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      Multiple-resampling receiver design for OFDM over Doppler-distorted underwater acoustic channels

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      Author
      Tu, K.
      Duman, T. M.
      Stojanovic, M.
      Proakis J. G.
      Date
      2013
      Source Title
      IEEE Journal of Oceanic Engineering
      Print ISSN
      0364-9059
      Volume
      38
      Issue
      2
      Pages
      333 - 346
      Language
      English
      Type
      Article
      Item Usage Stats
      128
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      Abstract
      In this paper, we focus on orthogonal frequency-division multiplexing (OFDM) receiver designs for underwater acoustic (UWA) channels with user-and/or path-specific Doppler scaling distortions. The scenario is motivated by the cooperative communications framework, where distributed transmitter/receiver pairs may experience significantly different Doppler distortions, as well as by the single-user scenarios, where distinct Doppler scaling factors may exist among different propagation paths. The conventional approach of front-end resampling that corrects for common Doppler scaling may not be appropriate in such scenarios, rendering a post-fast-Fourier-transform (FFT) signal that is contaminated by user-and/or path-specific intercarrier interference. To counteract this problem, we propose a family of front-end receiver structures that utilize multiple-resampling (MR) branches, each matched to the Doppler scaling factor of a particular user and/or path. Following resampling, FFT modules transform the Doppler-compensated signals into the frequency domain for further processing through linear or nonlinear detection schemes. As part of the overall receiver structure, a gradient-descent approach is also proposed to refine the channel estimates obtained by standard sparse channel estimators. The effectiveness and robustness of the proposed receivers are demonstrated via simulations, as well as emulations based on real data collected during the 2010 Mobile Acoustic Communications Experiment (MACE10, Martha's Vineyard, MA) and the 2008 Kauai Acomms MURI (KAM08, Kauai, HI) experiment.
      Keywords
      Channel estimation
      Doppler effect
      Acoustic communications
      Conventional approach
      Intercarrier interference
      Nonlinear detection schemes
      Receiver structure
      Time varying channel
      Underwater acoustic channels
      Underwater communication
      Channel estimation
      Doppler effect
      Experiments
      Fast Fourier transforms
      Intelligent control
      Interference suppression
      Matched filters
      Mathematical transformations
      MIMO systems
      Multiuser detection
      Orthogonal frequency division multiplexing
      Underwater acoustics
      Signal systems
      Permalink
      http://hdl.handle.net/11693/21166
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/JOE.2012.2221812
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      • Department of Electrical and Electronics Engineering 3524
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