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Paper Abstract and Keywords
Presentation 2026-06-18 11:15
A Study on Wireless Autoencoder for Data-Driven Tuning of Frozen Bit and Signal Constellation in Polar-Coded Modulation
Ikki Kawabata, Shinsuke Ibi (Doshisha Univ.), Takumi Takahashi (Univ. Osaka), Kazushi Muraoka, Takanobu Doi, Daichi Shirase (NEC), Hisato Iwai (Doshisha Univ.) RCS2026-57
Abstract (in Japanese) (See Japanese page) 
(in English) This study proposes the application of a wireless autoencoder (WAE) to communication systems employing Polar codes. Since the fixed frozen bits of Polar codes are designed under the assumption of a binary erasure channel, they are not necessarily optimal for quadrature amplitude modulation (QAM) or modulation using neural network (NN). In addition, because the decoding process of Polar codes includes nonlinear operations, the noise behavior deviates from a Gaussian distribution, and therefore equally spaced signal point constellations are not necessarily optimal. These issues make it difficult to derive analytically optimal designs. Furthermore, since the frozen-bit positions affect the occurrence probability of modulation symbols, this effect should also be taken into account． Therefore, in this study, we perform data-driven optimization using a WAE that incorporates an NN-based frozen bit selector and an NN-based modulator for signal constellation design． Through computer simulations, we verify its effectiveness and discuss the influence of the learned frozen bit positions on the symbol occurrence probability．
Keyword (in Japanese) (See Japanese page) 
(in English) wireless autoencoder / polar code / frozen bit / signal constellation / neural network / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 72, RCS2026-57, pp. 182-187, June 2026.
Paper # RCS2026-57 
Date of Issue 2026-06-10 (RCS) 
ISSN 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 RCS2026-57

Conference Information
Committee RCS  
Conference Date 2026-06-17 - 2026-06-19 
Place (in Japanese) (See Japanese page) 
Place (in English) The Ohama Nobumoto Memorial Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Wireless Autoencoder for Data-Driven Tuning of Frozen Bit and Signal Constellation in Polar-Coded Modulation 
Sub Title (in English)  
Keyword(1) wireless autoencoder  
Keyword(2) polar code  
Keyword(3) frozen bit  
Keyword(4) signal constellation  
Keyword(5) neural network  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ikki Kawabata  
1st Author's Affiliation Doshisha University (Doshisha Univ.)
2nd Author's Name Shinsuke Ibi  
2nd Author's Affiliation Doshisha University (Doshisha Univ.)
3rd Author's Name Takumi Takahashi  
3rd Author's Affiliation University of Osaka (Univ. Osaka)
4th Author's Name Kazushi Muraoka  
4th Author's Affiliation NEC Corporation (NEC)
5th Author's Name Takanobu Doi  
5th Author's Affiliation NEC Corporation (NEC)
6th Author's Name Daichi Shirase  
6th Author's Affiliation NEC Corporation (NEC)
7th Author's Name Hisato Iwai  
7th Author's Affiliation Doshisha University (Doshisha Univ.)
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Speaker Author-1 
Date Time 2026-06-18 11:15:00 
Presentation Time 10 minutes 
Registration for RCS 
Paper # RCS2026-57 
Volume (vol) vol.126 
Number (no) no.72 
Page pp.182-187 
#Pages 6 
Date of Issue 2026-06-10 (RCS) 

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