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The deconvolution of multipath underwater acoustic channel with a large time-delay spread is investigated. The channel deconvolution involves estimating the multipath time-delays and attenuation factors from a noisy received signal consisting of multiple overlapped signals. Similar to conventional deconvolution methods, the proposed method estimates channel(More)
OBJECTIVES Whether syphilis influences lymphocyte apoptosis has not been reported so far. GOAL The goals of this study were to determine whether syphilis influences lymphocyte apoptosis and to investigate the molecular mechanism of apoptosis. STUDY DESIGN Peripheral blood lymphocyte (PBL) immunophenotypes, apoptosis, and expression of Fas (CD95) and(More)
In this paper, a new algorithm for high-resolution multiple wideband and nonstationary source localization using a sensor array is proposed. The received signals of the sensor array are first converted into the time-frequency domain via short-time Fourier transform (STFT) and we find that a set of short-time power spectrum matrices at different time(More)
A family of algorithms, named &#x2113;<sub>p</sub>-MUSIC, for direction-of-arrival (DOA) estimation in impulsive noise is proposed. The &#x2113;<sub>p</sub>-MUSIC estimator adopts the &#x2113;<sub>p</sub>-norm (1 &#x2264; p 2) of the residual fitting error matrix as the objective function for subspace decomposition, rather than the Frobenius norm that is(More)
The estimation of doubly spread underwater acoustic channels is addressed. By exploiting the sparsity in the delay-Doppler domain, this paper proposes a fast projected gradient method (FPGM) that can handle complex-valued data for estimating the delay-Doppler spread function of a time-varying channel. The proposed FPGM formulates the sparse channel(More)
Most of the existing beamforming methods are based on the Minimum Variance (MV) criterion. The MV approach is statistically optimal only when the signal, interferences and the noise are Gaussian-distributed. However, non-Gaussian signals arise in a variety of practical applications. In this paper, Minimum Dispersion Distortionless Response (MDDR)(More)