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

Authors

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

Keywords:

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).

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Author Biographies

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

     

     

     

     

     

     

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

     

     

     

     

     

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

     

     

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

     

     

     

Published

2023-08-24

Issue

Vol. 89 (2023)

Section

Overview