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Paper Abstract and Keywords
Presentation 2008-01-24 12:50
RLS-based Channel Estimation for DS-CDMA Frequency-domain Equalization
Yohei Kojima, Kazuaki Takeda, Fumiyuki Adachi (Tohoku Univ.) SIP2007-142 RCS2007-145
Abstract (in Japanese) (See Japanese page) 
(in English) Since the frequency spectrum of the pilot chip sequence is not constant, the channel estimation accuracy degrades. Recently, we proposed a pilot-assisted channel estimation based on the minimum mean square error (MMSE) criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good bit error rate (BER) performance is achieved. We also proposed a 2-step maximum likelihood channel estimation (MLCE) to further improve the estimation accuracy. However, the tracking ability is a problem in 2-step MLCE. In this paper, we propose a one-tap RLS-based channel estimation scheme for direct sequence code division multiple access (DS-CDMA) with frequency-domain equalization (FDE). We evaluate the BER performance of DS-CDMA using one-tap RLS-based channel estimation in a frequency selective Rayleigh fading channel by computer simulation. The BER performance using one-tap RLS-based channel estimation is compared with that using 2-step MLCE and channel estimation with interpolation.
Keyword (in Japanese) (See Japanese page) 
(in English) DS-CDMA / frequency-domain equalization / MMSE / channel estimation / RLS algorithm / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 440, RCS2007-145, pp. 67-72, Jan. 2008.
Paper # RCS2007-145 
Date of Issue 2008-01-17 (SIP, 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 SIP2007-142 RCS2007-145

Conference Information
Committee RCS SIP  
Conference Date 2008-01-24 - 2008-01-25 
Place (in Japanese) (See Japanese page) 
Place (in English) Hiroshima City Uni. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2008-01-RCS-SIP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) RLS-based Channel Estimation for DS-CDMA Frequency-domain Equalization 
Sub Title (in English)  
Keyword(1) DS-CDMA  
Keyword(2) frequency-domain equalization  
Keyword(3) MMSE  
Keyword(4) channel estimation  
Keyword(5) RLS algorithm  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Yohei Kojima  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Kazuaki Takeda  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Fumiyuki Adachi  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2008-01-24 12:50:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # SIP2007-142, RCS2007-145 
Volume (vol) vol.107 
Number (no) no.438(SIP), no.440(RCS) 
Page pp.67-72 
#Pages 6 
Date of Issue 2008-01-17 (SIP, RCS) 

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