|Table of Contents|

Citation:
　Xuesong Lu,Yulin Jiang,Jingxuan Li,et al.Time-Varying Channel Estimation and Symbol Detection for Underwater Acoustic FBMC-OQAM Communications[J].Journal of Marine Science and Application,2023,(3):636-649.[doi:10.1007/s11804-023-00358-2]
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Time-Varying Channel Estimation and Symbol Detection for Underwater Acoustic FBMC-OQAM Communications

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Title:
Time-Varying Channel Estimation and Symbol Detection for Underwater Acoustic FBMC-OQAM Communications
Author(s):
Xuesong Lu1; 2;  Yulin Jiang1; 2;  Jingxuan Li1; 2;  Wei Yan1; 2;  Xingbin Tu1; 2;  Fengzhong Qu1; 2
Affilations:
Author(s):
Xuesong Lu1; 2;  Yulin Jiang1; 2;  Jingxuan Li1; 2;  Wei Yan1; 2;  Xingbin Tu1; 2;  Fengzhong Qu1; 2
1. Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Zhoushan 316021, China;
2. Engineering Research Center of Oceanic Sensing Technology and Equipment, Ministry of Education, Zhejiang University, Zhoushan 316021, China
Keywords:
FBMC-OQAM; Underwater acoustic communications; Channel estimation; Time-varying channel; Data reuse; Iterative estimation
分类号:
-
DOI:
10.1007/s11804-023-00358-2
Abstract:
Filter bank multicarrier (FBMC) systems with offset quadrature amplitude modulation (OQAM) need long data blocks to achieve high spectral efficiency. However, the transmission of long data blocks in underwater acoustic (UWA) communication systems often encounters the challenge of time-varying channels. This paper proposes a time-varying channel tracking method for short-range high-rate UWA FBMC-OQAM communication applications. First, a known preamble is used to initialize the channel estimation at the initial time of the signal block. Next, the estimated channel is applied to detect data symbols at several symbol periods. The detected data symbols are then reused as new pilots to estimate the next time channel. In the above steps, the unified transmission matrix model is extended to describe the time-varying channel input–output model in this paper and is used for symbol detection. Simulation results show that the channel tracking error can be reduced to less than -20 dB when the channel temporal coherence coefficient exceeds 0.75 within one block period of FBMC-OQAM signals. Compared with conventional known-pilot-based methods, the proposed method needs lower system overhead while exhibiting similar time-varying channel tracking performance. The sea trial results further proved the practicability of the proposed method.

References:

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Memo

Memo:
Received date:2022-12-27;Accepted date:2023-2-28。
Foundation item:Supported by the National Natural Science Foundation of China under Grant Nos. 62171405, 62225114 and 62101489.
Corresponding author:Wei Yan,E-mail:redwine447@zju.edu.cn
Last Update: 2023-10-10