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Paper Abstract and Keywords
Presentation 2008-03-05 14:40
Throughput performance of random-access wireless system with pre-FFT type MMSE adaptive array antenna
Kazuto Yano, Ikuo Hiradate, Satoshi Tsukamoto, Makoto Taromaru (ATR) RCS2007-199
Abstract (in Japanese) (See Japanese page) 
(in English) Both increasing the chances of frame transmission by raising carrier sense level and the suppressing asynchronous interference signals are the requirements for a significant enhancement of the area-spectral efficiency of random-access wireless systems based on CSMA/CA. Recently, the authors have proposed a pre-FFT type MMSE adaptive array antenna with iterative weight update for OFDM systems in order to suppress asynchronous interference effectively. They have also constructed a multi-node link-level simulation tool based on the IEEE 802.11g ERP-OFDM system in order to evaluate the area-spectral efficiency of the random-access wireless system. It includes basic MAC layer processes of the DCF mode and a method of generating multipath channels among multiple nodes using 2-D raytracing simulations considering only transmission and reflection at walls. In this paper, the area-spectral efficiency enhancement of a random-access wireless system is evaluated through computer simulations assuming an indoor environment in which there is an LOS path only between nodes communicating each other. Simulation results show that a significant enhancement of the area-spectral efficiency can be achieved by disabling carrier sensing processes. It is also revealed that both a further enhancement of the area-spectral efficiency and an improvement of fairness can be brought by introducing the proposed adaptive array antenna to all nodes if a high transmission datarate is used.
Keyword (in Japanese) (See Japanese page) 
(in English) pre-FFT type adaptive array antenna / area-spectral efficiency / random access system / IEEE 802.11g / indoor environment / OFDM / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 518, RCS2007-199, pp. 79-84, March 2008.
Paper # RCS2007-199 
Date of Issue 2008-02-27 (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)
Download PDF RCS2007-199

Conference Information
Committee RCS AN MoNA SR WBS  
Conference Date 2008-03-05 - 2008-03-07 
Place (in Japanese) (See Japanese page) 
Place (in English) YRP 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2008-03-RCS-AN-MoMuC-SR-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Throughput performance of random-access wireless system with pre-FFT type MMSE adaptive array antenna 
Sub Title (in English)  
Keyword(1) pre-FFT type adaptive array antenna  
Keyword(2) area-spectral efficiency  
Keyword(3) random access system  
Keyword(4) IEEE 802.11g  
Keyword(5) indoor environment  
Keyword(6) OFDM  
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Keyword(8)  
1st Author's Name Kazuto Yano  
1st Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
2nd Author's Name Ikuo Hiradate  
2nd Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
3rd Author's Name Satoshi Tsukamoto  
3rd Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
4th Author's Name Makoto Taromaru  
4th Author's Affiliation Advanced Telecommunications Research Institute International (ATR)
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Speaker Author-1 
Date Time 2008-03-05 14:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2007-199 
Volume (vol) vol.107 
Number (no) no.518 
Page pp.79-84 
#Pages 6 
Date of Issue 2008-02-27 (RCS) 

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