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Acoustic radiation force impulse (ARFI) imaging generates localized small displacements (typically less than 20 microns) in soft tissues and would induce shear waves. The shear wave speed (SWS), which is determined by the tissue elastic properties and can offer quantitative tissue stiffness, can be monitored from the displacement field. Therefore, precise tracking of small displacements is of great...
This paper was proposed a modified blind OFDM system parameters estimation method. The method was based on the periodicity of mobile autocorrelation function, and it estimated the OFDM symbol duration by using of the cyclic frequency test. Moreover, it limited the searching range of cyclic frequency which reduced the computational complexity. Simulation results show that the proposed time-parameter...
According to the definition of autocorrelation matrix (ACM), this paper was proposed a new autocorrelation matrix construction method. In comparison to traditional least square algorithm based on eigenvalue decomposition (LS-EVD), the presented method improved the estimation accuracy of eigenvalue. In addition, dividing signal subspace and noise subspace in a new method, which reduced the estimation...
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