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Paper Abstract and Keywords
Presentation 2013-02-27 13:40
BLER Performance of Star 16QAM Using Iterative Decision-Directed Channel Estimation for DFT-Precoded OFDMA
Chihiro Mori (Tokyo City Univ.), Teruo Kawamura, Nobuhiko Miki (NTT DOCOMO), Mamoru Sawahashi (Tokyo City Univ.) RCS2012-317
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents the average block error rate (BLER) performance of the star 16QAM scheme using iterative decision-directed channel estimation (DDCE) for discrete Fourier transform (DFT)-precoded orthogonal frequency division multiple access (OFDMA). The star 16QAM scheme achieves more efficient modulation compared to square 16QAM in that it decreases the actual required average received signal-to-noise power ratio (SNR) satisfying the target average BLER considering the peak-to-average power ratio (PAPR) of the transmitted signal for a low channel coding rate. Hence, the feature of the paper is that we apply iterative DDCE using soft-decision symbol estimation based on the log-likelihood ratio (LLR) of an extrinsic probability at the Max-Log-MAP (maximum a posteriori probability) decoder output to achieve an efficient modulation scheme with a low required average received SNR. Computer simulation results show that for the star 16QAM scheme, the average BLER using the iterative DDCE is very close to that with ideal channel estimation for a low channel coding rate such as an R = 1/3 turbo code. We also show that when iterative DDCE is employed, the (8, 8) star 16QAM scheme decreases the required average received SNR considering the cubic metric at the average BLER of 10-2 by approximately 0.7 dB compared to the square 16QAM scheme.
Keyword (in Japanese) (See Japanese page) 
(in English) single-carrier FDMA / 16QAM / channel estimation / PAPR / cubic metric / / /  
Reference Info. IEICE Tech. Rep., vol. 112, no. 443, RCS2012-317, pp. 201-206, Feb. 2013.
Paper # RCS2012-317 
Date of Issue 2013-02-20 (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 RCS2012-317

Conference Information
Committee RCS SR SRW  
Conference Date 2013-02-27 - 2013-03-01 
Place (in Japanese) (See Japanese page) 
Place (in English) Waseda Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2013-02-RCS-SR-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) BLER Performance of Star 16QAM Using Iterative Decision-Directed Channel Estimation for DFT-Precoded OFDMA 
Sub Title (in English)  
Keyword(1) single-carrier FDMA  
Keyword(2) 16QAM  
Keyword(3) channel estimation  
Keyword(4) PAPR  
Keyword(5) cubic metric  
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1st Author's Name Chihiro Mori  
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 Nobuhiko Miki  
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 2013-02-27 13:40:00 
Presentation Time 20 minutes 
Registration for RCS 
Paper # RCS2012-317 
Volume (vol) vol.112 
Number (no) no.443 
Page pp.201-206 
#Pages 6 
Date of Issue 2013-02-20 (RCS) 

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