Adaptive EKF Based Estimation Method for Phase Noise in CO-OFDM/OQAM System
Recently, dynamic optical network has attracted wide concern for its high efficiency and flexible configurations. Known for high spectral efficiency and flexible allocations of frequency resources orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) is a prom...
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| Veröffentlicht in: | IEEE access 2020, Vol.8, p.204931-204940 |
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| creator | Wang, Xiaobo Yang, Liu Luo, Fengguang Yang, Shuailong Du, Yuting |
| description | Recently, dynamic optical network has attracted wide concern for its high efficiency and flexible configurations. Known for high spectral efficiency and flexible allocations of frequency resources orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) is a promising scheme for future dynamic networks. Phase noise estimation (PNE) and compensation are key technologies for maintaining the performance of coherent optical OFDM/OQAM system. In this paper, a simplified phase noise (PN) model for OFDM/OQAM under channel effect is deduced according to distribution feature of intrinsic interference. Some blind PNE methods are studied and their specific implementation process for OFDM/OQAM are presented. Based on PN model and Kalman filter theory, we propose a new adaptive extended Kalman filter (AEKF) blind scheme to meet the demand of flexibility in dynamic networks. Numerical results show that AEKF can adjust the implementation complexity of PNE according to the varying laser linewidth. When the commercial laser linewidth is 200 kHz, its time complexity is only 1/3 of that of modified blind phase search with feedback loop. Besides, AEKF can achieve a stable and reliable PNE performance under varying subcarrier allocation. AEKF can achieve a stable normalized linewidth tolerance over 1.5\times 10^{-3} under different subcarrier allocations. |
| doi_str_mv | 10.1109/ACCESS.2020.3037312 |
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Known for high spectral efficiency and flexible allocations of frequency resources orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) is a promising scheme for future dynamic networks. Phase noise estimation (PNE) and compensation are key technologies for maintaining the performance of coherent optical OFDM/OQAM system. In this paper, a simplified phase noise (PN) model for OFDM/OQAM under channel effect is deduced according to distribution feature of intrinsic interference. Some blind PNE methods are studied and their specific implementation process for OFDM/OQAM are presented. Based on PN model and Kalman filter theory, we propose a new adaptive extended Kalman filter (AEKF) blind scheme to meet the demand of flexibility in dynamic networks. Numerical results show that AEKF can adjust the implementation complexity of PNE according to the varying laser linewidth. When the commercial laser linewidth is 200 kHz, its time complexity is only 1/3 of that of modified blind phase search with feedback loop. Besides, AEKF can achieve a stable and reliable PNE performance under varying subcarrier allocation. AEKF can achieve a stable normalized linewidth tolerance over <inline-formula> <tex-math notation="LaTeX">1.5\times 10^{-3} </tex-math></inline-formula> under different subcarrier allocations.</description><identifier>ISSN: 2169-3536</identifier><identifier>EISSN: 2169-3536</identifier><identifier>DOI: 10.1109/ACCESS.2020.3037312</identifier><identifier>CODEN: IAECCG</identifier><language>eng</language><publisher>Piscataway: IEEE</publisher><subject>Adaptive filters ; Adaptive systems ; Allocations ; coherent communication ; Complexity ; Extended Kalman filter ; extended Kalman Filter (EKF) ; Feedback loops ; flexibility ; Kalman filters ; Laser modes ; Noise ; Optical communication ; Optical fiber networks ; Optical noise ; Orthogonal Frequency Division Multiplexing ; orthogonal frequency division multiplexing offset quadrature amplitude modulation (OFDM/OQAM) ; Phase noise ; Phase noise estimation ; Quadrature amplitude modulation ; Resource management ; Subcarriers ; Time complexity</subject><ispartof>IEEE access, 2020, Vol.8, p.204931-204940</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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Known for high spectral efficiency and flexible allocations of frequency resources orthogonal frequency-division multiplexing offset-quadrature amplitude modulation (OFDM/OQAM) is a promising scheme for future dynamic networks. Phase noise estimation (PNE) and compensation are key technologies for maintaining the performance of coherent optical OFDM/OQAM system. In this paper, a simplified phase noise (PN) model for OFDM/OQAM under channel effect is deduced according to distribution feature of intrinsic interference. Some blind PNE methods are studied and their specific implementation process for OFDM/OQAM are presented. Based on PN model and Kalman filter theory, we propose a new adaptive extended Kalman filter (AEKF) blind scheme to meet the demand of flexibility in dynamic networks. Numerical results show that AEKF can adjust the implementation complexity of PNE according to the varying laser linewidth. When the commercial laser linewidth is 200 kHz, its time complexity is only 1/3 of that of modified blind phase search with feedback loop. Besides, AEKF can achieve a stable and reliable PNE performance under varying subcarrier allocation. AEKF can achieve a stable normalized linewidth tolerance over <inline-formula> <tex-math notation="LaTeX">1.5\times 10^{-3} </tex-math></inline-formula> under different subcarrier allocations.</description><subject>Adaptive filters</subject><subject>Adaptive systems</subject><subject>Allocations</subject><subject>coherent communication</subject><subject>Complexity</subject><subject>Extended Kalman filter</subject><subject>extended Kalman Filter (EKF)</subject><subject>Feedback loops</subject><subject>flexibility</subject><subject>Kalman filters</subject><subject>Laser modes</subject><subject>Noise</subject><subject>Optical communication</subject><subject>Optical fiber networks</subject><subject>Optical noise</subject><subject>Orthogonal Frequency Division Multiplexing</subject><subject>orthogonal frequency division multiplexing offset quadrature amplitude modulation (OFDM/OQAM)</subject><subject>Phase noise</subject><subject>Phase noise estimation</subject><subject>Quadrature amplitude modulation</subject><subject>Resource management</subject><subject>Subcarriers</subject><subject>Time complexity</subject><issn>2169-3536</issn><issn>2169-3536</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>ESBDL</sourceid><sourceid>RIE</sourceid><sourceid>DOA</sourceid><recordid>eNpNUU1PwzAMrRBIIOAXcInEuSNxPtoeR9kAwRhocI6SxoVOsIykQ-Lfk1E04YNtPfs9W3pZdsboiDFaXYzrerJYjIACHXHKC85gLzsCpqqcS672__WH2WmMS5qiTJAsjrK7sTPrvvtCMrmbkksT0ZFJ7LsP03d-RWbYv3lHWh_I41sakgffpdytSD3P59Or2cX8aTwji-_Y48dJdtCa94inf_U4e5lOnuub_H5-fVuP7_NG0LLPURQMrHIgpJUCFRQtpUxKZrkxHLAE44oCeCPLilIllIBGFRwsVo2tDPLj7HbQdd4s9TqkZ8O39qbTv4APr9qEvmveURvVKuNa2zBqBHPWSKsgldIi461rk9b5oLUO_nODsddLvwmr9L4GoQBAyUqkLT5sNcHHGLDdXWVUb03Qgwl6a4L-MyGxzgZWh4g7RgVScVHxH-h-f-8</recordid><startdate>2020</startdate><enddate>2020</enddate><creator>Wang, Xiaobo</creator><creator>Yang, Liu</creator><creator>Luo, Fengguang</creator><creator>Yang, Shuailong</creator><creator>Du, Yuting</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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When the commercial laser linewidth is 200 kHz, its time complexity is only 1/3 of that of modified blind phase search with feedback loop. Besides, AEKF can achieve a stable and reliable PNE performance under varying subcarrier allocation. AEKF can achieve a stable normalized linewidth tolerance over <inline-formula> <tex-math notation="LaTeX">1.5\times 10^{-3} </tex-math></inline-formula> under different subcarrier allocations.</abstract><cop>Piscataway</cop><pub>IEEE</pub><doi>10.1109/ACCESS.2020.3037312</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0002-9102-9428</orcidid><orcidid>https://orcid.org/0000-0001-6588-9902</orcidid><orcidid>https://orcid.org/0000-0001-6713-7579</orcidid><orcidid>https://orcid.org/0000-0001-8479-4458</orcidid><orcidid>https://orcid.org/0000-0002-6586-2694</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Adaptive filters Adaptive systems Allocations coherent communication Complexity Extended Kalman filter extended Kalman Filter (EKF) Feedback loops flexibility Kalman filters Laser modes Noise Optical communication Optical fiber networks Optical noise Orthogonal Frequency Division Multiplexing orthogonal frequency division multiplexing offset quadrature amplitude modulation (OFDM/OQAM) Phase noise Phase noise estimation Quadrature amplitude modulation Resource management Subcarriers Time complexity |
| title | Adaptive EKF Based Estimation Method for Phase Noise in CO-OFDM/OQAM System |
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