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 |
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) |
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OCS2021-31 |
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) |
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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) |
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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 |
6 |
Date of Issue |
2021-11-11 (OCS) |
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