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

  • 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: 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).

Tác giả

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

 

 

 

điểm /   đánh giá
Published
2023-08-25
Issue
Vol. 89 (2023)
Section
Overview