Sparse Channel Estimation for OFDM-Based Underwater Acoustic Systems in Rician Fading With a New OMP-MAP Algorithm

Erdal Panayirci, Mhd Tahssin Altabbaa, Murat Uysal, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review


In this paper, a new channel estimation algorithm is proposed that exploits channel sparsity in the time domain for an orthogonal frequency division multiplexing (OFDM)-based underwater acoustical (UWA) communications systems in the presence of Rician fading. A path-based channel model is used, in which the channel is described by a limited number of paths, each characterized by a delay, Doppler scale, and attenuation factor. The resulting algorithm initially estimates the overall sparse channel tap delays and Doppler shifts using a compressed sensing approach, in the form of the orthogonal matching pursuit (OMP) algorithm. Then, a computationally efficient and novel channel estimation algorithm is developed by combining the OMP and maximum a posteriori probability (MAP) techniques for estimating the sparse complex channel path gains whose prior densities have complex Gaussian distributions with unknown mean and variance vectors, where a computationally efficient maximum likelihood algorithm is proposed for their estimation. Monte Carlo simulation results show that the mean square error and symbol error rate performances of the OMP-MAP algorithm uniformly outperforms the conventional OMP-based channel estimation algorithm, in case of uncoded OFDM-based UWA communications systems.

Original languageEnglish (US)
Article number8618320
Pages (from-to)1550-1565
Number of pages16
JournalIEEE Transactions on Signal Processing
Issue number6
StatePublished - Mar 15 2019


  • MAP estimation
  • OFDM
  • Underwater acoustic channel estimation
  • equalization
  • orthogonal matching pursuit

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering


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