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Paper Abstract and Keywords
Presentation 2014-10-17 16:15
Performance of Downlink Control Information Signals Using Decision-Feedback Channel Estimation for EPDCCH
Shinya Hirayama (Tokyo City Univ.), Kazuaki Takeda, Yuichi Kakishima (NTT DOCOMO), Mamoru Sawahashi (Tokyo City Univ.) RCS2014-191
Abstract (in Japanese) (See Japanese page) 
(in English) In Release (Rel.) 11 Long Term Evolution (LTE)-Advanced radio interface, Enhanced Physical Downlink Control Channel (EPDCCH) is specified which transmits downlink control information (DCI) signals.
EPDCCH is frequency-domain-multiplexed with the data symbols and transmits larger number of DCI signals compared to Physical Downlink Control Channel (PDCCH) for Rel. 8 LTE due to the application of multiuser multiple-input multiple-output (MIMO) and coordinated multi-point (CoMP) transmission and reception.
This paper presents the effect of decision-feedback channel estimation (DFCE) using soft-symbol estimation of the DCI signals for EPDCCH.
In the proposed DFCE method, channel estimation accuracy is improved by using soft-symbol estimation of the control signals based on the a posteriori log-likelihood ratio (LLR) at the soft output Viterbi algorithm (SOVA) for convolutional coding in addition to the demodulation reference signals (DM-RSs).
Computer simulation results show that the DFCE is effective in decreasing the transmission power of the DM-RSs to approximately half compared to that for the conventional DM-RSs only to achieve the same target block error rate from low to high Doppler frequency region in frequency-selective Rayleigh fading channel.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile communications / control signals / OFDMA / decision-feedback channel estimation / MMSE channel estimation / EPDCCH / LTE-Advanced /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 254, RCS2014-191, pp. 195-200, Oct. 2014.
Paper # RCS2014-191 
Date of Issue 2014-10-09 (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 RCS2014-191

Conference Information
Committee RCS  
Conference Date 2014-10-16 - 2014-10-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Keio Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, etc. 
Paper Information
Registration To RCS 
Conference Code 2014-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Performance of Downlink Control Information Signals Using Decision-Feedback Channel Estimation for EPDCCH 
Sub Title (in English)  
Keyword(1) Mobile communications  
Keyword(2) control signals  
Keyword(3) OFDMA  
Keyword(4) decision-feedback channel estimation  
Keyword(5) MMSE channel estimation  
Keyword(6) EPDCCH  
Keyword(7) LTE-Advanced  
1st Author's Name Shinya Hirayama  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Kazuaki Takeda  
2nd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
3rd Author's Name Yuichi Kakishima  
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 2014-10-17 16:15:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2014-191 
Volume (vol) vol.114 
Number (no) no.254 
Page pp.195-200 
Date of Issue 2014-10-09 (RCS) 

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