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Paper Abstract and Keywords
Presentation 2007-08-24 09:40
Cognitive Radio System with Carrier Sense Assisted by Cellular System
Anwida Prompijit (Keio Univ.), Takeo Fujii (Univ. of Electro-Comm.), Shinichiro Haruyama, Masao Nakagawa (Keio Univ.) RCS2007-62
Abstract (in Japanese) (See Japanese page) 
(in English) Cognitive radio offers a tempting solution to increase the spectrum usage efficiency by proposing opportunistic usage of frequency bands among licensed users and secondary users. This paper focuses on mitigating the interference that may occur when the secondary user is unaware of the primary user痴 active period; known as hidden terminal problem. Path attenuation and shadowing effect are also considered. In this paper, in order to enhance the sensing capability of the cognitive radio system, we propose a cognitive radio system with the combination of active and passive awareness types, by the collaboration of carrier sense and cellular system. Here, we present the simulation results of the system with microwave relays as a primary user and ad hoc cognitive radio terminals as a secondary user. Three different cases are evaluated; the conventional system, the system with carrier sense, and the system with carrier sense assisted by cellular system.
Keyword (in Japanese) (See Japanese page) 
(in English) Cognitive Radio / Hidden Terminal Problem / Passive and Active Awareness Types / / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 192, RCS2007-62, pp. 51-56, Aug. 2007.
Paper # RCS2007-62 
Date of Issue 2007-08-16 (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)
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Conference Information
Committee RCS AN  
Conference Date 2007-08-23 - 2007-08-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Niigata University 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2007-08-RCS-AN 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Cognitive Radio System with Carrier Sense Assisted by Cellular System 
Sub Title (in English)  
Keyword(1) Cognitive Radio  
Keyword(2) Hidden Terminal Problem  
Keyword(3) Passive and Active Awareness Types  
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1st Author's Name Anwida Prompijit  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Takeo Fujii  
2nd Author's Affiliation The University of Electro-Communications (Univ. of Electro-Comm.)
3rd Author's Name Shinichiro Haruyama  
3rd Author's Affiliation Keio University (Keio Univ.)
4th Author's Name Masao Nakagawa  
4th Author's Affiliation Keio University (Keio Univ.)
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Speaker Author-1 
Date Time 2007-08-24 09:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2007-62 
Volume (vol) vol.107 
Number (no) no.192 
Page pp.51-56 
#Pages 6 
Date of Issue 2007-08-16 (RCS) 

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