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Automatic estimation of symbol parameters plays a prominent role in electronic reconnaissance and electronic warfare systems. How to estimate the code width without prior knowledge is an important problem in modulation recognition. Hilbert transform can effectively extract the instantaneous mutation characteristics of digital communication signals. In this paper, in order to demodulate MPSK underwater...
Compressed sensing is a new method of data acquisition and processing, which can accurately restore the original data from a few observation samples. In this paper, based on this theoretical framework, the compressed sensing reconstruction algorithm named Discrete Fourier transform Matching Pursuit algorithm (DFT-MP) were proposed for sparse channel estimation. It is suitable for sparse underwater...
Based on double DCT transform, an audio digital watermarking algorithm was proposed and transmitted via air channel. The low-frequency coefficients in DCT domain were chosen for the second DCT transform. Using the method of modifying the coefficients in double DCT domain, the watermarking and synchronization signal was embedded into the original audio carrier and with large watermarking capacity....
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