Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications
M-ary<b> </b>pulse-amplitude modulation (PAM) meets the requirements of data center communication because of its simplicity, but coarse entropy granularity cannot meet the dynamic bandwidth demands, and there is a large capacity gap between uniform formats and the Shannon limit. The dens...
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| Format: | Article |
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MDPI AG
2019-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/23/4996 |
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| author | Xiao Han Mingwei Yang Ivan B. Djordjevic Yang Yue Qiang Wang Zhen Qu Jon Anderson |
| author_facet | Xiao Han Mingwei Yang Ivan B. Djordjevic Yang Yue Qiang Wang Zhen Qu Jon Anderson |
| author_sort | Xiao Han |
| collection | DOAJ |
| description | M-ary<b> </b>pulse-amplitude modulation (PAM) meets the requirements of data center communication because of its simplicity, but coarse entropy granularity cannot meet the dynamic bandwidth demands, and there is a large capacity gap between uniform formats and the Shannon limit. The dense wavelength division multiplexing (DWDM) system is widely used to increase the channel capacity, but low spectral efficiency of the intensity modulation/direct detection (IM/DD) solution restricts the throughput of the modern DWDM data center networks. Probabilistic shaping distribution is a good candidate to offer us a fine entropy granularity and efficiently reduce the gap to the Shannon limit, and Nyquist pulse shaping is widely used to increase the spectral efficiency. We aim toward the joint usage of probabilistic shaping and Nyquist pulse shaping with low-density parity-check (LDPC) coding to improve the bit error rate (BER) performance of 8-PAM signal transmission. We optimized the code rate of the LDPC code and compared different Nyquist pulse shaping parameters using simulations and experiments. We achieved a 0.43 dB gain using Nyquist pulse shaping, and a 1.1 dB gain using probabilistic shaping, while the joint use of probabilistic shaping and Nyquist pulse shaping achieved a 1.27 dB gain, which offers an excellent improvement without upgrading the transceivers. |
| first_indexed | 2024-12-14T05:18:54Z |
| format | Article |
| id | doaj.art-d1f8c57dddd14f6fbaa4600074d4ab83 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-14T05:18:54Z |
| publishDate | 2019-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-d1f8c57dddd14f6fbaa4600074d4ab832022-12-21T23:15:43ZengMDPI AGApplied Sciences2076-34172019-11-01923499610.3390/app9234996app9234996Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center CommunicationsXiao Han0Mingwei Yang1Ivan B. Djordjevic2Yang Yue3Qiang Wang4Zhen Qu5Jon Anderson6ECE Department, University of Arizona, Tucson, AZ 85721, USAECE Department, University of Arizona, Tucson, AZ 85721, USAECE Department, University of Arizona, Tucson, AZ 85721, USAJuniper Networks, 1133 Innovation Way, Sunnyvale, CA 94089, USAJuniper Networks, 1133 Innovation Way, Sunnyvale, CA 94089, USAJuniper Networks, 1133 Innovation Way, Sunnyvale, CA 94089, USAJuniper Networks, 1133 Innovation Way, Sunnyvale, CA 94089, USAM-ary<b> </b>pulse-amplitude modulation (PAM) meets the requirements of data center communication because of its simplicity, but coarse entropy granularity cannot meet the dynamic bandwidth demands, and there is a large capacity gap between uniform formats and the Shannon limit. The dense wavelength division multiplexing (DWDM) system is widely used to increase the channel capacity, but low spectral efficiency of the intensity modulation/direct detection (IM/DD) solution restricts the throughput of the modern DWDM data center networks. Probabilistic shaping distribution is a good candidate to offer us a fine entropy granularity and efficiently reduce the gap to the Shannon limit, and Nyquist pulse shaping is widely used to increase the spectral efficiency. We aim toward the joint usage of probabilistic shaping and Nyquist pulse shaping with low-density parity-check (LDPC) coding to improve the bit error rate (BER) performance of 8-PAM signal transmission. We optimized the code rate of the LDPC code and compared different Nyquist pulse shaping parameters using simulations and experiments. We achieved a 0.43 dB gain using Nyquist pulse shaping, and a 1.1 dB gain using probabilistic shaping, while the joint use of probabilistic shaping and Nyquist pulse shaping achieved a 1.27 dB gain, which offers an excellent improvement without upgrading the transceivers.https://www.mdpi.com/2076-3417/9/23/4996pulse amplitude modulationnyquist pulse shapingdwdm systemldpc coding |
| spellingShingle | Xiao Han Mingwei Yang Ivan B. Djordjevic Yang Yue Qiang Wang Zhen Qu Jon Anderson Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications Applied Sciences pulse amplitude modulation nyquist pulse shaping dwdm system ldpc coding |
| title | Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications |
| title_full | Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications |
| title_fullStr | Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications |
| title_full_unstemmed | Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications |
| title_short | Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications |
| title_sort | joint probabilistic nyquist pulse shaping for an ldpc coded 8 pam signal in dwdm data center communications |
| topic | pulse amplitude modulation nyquist pulse shaping dwdm system ldpc coding |
| url | https://www.mdpi.com/2076-3417/9/23/4996 |
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