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Coefficients a and b control the low and high frequency ranges that the watermark affects. Because of the watermark invariant properties, we embed the watermark only in the Fourier descr iptor magnitude. We use the inverse Fourier transform of the Fo
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A Bode plot is a graph of the transfer function of a linear, time-invariant system versus frequency, plotted with a log-frequency axis, to show the system s frequency response. It is usually a combination of a Bode magnitude plot, expressing the magn
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基于平移不变小波变换的多普勒速度声纳输出信号处理.针对水下航行器组合导航系统所使用的多普勒速度声纳输出信号的特点,采用了平移不变小波变换的多分辨率分析的方法,利用Daubechies小波函数,采用了半软阈值去噪的方法,能够在低信噪比的情况下准确地估计多普勒声纳的频移,从含有噪声的多普勒输出信号中提取出原始信号.通过仿真实验表明:采用4层小波分解,算法计算量减小,有效地消除多普勒噪声,从而提高水下组合导航系统的精度. -Doppler speed the sonar output signal p
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arious linear time-invariant electromagnetic systems are
most conveniently analyzed in the frequency domain
because there exist mature computational techniques (e.g.,
[1]) and related software (e.g., [2, 3]). Most measurements of
antennas and
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frequency offset invariant multiple symbol differential detection of MPSK.the objective is to design most robust receiver against random frequency variations.-frequency offset invariant multiple symbol differential detection of MPSK.the objective is
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详细画出了时域和频域的相关图，非归零型差分相位调制信号建模与仿真分析 ，结合PCA的尺度不变特征变换(SIFT)算法。- Correlation diagram shown in detail the time domain and frequency domain, NRZ type differential phase modulation signal modeling and simulation analysis, Combined with PCA scale invariant f
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包括 MUSIC算法，ESPRIT算法 ROOT-MUSIC算法，结合PCA的尺度不变特征变换(SIFT)算法，用于时频分析算法。- Including the MUSIC algorithm, ESPRIT algorithm ROOT-MUSIC algorithm, Combined with PCA scale invariant feature transform (SIFT) algorithm, For time-frequency analysis algorithm.
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