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Paper Abstract and Keywords
Presentation 2011-07-21 11:05
Investigation of Interference Rejection Combining Receiver to Suppress Inter-cell Interference in LTE-Advanced Downlink
Yusuke Ohwatari, Nobuhiko Miki, Takahiro Asai, Tetsushi Abe (NTT DOCOMO), Hidekazu Taoka (DOCOMO Euro Lab) RCS2011-80
Abstract (in Japanese) (See Japanese page) 
(in English) The interference rejection combining (IRC) receiver is effective in improving the cell-edge user throughput because it suppresses inter-cell interference. The IRC receiver is typically based on the minimum mean square error (MMSE) criteria, which requires channel estimation and covariance matrix estimation including the inter-cell interference with high accuracy. The paper investigates the gain from the IRC receiver taking into account the estimation of the interference signal, i.e., the covariance matrix, in terms of the downlink user throughput performance in a multi-cell environment. For the estimation of the covariance matrix, two estimation schemes are considered one based on data signals and the other based on the demodulation reference signal (DM-RS). The simulation results show that the IRC receiver employing the covariance matrix comprising the interference and noise component estimation improves the cell-edge user throughput (defined as the 5% value in the cumulative distribution function) by approximately 22% compared to the simplified MMSE receiver that approximates the inter-cell interference as AWGN when the inter-site distance is 500 m and the numbers of transmitter and receiver antennas are 2 and 2, respectively. It is also shown that the IRC receiver employing the full covariance matrix estimation degrades the average user throughput due to less accurate channel and covariance matrices.
Keyword (in Japanese) (See Japanese page) 
(in English) LTE-Advanced / interference rejection combining / inter-cell interference / covariance matrix estimation / / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 145, RCS2011-80, pp. 31-36, July 2011.
Paper # RCS2011-80 
Date of Issue 2011-07-14 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS NS  
Conference Date 2011-07-21 - 2011-07-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Asahikawa Civic Culture Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Fixed/Wireless Network, Hand Over, Relay, Distributed MIMO, Mobile Ad-hoc Network, etc. 
Paper Information
Registration To RCS 
Conference Code 2011-07-RCS-NS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of Interference Rejection Combining Receiver to Suppress Inter-cell Interference in LTE-Advanced Downlink 
Sub Title (in English)  
Keyword(1) LTE-Advanced  
Keyword(2) interference rejection combining  
Keyword(3) inter-cell interference  
Keyword(4) covariance matrix estimation  
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 Takahiro Asai  
3rd Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
4th Author's Name Tetsushi Abe  
4th Author's Affiliation NTT DOCOMO, INC. (NTT DOCOMO)
5th Author's Name Hidekazu Taoka  
5th Author's Affiliation DOCOMO Communications Laboratories Europe (DOCOMO Euro Lab)
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Date Time 2011-07-21 11:05:00 
Presentation Time 20 
Registration for RCS 
Paper # IEICE-RCS2011-80 
Volume (vol) IEICE-111 
Number (no) no.145 
Page pp.31-36 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2011-07-14 

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