International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Doppler-shift estimation of flat underwater channel using data-aided least-square approach

  • Pan, Weiqiang (Information Network Engineering and Research Center, South China University of Technology) ;
  • Liu, Ping (School of Electronics and Information Engineering, South China University of Technologyr) ;
  • Chen, Fangjiong (School of Electronics and Information Engineering, South China University of Technologyr) ;
  • Ji, Fei (School of Electronics and Information Engineering, South China University of Technologyr) ;
  • Feng, Jing (School of Electronics and Information Engineering, South China University of Technologyr)
  • Published : 2015.03.31
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Abstract

In this paper we proposed a dada-aided Doppler estimation method for underwater acoustic communication. The training sequence is non-dedicate, hence it can be designed for Doppler estimation as well as channel equalization. We assume the channel has been equalized and consider only flat-fading channel. First, based on the training symbols the theoretical received sequence is composed. Next the least square principle is applied to build the objective function, which minimizes the error between the composed and the actual received signal. Then an iterative approach is applied to solve the least square problem. The proposed approach involves an outer loop and inner loop, which resolve the channel gain and Doppler coefficient, respectively. The theoretical performance bound, i.e. the Cramer-Rao Lower Bound (CRLB) of estimation is also derived. Computer simulations results show that the proposed algorithm achieves the CRLB in medium to high SNR cases.

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References

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