Suitable pilot search method for channel estimation in underwater acoustic OFDM systems

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Authors

  • Nguyen Thi Nga Institute of Electronics, Academy of Military Science and Technology
  • Phan Huy Anh Institute of Electronics, Academy of Military Science and Technology
  • Cao Van Loi Faculty of Information Technology, Le Quy Don Technical University
  • Pham Thanh Hiep (Corresponding Author) Advanced Wireless Communications Group, Le Quy Don Technical University

DOI:

https://doi.org/10.54939/1859-1043.j.mst.89.2023.52-59

Keywords:

UWA-OFDM; Channel Estimation; LS; MMSE; Suitable Pilot Search.

Abstract

The underwater environment poses challenges to the Underwater Acoustic OFDM (UWA-OFDM) system, causing the tendency of lacking pilots to recover the channel impulse response (CIR). Our previous research (pilot enrichment estimator) supplemented potential pilots based on the distance to the nearest constellation point below a fixed threshold T. However, this does not guarantee that the extracted pilots have sufficiently good quality. Therefore, this article presents a suitable pilot search (SPS) method with the flexible threshold T and second minimum mean square error (MMSE) estimation to improve channel estimation effectiveness in UWA-OFDM systems. Our approach is compared to the MMSE and PE methods across various criteria, such as pilot spacing and different modulators. The experiments demonstrate that the SPS estimator performs better than the MMSE and PE techniques regarding bit error rate (BER).

Author Biographies

Nguyen Thi Nga, Institute of Electronics, Academy of Military Science and Technology

 

 

 

 

 

 

Phan Huy Anh , Institute of Electronics, Academy of Military Science and Technology

 

 

 

 

 

Cao Van Loi, Faculty of Information Technology, Le Quy Don Technical University

 

 

Pham Thanh Hiep, Advanced Wireless Communications Group, Le Quy Don Technical University

 

 

 

References

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Published

25-08-2023

How to Cite

Thi Nga, N., H. A. Phan, V. L. Cao, and T. H. Pham. “Suitable Pilot Search Method for Channel Estimation in Underwater Acoustic OFDM Systems”. Journal of Military Science and Technology, vol. 89, no. 89, Aug. 2023, pp. 52-59, doi:10.54939/1859-1043.j.mst.89.2023.52-59.

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