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Paper Abstract and Keywords
Presentation 2021-08-26 11:00
Encoding and Decoding of Polar Codes for Frequency Selective Fading Channels
Song Huiying, Fukawa Kazuhiko, Chang Yuyuan (Tokyo Tech) RCS2021-99
Abstract (in Japanese) (See Japanese page) 
(in English) Recently, the polar code has attracted much attention because it has been adopted as a channel coding for control channels of fifth-generation mobile communications (5G) and beyond. Various schemes have been proposed to improve the performance of polar codes over the AWGN channel, whereas few studies have tackled improvements of polar codes over fading channels. Hence, this report focuses on polar codes for OFDM transmission over frequency selective fading channels. As a Conventional encoding scheme, a bit-flip belief propagation (BP) decoder employing critical set (CS) can improve the block error rate (BLER) of the polar code over the AWGN channel. However, this conventional scheme is expected to incur degradation of BLER over the frequency selective fading channel, because it does not consider the channel state information (CSI). Therefore, this report investigates both encoding and decoding of the polar code based on the CSI for the OFDM frequency selective fading channels. Firstly, the frozen bits and CS of the polar code are assigned on the basis of the log likelihood ratio (LLR) of each encoded bit, which is obtained from the CSI and is used for the BP decoder to estimate the LLR of the information bit. Then in ascending order of the absolute values of these LLRs, the information bits are assigned into the frozen bits and CS. Finally, information on the frozen bits is fed back to the transmitter and used for the encoding of the polar code. The receiver processes the OFDM signal in order to decode the polar code by using information on the frozen bits and CS. Computer simulations demonstrate that the proposed frozen bits and CS designs gain average $E_b/N_0$ of at most 1 dB and 0.7 dB, respectively, over the conventional design schemes.
Keyword (in Japanese) (See Japanese page) 
(in English) OFDM / polar code / frozen bit / critical set / frequency selective fading / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 153, RCS2021-99, pp. 1-6, Aug. 2021.
Paper # RCS2021-99 
Date of Issue 2021-08-19 (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 RCS2021-99

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 English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Encoding and Decoding of Polar Codes for Frequency Selective Fading Channels 
Sub Title (in English)  
Keyword(1) OFDM  
Keyword(2) polar code  
Keyword(3) frozen bit  
Keyword(4) critical set  
Keyword(5) frequency selective fading  
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1st Author's Name Song Huiying  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
2nd Author's Name Fukawa Kazuhiko  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
3rd Author's Name Chang Yuyuan  
3rd Author's Affiliation Tokyo Institute of Technology (Tokyo Tech)
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Speaker Author-1 
Date Time 2021-08-26 11:00:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2021-99 
Volume (vol) vol.121 
Number (no) no.153 
Page pp.1-6 
#Pages 6 
Date of Issue 2021-08-19 (RCS) 

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