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Paper Abstract and Keywords
Presentation 2007-11-01 15:40
A novel FFT-based Variable Channel and Bandwidth-TDMA scheme (VCB-TDMA) for Dynamic Spectrum Access Wireless Networks
Masahiro Umehira (Ibaraki Univ.), Koichi Ishihara, Yasushi Takatori (NTT) SAT2007-31
Abstract (in Japanese) (See Japanese page) 
(in English) Dynamic Spectrum Access has been drawing a significant deal of attention to improve frequency utilization efficiency since it enables to use the temporarily vacant frequency spectrum in terms of frequency domain and time domain. . This report proposes a new multiple access technique for Dynamic Spectrum Access, named FFT-based VCB-TDMA (Variable Channel and Bandwidth TDMA), which is expected to be used for future mobile satellite communications as well. This report describes the principle of the proposed FFT-based VCB-TDMA and points out that the inter-channel interference is resulted from not only the filter characteristics but also the discontinuity of adjacent channel signals for FFT processing. In addition, this report proposes the inter-channel interference reduction technique using guard time. The inter-channel interference reduction is confirmed by the computer simulation in AWGN environments.
Keyword (in Japanese) (See Japanese page) 
(in English) Dynamic Spectrum Access / FFT / VCS-TDMA / Inter-channel interference / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 299, SAT2007-31, pp. 71-75, Nov. 2007.
Paper # SAT2007-31 
Date of Issue 2007-10-25 (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 SAT2007-31

Conference Information
Committee SAT  
Conference Date 2007-11-01 - 2007-11-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawaken-Seinen-Kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communication Technology, etc. (JC-SAT2007) 
Paper Information
Registration To SAT 
Conference Code 2007-11-SAT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A novel FFT-based Variable Channel and Bandwidth-TDMA scheme (VCB-TDMA) for Dynamic Spectrum Access Wireless Networks 
Sub Title (in English)  
Keyword(1) Dynamic Spectrum Access  
Keyword(2) FFT  
Keyword(3) VCS-TDMA  
Keyword(4) Inter-channel interference  
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1st Author's Name Masahiro Umehira  
1st Author's Affiliation Ibaraki University (Ibaraki Univ.)
2nd Author's Name Koichi Ishihara  
2nd Author's Affiliation NTT (NTT)
3rd Author's Name Yasushi Takatori  
3rd Author's Affiliation NTT (NTT)
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Speaker Author-1 
Date Time 2007-11-01 15:40:00 
Presentation Time 20 minutes 
Registration for SAT 
Paper # SAT2007-31 
Volume (vol) vol.107 
Number (no) no.299 
Page pp.71-75 
#Pages 5 
Date of Issue 2007-10-25 (SAT) 

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