Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation
Achieving accurate channel estimation and adaptive communications with moving transceivers is challenging due to rapid changes in the underwater acoustic channels. We achieve an accurate channel estimation of fast time-varying underwater acoustic channels by using the superimposed training scheme wi...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/161309 |
| _version_ | 1811684866523136000 |
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| author | Wang, Liang Qiao, Peiyue Liang, Junyan Chen, Tong Wang, Xinjie Yang, Guang |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Wang, Liang Qiao, Peiyue Liang, Junyan Chen, Tong Wang, Xinjie Yang, Guang |
| author_sort | Wang, Liang |
| collection | NTU |
| description | Achieving accurate channel estimation and adaptive communications with moving transceivers is challenging due to rapid changes in the underwater acoustic channels. We achieve an accurate channel estimation of fast time-varying underwater acoustic channels by using the superimposed training scheme with a powerful channel estimation algorithm and turbo equalization, where the training sequence and the symbol sequence are linearly superimposed. To realize this, we develop a 'global' channel estimation algorithm based on Gaussian likelihood, where the channel correlation between (among) the segments is fully exploited by using the product of the Gaussian probability-density functions of the segments, thereby realizing an ideal channel estimation of each segment. Moreover, the Gaussian-likelihood-based channel estimation is embedded in turbo equalization, where the information exchange between the equalizer and the decoder is carried out in an iterative manner to achieve an accurate channel estimation of each segment. In addition, an adaptive communication algorithm based on constellation aggregation is proposed to resist the severe fast time-varying multipath interference and environmental noise, where the encoding rate is automatically determined for reliable underwater acoustic communications according to the constellation aggregation degree of equalization results. Field experiments with moving transceivers (the communication distance was approximately 5.5 km) were carried out in the Yellow Sea in 2021, and the experimental results verify the effectiveness of the two proposed algorithms. |
| first_indexed | 2024-10-01T04:35:26Z |
| format | Journal Article |
| id | ntu-10356/161309 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:35:26Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1613092022-08-24T06:48:28Z Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation Wang, Liang Qiao, Peiyue Liang, Junyan Chen, Tong Wang, Xinjie Yang, Guang School of Electrical and Electronic Engineering Engineering::Electrical and electronic engineering Superimposed Training Gaussian Likelihood Achieving accurate channel estimation and adaptive communications with moving transceivers is challenging due to rapid changes in the underwater acoustic channels. We achieve an accurate channel estimation of fast time-varying underwater acoustic channels by using the superimposed training scheme with a powerful channel estimation algorithm and turbo equalization, where the training sequence and the symbol sequence are linearly superimposed. To realize this, we develop a 'global' channel estimation algorithm based on Gaussian likelihood, where the channel correlation between (among) the segments is fully exploited by using the product of the Gaussian probability-density functions of the segments, thereby realizing an ideal channel estimation of each segment. Moreover, the Gaussian-likelihood-based channel estimation is embedded in turbo equalization, where the information exchange between the equalizer and the decoder is carried out in an iterative manner to achieve an accurate channel estimation of each segment. In addition, an adaptive communication algorithm based on constellation aggregation is proposed to resist the severe fast time-varying multipath interference and environmental noise, where the encoding rate is automatically determined for reliable underwater acoustic communications according to the constellation aggregation degree of equalization results. Field experiments with moving transceivers (the communication distance was approximately 5.5 km) were carried out in the Yellow Sea in 2021, and the experimental results verify the effectiveness of the two proposed algorithms. Published version This work was supported in part by the China Scholarship Council, in part by the General Program of National Natural Science Foundation of China under Grant 61771271, in part by the General Project of Natural Science Foundation of Shandong Province under Grant ZR2020MF010 and Grant ZR2020MF001 and in part by the Qingdao Source Innovation Program under Grant 19-6-2-4-cg. 2022-08-24T06:48:27Z 2022-08-24T06:48:27Z 2022 Journal Article Wang, L., Qiao, P., Liang, J., Chen, T., Wang, X. & Yang, G. (2022). Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation. Sensors, 22(6), 2142-. https://dx.doi.org/10.3390/s22062142 1424-8220 https://hdl.handle.net/10356/161309 10.3390/s22062142 35336313 2-s2.0-85125921329 6 22 2142 en Sensors © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). application/pdf |
| spellingShingle | Engineering::Electrical and electronic engineering Superimposed Training Gaussian Likelihood Wang, Liang Qiao, Peiyue Liang, Junyan Chen, Tong Wang, Xinjie Yang, Guang Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title | Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title_full | Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title_fullStr | Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title_full_unstemmed | Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title_short | Accurate channel estimation and adaptive underwater acoustic communications based on Gaussian likelihood and constellation aggregation |
| title_sort | accurate channel estimation and adaptive underwater acoustic communications based on gaussian likelihood and constellation aggregation |
| topic | Engineering::Electrical and electronic engineering Superimposed Training Gaussian Likelihood |
| url | https://hdl.handle.net/10356/161309 |
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