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| Presentation | 2016-11-10 16:50 LLR generation of 4D modulation based on inverse code Tatsuya Nakamura, Emmanuel Le Taillandier de Gabory, Hidemi Noguchi, Jun'ichi Abe (NEC)  OCS2016-59 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | Exponentially increasing internet traffic requires optimal exploitation of spectral resource of optical network. Therefore, coded modulation is attracting attention as a strong candidate for utilization of spectral resource by switching modulation format in adaptation to transmission condition and improving transmission reach. So far, we have proposed new 4D-modulation scheme, 4D-SP64-12QAM, which enables improvement of receiver sensitivity and simple demodulation process. The square constellation that is compatible with PM-16QAM simplifies the demodulation process considering a multi-format DSP. However, it has been pointed out that multi-dimensional modulation formats suffer from complex calculation process of log-likelihood ratio (LLR) which is indispensable for reliable transmission using soft-decision code. In this paper, we propose inverse code method that is applicable to any other coded modulation. We show that LLR of 4D-SP64-12QAM can be calculated with combination of low-dimensional look-up table and simple calculation based on inverse code. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Modulation format / Coded modulation / Soft-Decision / Log Likelihood ratio / / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 116, no. 294, OCS2016-59, pp. 13-18, Nov. 2016. | |
| Paper # | OCS2016-59 | |
| Date of Issue | 2016-11-03 (OCS) | |
| ISSN | Print edition: ISSN 0913-5685 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 | OCS2016-59 |
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| Conference Information | |
| Committee | OFT OCS IEE-CMN ITE-BCT |
| Conference Date | 2016-11-10 - 2016-11-11 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Nagasaki Shoko Kaigi Sho |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | OCS |
| Conference Code | 2016-11-OFT-OCS-CMN-BCT |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | LLR generation of 4D modulation based on inverse code |
| Sub Title (in English) | |
| Keyword(1) | Modulation format |
| Keyword(2) | Coded modulation |
| Keyword(3) | Soft-Decision |
| Keyword(4) | Log Likelihood ratio |
| Keyword(5) | |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Tatsuya Nakamura |
| 1st Author's Affiliation | NEC Corporation (NEC) |
| 2nd Author's Name | Emmanuel Le Taillandier de Gabory |
| 2nd Author's Affiliation | NEC Corporation (NEC) |
| 3rd Author's Name | Hidemi Noguchi |
| 3rd Author's Affiliation | NEC Corporation (NEC) |
| 4th Author's Name | Jun'ichi Abe |
| 4th Author's Affiliation | NEC Corporation (NEC) |
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| Speaker | Author-1 |
| Date Time | 2016-11-10 16:50:00 |
| Presentation Time | 25 minutes |
| Registration for | OCS |
| Paper # | OCS2016-59 |
| Volume (vol) | vol.116 |
| Number (no) | no.294 |
| Page | pp.13-18 |
| #Pages | 6 |
| Date of Issue | 2016-11-03 (OCS) |
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