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Paper Abstract and Keywords
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
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
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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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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  
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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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