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Cepstral nulling, one of the newest methods for smoothing the peri-odogram, amounts to turning to zero the cepstrum estimates whose magnitudes are smaller than a threshold. Up to now, the performance of various thresholding schemes was evaluated only empirically. In this paper, we analyze theoretically a slightly modified variant of a thresholding criterion which is based on Kolmogorov structure function...
Exploiting the received signals, which are usually not employed in the traditional OTH radar for ionospheric parameter estimation, we study joint estimation of target and ionospheric parameters for multiple-input multiple-output skywave OTH (MIMO-OTH) radar. We employ a parabolic layer model to characterize the ionospheric distortions. We model the target and ionospheric parameters as deterministic...
A box-particle filter (Box-PF) as a generalized particle filtering has a potential to process the measurements affected by bounded error of unknown distributions and biases. Inspired by the Box-PF, a novel implementation for multitarget tracking, called box-particle cardinality balanced multi-target multi-Bernoulli (Box-CBMeMBer) filter is presented in this paper. The approach can not only track multiple...
In this work, we study the upper bound of second order statistical correlation. We provide a condition for a random variable reaching the upper-bound, and an algorithm that transform any variable to have the maximum second order statistical correlation.
Acoustic signatures of aircraft engine and propeller noise are investigated in the context of target tracking. Harmonics in spectrograms of light airplanes collected by a stationary microphone array on the ground are analyzed. Using a model of Doppler frequency shifts, the target speed and height may be estimated from the spectrogram of recorded acoustic signal. These initial results highlight the...
We present an algorithm for jointly solving multiple nonorthogonal joint diagonalization (JNJD) problems with linked loading matrices, by using LU decomposition and Jacobi scheme in the updating procedure. The proposed method could be used in applications that involve a set of correlated linear instantaneous blind source separation (BSS) problems (e.g. frequency domain convolutive BSS), and differs...
Orthogonal waveform design is quite an important issue for waveform diversity systems. A chaos based method for orthogonal discrete frequency coding waveform (DFCW) design is proposed in this paper to overcome the insufficient orthogonal waveforms and their finite coding length. Correlation properties of the designed signals are analyzed. Premises for chaos choosing and frequency quantification method...
Ball bearing is one of the most easily damaged parts of rotating machinery. Envelope demodulation technique is one of the most effective methods for ball bearing early fault diagnosis. However, in the process of using the resonance demodulation technique, it is difficult to determine the resonant band which contains side band of bearing components failure characteristics. In order to resolve the issue,...
Lattice reduction aided decoding has been successfully used for signal detection in multiinput and multioutput (MIMO) systems and many other wireless communication applications. In this paper, we propose a novel enhanced Jacobi (short as EJacobi) method for lattice basis reduction. To assess the performance of the new EJacobi method, we compared it with the LLL algorithm, a widely used algorithm in...
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