A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems
The strong multipath and long delay extensions can lead to large errors in the timing offset estimation and carrier frequency offset estimation of the Orthogonal Frequency Division Multiplexing (OFDM) underwater communication system, resulting in significant performance degradation. Therefore, this...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IEEE
2024-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10427984/ |
| _version_ | 1827351442755682304 |
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| author | Chi Yang Lei Wang Cong Peng Shuhao Zhang Yonglin Cui Chaofei Ma |
| author_facet | Chi Yang Lei Wang Cong Peng Shuhao Zhang Yonglin Cui Chaofei Ma |
| author_sort | Chi Yang |
| collection | DOAJ |
| description | The strong multipath and long delay extensions can lead to large errors in the timing offset estimation and carrier frequency offset estimation of the Orthogonal Frequency Division Multiplexing (OFDM) underwater communication system, resulting in significant performance degradation. Therefore, this paper proposes a robust time-frequency synchronization method for OFDM systems. First, a new preamble based on Constant Amplitude Zero Autocorrelation (CAZAC) sequence is designed, and a new signal timing offset estimation method is developed based on the time domain characteristics of the preamble. Secondly, a two-stage frequency offset estimation (CFO) method is designed in the time domain followed by the frequency domain, which achieves a wide range of high-accuracy frequency offset estimation. Finally, an adaptive threshold signal first-arrival path detection method is proposed to achieve reliable detection of the position of the signal first-arrival path under complex multipath channels. The simulation, pool, and lake experiment results are provided to verify the reliability and effectiveness of this method. Compared with the traditional methods, the proposed method can more accurately obtain the signal timing position and estimate the CFO in complex multipath channels, and at the same time greatly expand the estimation range of the CFO. |
| first_indexed | 2024-03-08T02:03:22Z |
| format | Article |
| id | doaj.art-049d6ff1762c411b9c1abe16bc5adc22 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-03-08T02:03:22Z |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-049d6ff1762c411b9c1abe16bc5adc222024-02-14T00:01:29ZengIEEEIEEE Access2169-35362024-01-0112219082192010.1109/ACCESS.2024.336184510427984A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication SystemsChi Yang0https://orcid.org/0009-0002-3901-4912Lei Wang1https://orcid.org/0000-0003-0931-0710Cong Peng2Shuhao Zhang3Yonglin Cui4https://orcid.org/0000-0001-6535-9901Chaofei Ma5https://orcid.org/0000-0002-8950-7275College of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaCollege of Electrical and Information Engineering, Hunan University, Changsha, ChinaThe strong multipath and long delay extensions can lead to large errors in the timing offset estimation and carrier frequency offset estimation of the Orthogonal Frequency Division Multiplexing (OFDM) underwater communication system, resulting in significant performance degradation. Therefore, this paper proposes a robust time-frequency synchronization method for OFDM systems. First, a new preamble based on Constant Amplitude Zero Autocorrelation (CAZAC) sequence is designed, and a new signal timing offset estimation method is developed based on the time domain characteristics of the preamble. Secondly, a two-stage frequency offset estimation (CFO) method is designed in the time domain followed by the frequency domain, which achieves a wide range of high-accuracy frequency offset estimation. Finally, an adaptive threshold signal first-arrival path detection method is proposed to achieve reliable detection of the position of the signal first-arrival path under complex multipath channels. The simulation, pool, and lake experiment results are provided to verify the reliability and effectiveness of this method. Compared with the traditional methods, the proposed method can more accurately obtain the signal timing position and estimate the CFO in complex multipath channels, and at the same time greatly expand the estimation range of the CFO.https://ieeexplore.ieee.org/document/10427984/Carrier frequency offsettime synchronizationOFDMunderwater acoustic communications |
| spellingShingle | Chi Yang Lei Wang Cong Peng Shuhao Zhang Yonglin Cui Chaofei Ma A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems IEEE Access Carrier frequency offset time synchronization OFDM underwater acoustic communications |
| title | A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems |
| title_full | A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems |
| title_fullStr | A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems |
| title_full_unstemmed | A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems |
| title_short | A Robust Time-Frequency Synchronization Method for Underwater Acoustic OFDM Communication Systems |
| title_sort | robust time frequency synchronization method for underwater acoustic ofdm communication systems |
| topic | Carrier frequency offset time synchronization OFDM underwater acoustic communications |
| url | https://ieeexplore.ieee.org/document/10427984/ |
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