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Paper Abstract and Keywords
Presentation 2018-02-22 12:30
A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy
Yuki Nagashima, Toshiharu Kojima (UEC) SAT2017-59
Abstract (in Japanese) (See Japanese page) 
(in English) In helicopter satellite communications, the periodic channel blockage due to rotor blades is the most important problem to be solved.Code division multiplexing (CDM) employing Walsh-Hadamard code (WHCDM) is suitable for overcoming the periodic blockage.For the symbol synchronization in WHCDM systems, an initial acquisition scheme using the energy variance of the demultiplexed signal was proposed.However, the signal processing of this conventional scheme is rather complex.In this report, we propose an initial acquisition scheme in order to simplify the signal processing.The proposed scheme acquires the symbol timing using the asymmetry in the energy distribution of the demultiplexed signal.It requires significantly fewer multiplications than the conventional scheme.Results of computer simulation show that the acquisition performance of the proposed scheme is the same or slightly better than that of the conventional one.
It is therefore concluded that the proposed scheme drastically reduces the complexity without performance degradation.
Keyword (in Japanese) (See Japanese page) 
(in English) Helicopter Satellite Communications / Initial Acquisition / CDM / Walsh-Hadamard Code / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 446, SAT2017-59, pp. 19-24, Feb. 2018.
Paper # SAT2017-59 
Date of Issue 2018-02-15 (SAT) 
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 SAT2017-59

Conference Information
Committee SAT SANE  
Conference Date 2018-02-22 - 2018-02-23 
Place (in Japanese) (See Japanese page) 
Place (in English) The Yamaguchi Chamber of Commerce and Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Application and General 
Paper Information
Registration To SAT 
Conference Code 2018-02-SAT-SANE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Simplified Initial Acquisition Scheme for WHCDM Based on Distribution Asymmetry of Demultiplexed Signal Energy 
Sub Title (in English)  
Keyword(1) Helicopter Satellite Communications  
Keyword(2) Initial Acquisition  
Keyword(3) CDM  
Keyword(4) Walsh-Hadamard Code  
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1st Author's Name Yuki Nagashima  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Toshiharu Kojima  
2nd Author's Affiliation The University of Electro-Communications (UEC)
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Speaker Author-1 
Date Time 2018-02-22 12:30:00 
Presentation Time 25 minutes 
Registration for SAT 
Paper # SAT2017-59 
Volume (vol) vol.117 
Number (no) no.446 
Page pp.19-24 
#Pages 6 
Date of Issue 2018-02-15 (SAT) 

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