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Paper Abstract and Keywords
Presentation 2018-03-09 13:55
Influence of Channel Estimation Error on Noise Enhancement Suppression by Using Novel Multilevel Spreading Codes
Tatsuya Motoki, Takehiko Kobayashi (Tokyo Denki Univ.) IT2017-146 ISEC2017-134 WBS2017-127
Abstract (in Japanese) (See Japanese page) 
(in English) Zero-forcing frequency-domain equalization (ZF-FDE) has been used to combat frequency selective fading caused by multipath propagation. The ZF-FDE is effective when the matrix representing the propagation channel is well-conditioned; when ill-conditioned, however, it causes noise enhancement and, as a result, deteriorates the transmission performance. We have recently proposed a new system and a new multilevel spreading code to suppress the noise enhancement. The proposed system regards the spreading code matrix as multiple-input multiple-output (MIMO) propagation channel and performs the ZF-FDE, multiplying the channel matrix by the spreading code matrix. The proposed system was once evaluated on an assumption of no error in estimating the channel matrix. If the channel estimation error is present, the proposed system quality deteriorates. In this paper, we investigate the influence of channel estimation error on the bit error rate of the proposed system by computer simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) DS-CDMA / ZF-FDE / multilevel code / noise enhancement / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 489, WBS2017-127, pp. 259-264, March 2018.
Paper # WBS2017-127 
Date of Issue 2018-03-01 (IT, ISEC, WBS) 
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 IT2017-146 ISEC2017-134 WBS2017-127

Conference Information
Committee WBS IT ISEC  
Conference Date 2018-03-08 - 2018-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) Katsusika Campas, Tokyo University of Science 
Topics (in Japanese) (See Japanese page) 
Topics (in English) joint meeting of IT, ISEC, and WBS 
Paper Information
Registration To WBS 
Conference Code 2018-03-WBS-IT-ISEC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Influence of Channel Estimation Error on Noise Enhancement Suppression by Using Novel Multilevel Spreading Codes 
Sub Title (in English)  
Keyword(1) DS-CDMA  
Keyword(2) ZF-FDE  
Keyword(3) multilevel code  
Keyword(4) noise enhancement  
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1st Author's Name Tatsuya Motoki  
1st Author's Affiliation Tokyo Denki University (Tokyo Denki Univ.)
2nd Author's Name Takehiko Kobayashi  
2nd Author's Affiliation Tokyo Denki University (Tokyo Denki Univ.)
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Speaker Author-1 
Date Time 2018-03-09 13:55:00 
Presentation Time 25 minutes 
Registration for WBS 
Paper # IT2017-146, ISEC2017-134, WBS2017-127 
Volume (vol) vol.117 
Number (no) no.487(IT), no.488(ISEC), no.489(WBS) 
Page pp.259-264 
#Pages 6 
Date of Issue 2018-03-01 (IT, ISEC, WBS) 

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