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Paper Abstract and Keywords
Presentation 2012-12-14 09:40
Performance of Decision-Feedback Channel Estimation for TDM Based Control Signals in OFDMA Downlink
Shunsuke Okaniwa (Tokyo City Univ.), Nobuhiko Miki, Teruo Kawamura (NTT DOCOMO), Mamoru Sawahashi (Tokyo City Univ.) RCS2012-211
Abstract (in Japanese) (See Japanese page) 
(in English) In orthogonal frequency division multiple access (OFDMA), time division multiplexing (TDM) based layer 1 (L1) /layer 2 (L2) control signals provide advantageous features such as a power saving effect using micro-sleep operation and a short round trip delay (RTD) for channel-dependent scheduling and adaptive modulation and coding (AMC) compared to a frequency division multiplexing (FDM) based structure. However, only a portion of the reference signal (RS) symbols is used for channel estimation assuming staggered RS multiplexing in order to obtain the merits of the TDM based control signals. Hence, this paper presents decision-feedback channel estimation (DFCE) methods using soft-symbol estimation for control signals for the TDM based control signals in the OFDMA downlink. In the proposed DFCE methods, channel estimation accuracy is improved by using soft-symbol estimation of the control signals based on the extrinsic log-likelihood ratio (LLR) at the soft output Viterbi algorithm (SOVA) for convolutional coding in addition to the RS symbols. Computer simulation results show that the required average received signal-to-noise power ratio (SNR) satisfying the average block error rate (BLER) of 10-2 using DFCE in the subframe of interest is decreased by approximately 0.6 dB compared to that for RS based channel estimation. Hence, we conclude that DFCE with soft-symbol estimation is very effective in improving the channel estimation accuracy using a limited number of RS symbols over the duration in which TDM based control signals are multiplexed, while maintaining the merits such as an efficient power saving effect using micro-sleep operation and a short processing delay.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDMA / control signal / channel estimation / decision-feedback channel estimation / / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 351, RCS2012-211, pp. 167-172, Dec. 2012.
Paper # RCS2012-211 
Date of Issue 2012-12-06 (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 NS RCS  
Conference Date 2012-12-13 - 2012-12-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime Univ. 
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 2012-12-NS-RCS 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance of Decision-Feedback Channel Estimation for TDM Based Control Signals in OFDMA Downlink 
Sub Title (in English)  
Keyword(1) OFDMA  
Keyword(2) control signal  
Keyword(3) channel estimation  
Keyword(4) decision-feedback channel estimation  
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1st Author's Name Shunsuke Okaniwa  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Nobuhiko Miki  
2nd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
3rd Author's Name Teruo Kawamura  
3rd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
4th Author's Name Mamoru Sawahashi  
4th Author's Affiliation Tokyo City University (Tokyo City Univ.)
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Speaker Author-1 
Date Time 2012-12-14 09:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2012-211 
Volume (vol) vol.112 
Number (no) no.351 
Page pp.167-172 
#Pages 6 
Date of Issue 2012-12-06 (RCS) 

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