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Paper Abstract and Keywords
Presentation 2018-06-22 10:20
PAPR Performance of High-Order Circular QAM Constellation With Phase Noise Robustness
Miyu Nakabayashi, Bin Zheng, Mamoru Sawahashi (Tokyo City Univ.), Norifumi Kamiya (NEC) RCS2018-68
Abstract (in Japanese) (See Japanese page) 
(in English) We recently proposed high-order circular quadrature amplitude modulation (QAM) constellation using partial low-density parity-check (LDPC) code aiming at the application to wireless microwave backhaul. This paper presents peak-to-average power ratio (PAPR) performance of circular 1024QAM, 2048QAM, and 4096QAM constellations based on our proposed design method, and compare them with those rectangular 1024QAM, cross 2048QAM, and rectangular 4096QAM, respectively. We also present the corresponding bit error rate (BER) performance of these circular QAM constellations using partial LDPC coding with parallel double Gray mapping. Computer simulation results show that the circular QAM constellations achieve equal or lower PAPR compared to that of the corresponding rectangular or cross QAM constellation with the same frequency efficiency. Therefore, we conclude that high-order circular 2k QAM constellation (k is an integer) based on the proposed design method is more advantageous in decreasing the PAPR as well as achieving the better BER compared to the rectangular QAM constellation when using partial LDPC coding with double Gray mapping.
Keyword (in Japanese) (See Japanese page) 
(in English) Circular QAM constellation / Partial LDPC coding / Double Gray mapping / PAPR / Phase noise / / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 101, RCS2018-68, pp. 195-200, June 2018.
Paper # RCS2018-68 
Date of Issue 2018-06-13 (RCS) 
ISSN Online edition: ISSN 2432-6380
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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 RCS  
Conference Date 2018-06-20 - 2018-06-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Nagasaki University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Railroad Communications, Inter-Vehicle Communications, Road to Vehicle Communications, Resource Control, Scheduling, Wireless Communication Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2018-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) PAPR Performance of High-Order Circular QAM Constellation With Phase Noise Robustness 
Sub Title (in English)  
Keyword(1) Circular QAM constellation  
Keyword(2) Partial LDPC coding  
Keyword(3) Double Gray mapping  
Keyword(4) PAPR  
Keyword(5) Phase noise  
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Keyword(8)  
1st Author's Name Miyu Nakabayashi  
1st Author's Affiliation Tokyo City University (Tokyo City Univ.)
2nd Author's Name Bin Zheng  
2nd Author's Affiliation Tokyo City University (Tokyo City Univ.)
3rd Author's Name Mamoru Sawahashi  
3rd Author's Affiliation Tokyo City University (Tokyo City Univ.)
4th Author's Name Norifumi Kamiya  
4th Author's Affiliation NEC Corporation (NEC)
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Speaker Author-1 
Date Time 2018-06-22 10:20:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2018-68 
Volume (vol) vol.118 
Number (no) no.101 
Page pp.195-200 
#Pages
Date of Issue 2018-06-13 (RCS) 


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