Apparatus, systems and methods for enhanced detection, synchronization and online Doppler scale estimation for underwater acoustic communications
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United States of America Patent
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Jun 18, 2013
Grant Date -
Jan 20, 2011
app pub date -
Apr 1, 2010
filing date -
Apr 3, 2009
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Abstract
Advantageous online and/or real-time OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. The apparatus, systems and methods employ a receiver with a bank of parallel branches, with each branch having a self-correlator matched to a different waveform scaling factor. A detection is declared when any of the branches leads to a correlation metric larger than a pre-defined threshold. The branch with the largest metric yields a Doppler scale estimate and a coarse synchronization point. The proposed apparatus, systems and methods use one OFDM preamble, thereby avoiding the need to buffer the whole data packet before data demodulation and enabling online and/or real-time operation. Thus, the disclosed apparatus, systems and methods are advantageously applicable to UWA communications.
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