| Presentation | 2016-11-10 LLR generation of 4D modulation based on inverse code Tatsuya Nakamura, Emmanuel Le Taillandier de Gabory, Hidemi Noguchi, Jun'ichi Abe, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(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) |
| Keyword(in English) | Modulation format / Coded modulation / Soft-Decision / Log Likelihood ratio |
| Paper # | OCS2016-59 |
| Date of Issue | 2016-11-03 (OCS) |
| Conference Information | |
| Committee | OFT / OCS / IEE-CMN / ITE-BCT |
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| Conference Date | 2016/11/10(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Nagasaki Shoko Kaigi Sho |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Chair | Masayuki Shigematsu(Sumitomo Electric Industries) / Akira Hirano(NTT) / Masakiro Muraguchi(Tokyou Univ. of Schience) / Tomoaki Otsuki(Keio Univ.) |
| Vice Chair | / Itsuro Morita(KDDI R&D Labs.) / / Naohiko Iai(NHK) / Akira Hotta(TV Asahi) |
| Secretary | (NTT) / Itsuro Morita(Fujikura) / (NTT) / Naohiko Iai(Sumitomo Electric Industries) / Akira Hotta(CRIEPI) |
| Assistant | Terutake Kobayashi(Fujikura) / Ikutaro Ogushi(NTT) / / Keisuke Utsu(Tokai Univ.) / Tomotaka Kimura(Tokyou Univ. of Schience) / Shoji Tanaka(NHK) / Hidenori Ishida(TV Tokyo) / Masayoshi Fukumoto(NEC) / Madoka Nakamura(NHK) |
| Paper Information | |
| Registration To | Technical Committee on Optical Fiber Technology / Technical Committee on Optical Communication Systems / Technical Meeting on Communications / Technical Group on Broadcasting and Communication Technology |
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| Language | JPN |
| 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 |
| 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) |
| Date | 2016-11-10 |
| Paper # | OCS2016-59 |
| Volume (vol) | vol.116 |
| Number (no) | OCS-294 |
| Page | pp.pp.13-18(OCS), |
| #Pages | 6 |
| Date of Issue | 2016-11-03 (OCS) |