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• W2003816095 abstract "Covert communications are conducted at a low received signal-to-noise ratio (SNR) to prevent interception or detection by an eavesdropper, and successful detection in this particular area heavily relies on the processing gain achieved by employing the direct-sequence spread-spectrum (DSSS) technique. If covert communications take place in underwater acoustic (UWA) environments, then additional challenges are present. UWA channels are time-varying in nature, which could preclude an accurate channel estimation at low SNR. Furthermore, UWA environments are frequency-selective with long-memory channels, which imposes challenges to the design of the spreading waveform. In this paper, we investigate covert UWA communications from a noncoherent perspective. Two modulation schemes are addressed, namely, binary orthogonal modulation and binary differential phase-shift keying (DPSK). Both schemes are coupled with the DSSS technique and a RAKE receiver. The employed spreading waveforms not only account for the transceiver structure and frequency-selective nature of the UWA channel, but also serve to protect the privacy of the transmitted information. The effectiveness of the proposed methods is verified by numerical examples." @default.
• W2003816095 created "2016-06-24" @default.
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• W2003816095 date "2010-09-01" @default.
• W2003816095 modified "2023-09-25" @default.
• W2003816095 title "Covert underwater acoustic communications: Transceiver structures, waveform designs and associated performances" @default.
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• W2003816095 doi "https://doi.org/10.1109/oceans.2010.5663840" @default.
• W2003816095 hasPublicationYear "2010" @default.
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