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Due to the power consumption and hardware implementation cost limitation, hybrid analog and digital precoding is a promising candidate for millimeter wave (mmWave) large-scale multiple-input multiple-output (MIMO) systems. Most of the prior work on hybrid beamforming considers frequency-flat channels. However, in practice, thanks to the large amount of available spectral resource, mmWave communication...
In this paper, a novel covariance spectrum sensing approach used in cognitive radio (CR) networks which is based on the dynamical stochastic resonance (SR) technique is proposed. When the optimal SR technique is introduced as the pre-processing method for the covariance-based detection and after it has been realized, it can increase the signal-to-noise ratio (SNR) of the primary user (PU) signal and...
Understanding and cognition on characteristics of earthquake ground motion is the foundation and precondition of structural response analysis. Traditional Fourier amplitude spectrum and power spectral density(PSD) representations based on Fourier transform have limitations, that is, it loses any information related to time and is unable to completely reflect the non-stationary characteristics of earthquake...
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