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Paper Abstract and Keywords
Presentation 2021-11-19 13:25
Four-mode multiplexed real-time 16QAM transmission using high-accuracy frequency offset estimation algorithm
Shohei Beppu (KDDI Research, Inc.), Masahiro Kikuta (NEC Platforms, Ltd.), Koji Igarashi (Osaka University), Hiroshi Mukai, Masahiro Shigihara (NEC Platforms, Ltd.), Daiki Soma, Hidenori Takahashi, Noboru Yoshikane, Takehiro Tsuritani (KDDI Research, Inc.) OCS2021-31
Abstract (in Japanese) (See Japanese page) 
(in English) Mode-division-multiplexed (MDM) transmission systems with multiple-input multiple-output digital signal processing (MIMO-DSP) which enables to compensate modal coupling is an attractive candidate for future high capacity transmission systems. To date, high-capacity mode-division-multiplexed transmissions were reported, although the MIMO equalization was implemented in an off-line DSP. It is indispensable to verify the real-time transmission performance with utilizing real-time MIMO DSP implemented in algorithm specific integrated circuits (ASICs) for the practical MDM transmission systems. Prior to ASIC implementation, field-programmable gate array (FPGA)implementation of real-time MIMO DSP was reported and real-time MDM transmission experiments were demonstrated in recent years. Since the aims in these experiments were verification of large-scale MIMO DSP, the modulation format was quadrature phase shift keying (QPSK). To date, real-time mode-division-multiplexed quadrature amplitude modulation (QAM) transmission has not been reported. Because QAM signals are weaker against frequency offset than QPSK, which is caused by a frequency difference of lasers of transmitter and receiver, the frequency offset should be estimated and compensated with high-accuracy in receiver-side DSP. However, as the frequency resolution increases, the calculation complexity increases. Considering the hardware implementation, a low-complexity and high-accuracy frequency offset estimation algorithm was desired. In this work, to realize demodulation of mode-multiplexed 16QAM in real-time, a low-complexity and high-accuracy frequency offset estimation algorithm based on two-stage structure was proposed and it was implemented in a FPGA board. By using it with MIMO processing, we report the first real-time mode-division-multiplexed 16QAM transmission over a 60.2-km coupled four-core fiber.
Keyword (in Japanese) (See Japanese page) 
(in English) Mode-multiplexed transmission technique / MIMO signal processing / FPGA implementation / / / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 251, OCS2021-31, pp. 15-20, Nov. 2021.
Paper # OCS2021-31 
Date of Issue 2021-11-11 (OCS) 
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 OFT OCS IEE-CMN ITE-BCT  
Conference Date 2021-11-18 - 2021-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To OCS 
Conference Code 2021-11-OFT-OCS-CMN-BCT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Four-mode multiplexed real-time 16QAM transmission using high-accuracy frequency offset estimation algorithm 
Sub Title (in English)  
Keyword(1) Mode-multiplexed transmission technique  
Keyword(2) MIMO signal processing  
Keyword(3) FPGA implementation  
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1st Author's Name Shohei Beppu  
1st Author's Affiliation KDDI Research, Inc. (KDDI Research, Inc.)
2nd Author's Name Masahiro Kikuta  
2nd Author's Affiliation NEC Platforms, Ltd. (NEC Platforms, Ltd.)
3rd Author's Name Koji Igarashi  
3rd Author's Affiliation Osaka University (Osaka University)
4th Author's Name Hiroshi Mukai  
4th Author's Affiliation NEC Platforms, Ltd. (NEC Platforms, Ltd.)
5th Author's Name Masahiro Shigihara  
5th Author's Affiliation NEC Platforms, Ltd. (NEC Platforms, Ltd.)
6th Author's Name Daiki Soma  
6th Author's Affiliation KDDI Research, Inc. (KDDI Research, Inc.)
7th Author's Name Hidenori Takahashi  
7th Author's Affiliation KDDI Research, Inc. (KDDI Research, Inc.)
8th Author's Name Noboru Yoshikane  
8th Author's Affiliation KDDI Research, Inc. (KDDI Research, Inc.)
9th Author's Name Takehiro Tsuritani  
9th Author's Affiliation KDDI Research, Inc. (KDDI Research, Inc.)
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Speaker Author-1 
Date Time 2021-11-19 13:25:00 
Presentation Time 25 minutes 
Registration for OCS 
Paper # OCS2021-31 
Volume (vol) vol.121 
Number (no) no.251 
Page pp.15-20 
#Pages
Date of Issue 2021-11-11 (OCS) 


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