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Paper Abstract and Keywords
Presentation 2011-12-16 12:50
CDM Based Reference Signal Structure Using Oversampling for OFDM Downlink
Masahiro Tabata (Tokyo City Univ.), Teruo Kawamura (NTT DOCOMO), Hidekazu Taoka (DOCOMO Europe Labs.), Mamoru Sawahashi (Tokyo City Univ.) RCS2011-255
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes code division multiplexing (CDM) based reference signal (RS) multiplexing using oversampling for orthogonal frequency division multiplexing (OFDM) in the downlink. In the proposed RS multiplexing scheme, multiple transmission-stream-specific RSs are multiplexed using orthogonal CDM into the same original resource elements (REs) through oversampling of the fast Fourier transform (FFT) (or inverse fast Fourier transform (IFFT)). Hence, the required REs for the increased number of transmission streams, which correspond to the number of transmission antennas, can be reduced compared to that for the conventional RS multiplexing scheme that uses a combination of frequency division multiplexing (FDM) and time division multiplexing (TDM). Computer simulation results show that when the RSs for the third and fourth streams are multiplexed into the same REs as those for first and second streams using orthogonal CDM, the same block error rate performance is achieved as that for the RS multiplexing based on the Release 8 Long-Term Evolution (LTE) radio interface for 4-antenna space-frequency block code (SFBC) plus frequency switched transmit diversity (FSTD).
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communications / OFDM / Reference signal / Channel estimation / CDM / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 345, RCS2011-255, pp. 135-140, Dec. 2011.
Paper # RCS2011-255 
Date of Issue 2011-12-08 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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 RCS2011-255

Conference Information
Committee NS RCS  
Conference Date 2011-12-15 - 2011-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Yamaguchi University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Ad-hoc Network, Ubiquitous Network, Wireless Communication, security, Multi-Access Network 
Paper Information
Registration To RCS 
Conference Code 2011-12-NS-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) CDM Based Reference Signal Structure Using Oversampling for OFDM Downlink 
Sub Title (in English)  
Keyword(1) Mobile communications  
Keyword(2) OFDM  
Keyword(3) Reference signal  
Keyword(4) Channel estimation  
Keyword(5) CDM  
1st Author's Name Masahiro Tabata  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Teruo Kawamura  
2nd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
3rd Author's Name Hidekazu Taoka  
3rd Author's Affiliation DOCOMO Communications Laboratories Europe GmbH (DOCOMO Europe Labs.)
4th Author's Name Mamoru Sawahashi  
4th Author's Affiliation Tokyo City University (Tokyo City Univ.)
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Date Time 2011-12-16 12:50:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2011-255 
Volume (vol) IEICE-111 
Number (no) no.345 
Page pp.135-140 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2011-12-08 

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