UACE: Rake receiver with interference cancellation for an underwater acoustic modem

    Back


    • Session: 19. Underwater Communications and Networking
      Organiser(s): Charalampos Tsimenidis, Paul Mitchell and Konstantinos Pelekanakis
    • Lecture: Rake receiver with interference cancellation for an underwater acoustic modem [invited]
      Paper ID: 1899
      Author(s): Shen Lu, Henson Benjamin, Morozs Nils, Zakharov Yuriy, Mitchell Paul
      Presenter: Shen Lu
      Abstract: To achieve reliable communication in underwater acoustic (UWA) channels, UWA modems must deal with both multipath propagation and Doppler distortions. Doppler estimation/compensation, channel estimation and equalization are essential for UWA modem design. In this paper, a new Rake receiver with interference cancellation (IC) is proposed to improve the detection performance. The conventional Rake receiver provides the maximal ratio combining of multipath components. However, the intersymbol interference due to the multipath components is not addressed, which can significantly degrade the receiver performance at high data rates. With multipath interference cancellation, the proposed Rake-IC algorithm can significantly improve the receiver performance. The Rake-IC algorithm is integrated into a UWA modem operating at high data rates. The single-carrier transmission with superimposed data and pilot symbols is considered. The channel estimation and multipath combining are implemented in the frequency domain. Turbo iterations are used in the receiver to improve its performance. The performance of the UWA modem with the Rake-IC algorithm is investigated and compared with that of the conventional Rake receiver and linear equalizer in numerical and lake experiments. Frame error rate (FER) is used for the performance evaluation. For numerical simulations, effective data rates of 2 kbps and 3 kbps are considered. At a FER of 0.01, the Rake-IC receiver achieves an SNR (signal-to-noise ratio) gain of 9 dB compared with the linear equalizer at both data rates, while the conventional Rake receiver cannot provide reliable detection within the SNR range we considered. Results from lake experiments also demonstrate high detection performance of the UWA modem with the proposed Rake-IC algorithm, in comparison with the conventional Rake receiver and linear equalizer.
        Download the full paper
    • Corresponding author: Dr Lu Shen
      Affiliation: University of York
      Country: United Kingdom
      e-mail:

    Back