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Paper Abstract and Keywords
Presentation 2009-08-04 10:55
A Study on Frequency Diversity and Multi-User Diversity in IFDMA
Yuichi Kazama, Akira Yamasaki, Koichi Adachi, Masao Nakagawa (Keio Univ.) RCS2009-97
Abstract (in Japanese) (See Japanese page) 
(in English) Single-carrier frequency division multiple access (SC-FDMA) has been decided to be adopted in the uplink of the future wireless communication system. Interleaved frequency division multiple access (IFDMA), whose transmitted signal is generated in the time domain, is a special case of SC-FDMA. The number of comb like spectrum and the spectral interval between each spectrum depend on the number of transmission data symbols Q in one IFDMA block and repetition number L. In the case of large Q and small L, large frequency diversity gain can be obtained due to the number of spectrum increases. However, inter-chip interference (ICI) owing to the multipaths environment is increased. In the multi-user environment, it is difficult to get multi-user diversity due to the decrease of the degree of freedom for channel allocation to each user. On the other hand, in the case of small Q and large L, frequency diversity gain obtained becomes smaller, and ICI is decreased. Furthermore, multi-user diversity can be obtained due to the increase of the degree of the freedom for channel allocation. Thus, in this paper, we derive average bit error rate (BER) performance of IFDMA in the multi-user environment theoretically by taking into account of frequency diversity, multi-user diversity and ICI when Q and L are changed and then average BER performance of IFDMA is compared to that of OFDM. In addition, the validity of the theoretical analysis is confirmed by computer simulation.
Keyword (in Japanese) (See Japanese page) 
(in English) IFDMA / Frequency diversity / Multi-user diversity / ICI / / / /  
Reference Info. IEICE Tech. Rep., vol. 109, no. 164, RCS2009-97, pp. 115-120, Aug. 2009.
Paper # RCS2009-97 
Date of Issue 2009-07-27 (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)
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Conference Information
Committee RCS  
Conference Date 2009-08-03 - 2009-08-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Equalization, Multihop Systems, Resource Control, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2009-08-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Frequency Diversity and Multi-User Diversity in IFDMA 
Sub Title (in English)  
Keyword(1) IFDMA  
Keyword(2) Frequency diversity  
Keyword(3) Multi-user diversity  
Keyword(4) ICI  
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1st Author's Name Yuichi Kazama  
1st Author's Affiliation Keio University (Keio Univ.)
2nd Author's Name Akira Yamasaki  
2nd Author's Affiliation Keio University (Keio Univ.)
3rd Author's Name Koichi Adachi  
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 2009-08-04 10:55:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2009-97 
Volume (vol) vol.109 
Number (no) no.164 
Page pp.115-120 
#Pages 6 
Date of Issue 2009-07-27 (RCS) 

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