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Paper Abstract and Keywords
Presentation 2009-01-22 15:35
Study of Multiuser Interference Canceller for Asynchronous OFDMA
Yosuke Harada, Hisato Iwai, Hideichi Sasaoka (Doshisha Univ.) SIP2008-139 RCS2008-187
Abstract (in Japanese) (See Japanese page) 
(in English) In uplink OFDMA systems, the signals transmitted by users at different distance from the base station are received with different time delays. As a result, the transmission performance deteriorates due to the inter-subcarrier interference caused by the delay. In order to solve the problem, we have proposed a multi-user interference canceller based on the principal of the OFDM delay wave canceller and examined the performance of the proposed system in an asynchronous 2 user uplink OFDMA system. From the quantitative analysis by computer simulations, it is indicated that the proposed canceller prevents from the degradation of the transmission performance by multi-user interference. But the performance in a larger user environment has not been made clear. Moreover technical issue remains in that, when the decision symbols have some errors, the interference is not removed effectively. In this paper, we firstly evaluate the performance of the proposed canceller in a multi-user environment more than 2. In addition, the multi-stage canceller is proposed to enhance the performance.
Keyword (in Japanese) (See Japanese page) 
(in English) Uplink / Symbol-by-symbol demodulation / Decision feedback canceller / Asynchronous OFDMA / Multi-stage canceller / / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 391, RCS2008-187, pp. 89-94, Jan. 2009.
Paper # RCS2008-187 
Date of Issue 2009-01-15 (SIP, 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)
Download PDF SIP2008-139 RCS2008-187

Conference Information
Committee SIP RCS  
Conference Date 2009-01-22 - 2009-01-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Kumamoto University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2009-01-SIP-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study of Multiuser Interference Canceller for Asynchronous OFDMA 
Sub Title (in English)  
Keyword(1) Uplink  
Keyword(2) Symbol-by-symbol demodulation  
Keyword(3) Decision feedback canceller  
Keyword(4) Asynchronous OFDMA  
Keyword(5) Multi-stage canceller  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yosuke Harada  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Hisato Iwai  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Hideichi Sasaoka  
3rd Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2009-01-22 15:35:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # SIP2008-139, RCS2008-187 
Volume (vol) vol.108 
Number (no) no.390(SIP), no.391(RCS) 
Page pp.89-94 
#Pages 6 
Date of Issue 2009-01-15 (SIP, RCS) 

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