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Apparatus, systems and methods for enhanced detection, synchronization and online Doppler scale estimation for underwater acoustic communications
Apparatus, systems and methods for enhanced detection, synchronization and online Doppler scale estimation for underwater acoustic communications
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机译:用于水下声通信的增强的检测,同步和在线多普勒比例估计的装置,系统和方法
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摘要
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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