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Paper Abstract and Keywords
Presentation 2009-08-04 16:25
Performance Evaluation of Spreading Code Sequence Appropriate for Maximum Likelihood Detection in MC-CDMA with Channel Coding
Akira Wakamiya, Kenichi Higuchi (Tokyo Univ. of Sci.) RCS2009-107
Abstract (in Japanese) (See Japanese page) 
(in English) This paper investigates the spreading code sequences appropriate for the multicarrier code division multiple access (MC-CDMA) assuming the maximum likelihood detection (MLD) at the receiver. The conventional Walsh code sequence-based spreading code does not allow for exploitation of full diversity using MLD due to the zero product codeword distance. Therefore, we have proposed two spreading codes named a rotational Walsh code which is generated by applying phase rotation to the conventional Walsh code sequence and quadrature amplitude modulation (QAM) code whose constellation after spreading and code-multiplexing takes QAM-like shape. By designing the spreading code so that the minimum squared product codeword distance becomes larger than zero, these proposed codes achieve full frequency diversity. Without channel coding, we have shown that the rotational Walsh code achieves better bit error rate (BER) than the QAM code due to the larger minimum squared product codeword distance. However, we show in the paper that in channel coded case, the QAM code chieves better BER than the rotational Walsh code thanks to the larger average squared product codeword distance.
Keyword (in Japanese) (See Japanese page) 
(in English) MC-CDMA / Spreading code / Maximum likelihood detection / Diversity / Channel coding / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 164, RCS2009-107, pp. 171-176, Aug. 2009.
Paper # RCS2009-107 
Date of Issue 2009-07-27 (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 RCS2009-107

Conference Information
Committee RCS  
Conference Date 2009-08-03 - 2009-08-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Equalization, Multihop Systems, Resource Control, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2009-08-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance Evaluation of Spreading Code Sequence Appropriate for Maximum Likelihood Detection in MC-CDMA with Channel Coding 
Sub Title (in English)  
Keyword(1) MC-CDMA  
Keyword(2) Spreading code  
Keyword(3) Maximum likelihood detection  
Keyword(4) Diversity  
Keyword(5) Channel coding  
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1st Author's Name Akira Wakamiya  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Sci.)
2nd Author's Name Kenichi Higuchi  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Sci.)
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Speaker Author-1 
Date Time 2009-08-04 16:25:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2009-107 
Volume (vol) vol.109 
Number (no) no.164 
Page pp.171-176 
#Pages 6 
Date of Issue 2009-07-27 (RCS) 

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