This paper proposes a new methodology for subspace identification of linear time-periodic (LTP) systems with periodic inputs. method overcomes the issues related to computation frequency response LTP by utilizing time-lifted system time-invariant structure instead. The is estimated an ensemble input-output data allows frequency-domain technique be extended systems. time-aliased impulse can then...

Abstract. We present a solver for the 2D high-frequency Helmholtz equation in heterogeneous, constant density, acoustic media, with online parallel complexity that scales empirically as O(NP ), where N is the number of volume unknowns, and P is the number of processors, as long as P = O(N1/5). This sublinear scaling is achieved by domain decomposition, not distributed linear algebra, and improv...

An entropy based decomposition technique is applied to some wide-band polarimetric data sets acquired under fully controlled conditions. The measured targets include various tree types and maize plants. The acquired data are analyzed firstly by displaying the loci of the Entropy-Alpha pairs both as a function of the working frequency and the incidence angle. This analysis shows which are the do...

We consider the line spectral estimation problem which aims to recover a mixture of complex sinusoids from a small number of randomly observed time domain samples. Compressed sensing methods formulates line spectral estimation as a sparse signal recovery problem by discretizing the continuous frequency parameter space into a finite set of grid points. Discretization, however, inevitably incurs ...

The fast nearfield method, when combined with time-space decomposition, is a rapid and accurate approach for calculating transient nearfield pressures generated by ultrasound transducers. However, the standard time-space decomposition approach is only applicable to certain analytical representations of the temporal transducer surface velocity that, when applied to the fast nearfield method, are...

A low-complexity pilot pattern and a frequency-domain channel estimation method for Inter-Carrier Interference (ICI) mitigation is proposed Orthogonal Frequency Division Multiple Access (OFDM) systems. The exploits the band structure of coupling matrix to perform an ICI-free in frequency domain. This relies on some conditions imposed over that simplify complexity significantly, since its same a...

According to the disadvantages of former shearer cutting load measuring method and its low antiinterference ability, this paper proposes a new shearer cutting load measuring method based on the current spectrum. On the basis of load analysis of shearer cutting unit drive system, the theoretical models are established between cutting load and cutting motor current. Simulated load test to the ele...

When a linear transport equation contains two scales, one diffusive and the other non-diffusive, it is natural to use a domain decomposition method which couples the transport equation with a diffusion equation with an interface condition. One such method was introduced by Golse, Jin and Levermore in [11], where an interface condition, which is derived from the conservation of energy density, w...

Seismic waves are non-stationary due to its propagation through the earth. Time-frequency transforms are suitable tools for analyzing non-stationary seismic signals. Spectral decomposition can reveal the non-stationary characteristics which cannot be easily observed in the time or frequency representation alone. Various types of spectral decomposition methods have been introduced by some resear...