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Paper Abstract and Keywords
Presentation 2007-08-23 13:30
Throughput evaluation of CSMA and CDMA slotted ALOHA in Inter-Vehicle communication
Atsunori Sakata, Takaya Yamazato (Nagoya Univ.), Hiraku Okada (Niigata Univ.), Masaaki Katayama (Nagoya Univ.) RCS2007-55
Abstract (in Japanese) (See Japanese page) 
(in English) This paper evaluate the throughput performance of a carrier-sense multiple access (CSMA) scheme that uses an orthogonal frequency division multiple access (OFDM) physical layer and a CDMA slotted ALOHA scheme based on multicarrier CDMA (MC-CDMA) in inter-vehicle communication (IVC).
In particular, we compare the throughputs in a situation where a hidden terminal is no longer negligible. We encounter such a situation in an intersection where two or more cars are crossing by. In a hidden terminal situation, the CSMA scheme may degrade throughput. On the other hand, CDMA slotted ALOHA has a resistance to the hidden terminal situation as it can support simultaneous packets. However, the transmission data rate is much slow because of the spreading. Thus the total throughput may not be as high as the CSMA based OFDM even in a hidden terminal situation.

As results, we show that the CSMA based OFDM system shows better total throughput than CDMA slotted ALOHA in all region. But, only the signal from the nearest car can be received. On the contrary, CDMA slotted ALOHA can receive many packets simultaneously. This is much preferable feature for safety driving.
Keyword (in Japanese) (See Japanese page) 
(in English) Inter-vehicle communication / CSMA / hidden terminal problem / CDMA slotted ALOHA / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 192, RCS2007-55, pp. 13-17, Aug. 2007.
Paper # RCS2007-55 
Date of Issue 2007-08-16 (RCS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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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 Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Throughput evaluation of CSMA and CDMA slotted ALOHA in Inter-Vehicle communication 
Sub Title (in English)  
Keyword(1) Inter-vehicle communication  
Keyword(2) CSMA  
Keyword(3) hidden terminal problem  
Keyword(4) CDMA slotted ALOHA  
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1st Author's Name Atsunori Sakata  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Takaya Yamazato  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
3rd Author's Name Hiraku Okada  
3rd Author's Affiliation Nagoya University (Niigata Univ.)
4th Author's Name Masaaki Katayama  
4th Author's Affiliation Nagoya University (Nagoya Univ.)
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Speaker Author-1 
Date Time 2007-08-23 13:30:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2007-55 
Volume (vol) vol.107 
Number (no) no.192 
Page pp.13-17 
#Pages
Date of Issue 2007-08-16 (RCS) 


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