (in English)  
Keyword(1) LTE-Advanced  
Keyword(2) interference rejection combining  
Keyword(3) inter-cell interference  
Keyword(4) inter-cell reference signal collision  
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1st Author's Name Yusuke Ohwatari  
1st Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
2nd Author's Name Nobuhiko Miki  
2nd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
3rd Author's Name Yuta Sagae  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Yukihiko Okumura  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
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Speaker Author-1 
Date Time 2012-04-20 13:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2012-15 
Volume (vol) vol.112 
Number (no) no.11 
Page pp.85-90 
#Pages 6 
Date of Issue 2012-04-12 (RCS) 

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