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Paper Abstract and Keywords
Presentation 2026-08-27 14:30
Design of an Early-Exit Mechanism for Reducing Computational Complexity in OFDM Neural Receivers
Ryugo Sato, Roma Tsutsumi, Yoshiaki Narusue, Hiroyuki Morikawa (Univ. of Tokyo) RCS2026-102
Abstract (in Japanese) (See Japanese page) 
(in English) This paper investigates an early-exit inference mechanism that reduces the computational complexity of neural receivers for orthogonal frequency division multiplexing (OFDM).
The receiver produces log-likelihood ratios (LLRs) at an intermediate layer, and inference terminates for each received block according to the confidence estimated from the LLRs.
Through link-level simulations, we design and evaluate the mechanism, showing that the threshold provides continuous control over the trade-off between block error rate (BLER) and computational complexity, and that the mean binary entropy of the LLRs discriminates decoding success more reliably than the mean absolute LLR.
Even in the region where switching based on the SNR yields no savings, early exit with the entropy-based metric reduces the average complexity by 50.3% while keeping the increase in the $E_{mathrm{b}}/N_0$ required for a BLER of 10% within 0.2 dB.
Keyword (in Japanese) (See Japanese page) 
(in English) neural receiver / early exit / computational complexity / OFDM / log-likelihood ratio / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 159, RCS2026-102, pp. 84-89, Aug. 2026.
Paper # RCS2026-102 
Date of Issue 2026-08-20 (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 RCS2026-102

Conference Information
Committee SAT RCS  
Conference Date 2026-08-27 - 2026-08-28 
Place (in Japanese) (See Japanese page) 
Place (in English) BENEX Nagasaki Brick Hall 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Satellite Communications, Broadcasting, Forward Error Correction, Wireless Communications, etc. 
Paper Information
Registration To RCS 
Conference Code 2026-08-SAT-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Design of an Early-Exit Mechanism for Reducing Computational Complexity in OFDM Neural Receivers 
Sub Title (in English)  
Keyword(1) neural receiver  
Keyword(2) early exit  
Keyword(3) computational complexity  
Keyword(4) OFDM  
Keyword(5) log-likelihood ratio  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Ryugo Sato  
1st Author's Affiliation The University of Tokyo (Univ. of Tokyo)
2nd Author's Name Roma Tsutsumi  
2nd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
3rd Author's Name Yoshiaki Narusue  
3rd Author's Affiliation The University of Tokyo (Univ. of Tokyo)
4th Author's Name Hiroyuki Morikawa  
4th Author's Affiliation The University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2026-08-27 14:30:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2026-102 
Volume (vol) vol.126 
Number (no) no.159 
Page pp.84-89 
#Pages 6 
Date of Issue 2026-08-20 (RCS) 

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