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Paper Abstract and Keywords
Presentation 2021-08-26 16:40
BLER Performance of Circular 256QAM Schemes Considering Cubic Metric for DFT-Precoded OFDM
Yugo Sasaki, Mamoru Sawahashi (Tokyo City Univ.), Yoshihisa Kishiyama (NTT DOCOMO) RCS2021-108
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents the average block error rate (BLER) performance of circular 256QAM schemes considering a peak-to-average power ratio measure called a cubic metric (CM) for discrete Fourier transform (DFT)-precoded orthogonal frequency division multiplexing (OFDM) in multipath fading channels. Computer simulation results show that the required average received signal-to-noise power ratio (SNR) satisfying the average BLER of $10^{−2}$ considering the CM for the (16×16) circular 256QAM constellation is deceased by approximately 0.5 dB, and that for the (32×8) and (64×4) circular 256QAM constellations is deceased by approximately 0.3 dB compared to the rectangular 256QAM scheme when using reference signal (RS) based channel estimation. Therefore, we conclude that the circular 256QAM constellation with independent bit mapping to either the phase or amplitude information is effective in achieving a lower required average received SNR satisfying the target average BLER than that for rectangular 256QAM considering the CM in multipath fading channels.
Keyword (in Japanese) (See Japanese page) 
(in English) DFT-precoded OFDM / circular QAM / cubic metric / bit mapping / FDE / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 153, RCS2021-108, pp. 45-50, Aug. 2021.
Paper # RCS2021-108 
Date of Issue 2021-08-19 (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 RCS2021-108

Conference Information
Committee RCS SAT  
Conference Date 2021-08-26 - 2021-08-27 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To RCS 
Conference Code 2021-08-RCS-SAT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) BLER Performance of Circular 256QAM Schemes Considering Cubic Metric for DFT-Precoded OFDM 
Sub Title (in English)  
Keyword(1) DFT-precoded OFDM  
Keyword(2) circular QAM  
Keyword(3) cubic metric  
Keyword(4) bit mapping  
Keyword(5) FDE  
1st Author's Name Yugo Sasaki  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Mamoru Sawahashi  
2nd Author's Affiliation Tokyo City University (Tokyo City Univ.)
3rd Author's Name Yoshihisa Kishiyama  
3rd Author's Affiliation NTT DOCOMO (NTT DOCOMO)
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Date Time 2021-08-26 16:40:00 
Presentation Time 25 
Registration for RCS 
Paper # IEICE-RCS2021-108 
Volume (vol) IEICE-121 
Number (no) no.153 
Page pp.45-50 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2021-08-19 

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