Data Packet Structure and Modem Design for Dynamic Underwater Acoustic Channels

Yuriy Zakharov, Benjamin Henson, Roee Diamant, Yuan Fei, Paul D. Mitchell, Nils Morozs, Lu Shen, Tim C. Tozer

Research output: Contribution to journalArticlepeer-review

Abstract

In underwater acoustic (UWA) communications, the propagated signal undergoes severe Doppler and multipath distortions. The Doppler estimation/compensation and channel estimation/equalization techniques are required to deal with these distortions and contribute significantly to the overall complexity of UWA modems. In this article, we propose a data packet structure for high data rate transmission in time-varying UWA channels with the channel dynamic modeled by velocity and acceleration between the transmitter and the receiver. The data packet consists of superimposed data and periodic pilot sequences. The superposition allows achievement of a high spectral efficiency for data transmission. The repeated pilot symbols allow the use of a low-complexity multibranch autocorrelation method for coarse estimation of Doppler parameters related to the velocity and acceleration. To refine these estimates, we further propose a low-complexity fine Doppler estimator based on dichotomous iterations. We also present a low complexity frequency domain channel estimator exploiting the channel sparsity. The proposed modem design has been evaluated using simulation and practical sea trials. The experiments demonstrate high detection performance of the proposed design, in particular in comparison with a more traditional design that ignores the acceleration between the transmitter and the receiver.

Original languageEnglish
Article number8815825
Pages (from-to)837-849
Number of pages13
JournalIEEE Journal of Oceanic Engineering
Volume44
Issue number4
DOIs
StatePublished - Oct 2019

Bibliographical note

Funding Information:
Manuscript received January 11, 2019; revised June 27, 2019; accepted July 26, 2019. Date of publication August 27, 2019; date of current version October 11, 2019. The work of Y. Zakharov, B. Henson, P. D. Mitchell, and N. Morozs was supported by the U.K. Engineering and Physical Sciences Research Council under Grant EP/P017975/1 and Grant EP/R003297/1. The work of Y. Fei was supported by the Chinese National Science Foundation through Grant 61571377. This work was presented in part at the Fourth Underwater Communications and Networking Conference, Lerici, Italy, August 28–30, 2018. (Corresponding author: Yuriy Zakharov.) Guest Editor: J. Alves.

Publisher Copyright:
© 1976-2012 IEEE.

Keywords

  • Channel estimation
  • Doppler estimation
  • data packet
  • low complexity
  • sparse channel
  • time-varying channel
  • underwater acoustic (UWA) communication

ASJC Scopus subject areas

  • Ocean Engineering
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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