Two-stage Long-correlation Signal Acquisition Method for Through-the-earth Communication of the Ground Electrode Current Field

XU Zhan; ZHANG Xu; YANG Xiaolong

doi:10.11999/JEIT240399

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XU Zhan, ZHANG Xu, YANG Xiaolong. Two-stage Long-correlation Signal Acquisition Method for Through-the-earth Communication of the Ground Electrode Current Field[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT240399

Citation:

XU Zhan, ZHANG Xu, YANG Xiaolong. Two-stage Long-correlation Signal Acquisition Method for Through-the-earth Communication of the Ground Electrode Current Field[J]. Journal of Electronics & Information Technology. doi: 10.11999/JEIT240399

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Two-stage Long-correlation Signal Acquisition Method for Through-the-earth Communication of the Ground Electrode Current Field

doi: 10.11999/JEIT240399

XU Zhan^{1, 2},
ZHANG Xu²,
YANG Xiaolong^{2
,
,}

1.
Key Laboratory of Modern Measurement and Control Technology of the Ministry of Education, Beijing Information Science and Technology University, Beijing 102206, China
2.
Institute of Information and Communication Engineering, Beijing Information Science and Technology University, Beijing 102206, China

Funds: The National Key Research and Development Program (2020YFC1511701), The Scientific Research Program of Beijing Municipal Education Commission (KM202211232006), Beijing University of Information Science and Technology promotes the classified development of universities - Key Research and Cultivation Fund (2121YJPY222)

Received Date: 2024-05-21
Rev Recd Date: 2024-09-06

Available Online: 2024-09-17

Abstract

Abstract

Wireless through-the-earth communication provides a solution for information transmission in heavily shielded space. The received current field signal has low Signal-to-Noise Ratio (SNR), is easily distorted, and is greatly affected by carrier frequency offset, making signal acquisition difficult. In this paper, a long synchronization signal frame structure is designed and a two-stage long correlation signal acquisition algorithm is proposed that combines coarse and fine frequency offset estimation. In the first stage, the training symbols in the received time-domain signal are used for coarse estimation of sampling interval deviation based on the maximum likelihood algorithm, and the coarse estimation value of the sampling point compensation interval is calculated. In the second stage, the coarse estimation value and the received SNR are combined to determine the traversal range of the fine estimation value of the sampling point compensation interval. A long correlation template signal with local compensation is designed to achieve accurate acquisition of the current field signal. The algorithm’s performance is verified in a heavily shielded space located 30.26 m below the ground. Experimental results show that compared to traditional sliding correlation algorithms, the proposed algorithm has a higher acquisition success probability.
- Heavily shielded space,
- Through-the-earth communications,
- Ground electrode current field,
- Long correlation template signal,
- Acquisition algorithm

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References(16)

References

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