Bistatic SAR data are more complicated to process than monostatic data because of the versatile sensor geometry and the non-stationary properties of the received data. Recent approaches to the processing of bistatic SAR data have revolved around finding an accurate representation of the two-dimensional spectrum for a point target. In this paper, we review past methods of obtaining the spectrum,...

This paper describes a new method of accurately estimating the parameters of an autoregressive (AR) process contaminated by high-level white noise. Based on the phase matching technique, it minimizes the difference between the phase of the all-zero model and the phase of the maximum phase signal reconstructed from the power spectrum of the observed signal. The parameters of the AR model are obt...

we define a new type of spectrum, called δ-approximate spectrum, of an element a in a complex unital banach algebra a and show that the δ-approximate spectrum σ_δ (a) of a is compact. the relation between the δ-approximate spectrum and the usual spectrum is investigated. also an analogue of the classical gleason-kahane-zelazko theorem is established: for each ε>0, there is δ>0 such that if ϕ is...

We report line-by-line control of a coherent discrete spectrum (Raman sidebands) with a frequency spacing of 10.6 THz that is produced by an adiabatic Raman process. We show that the spectral phase of the Raman sidebands is finely controlled to the target (flat relative-spectral-phase). This is achieved by employing a combination of a spatial phase controller and a spectral interferometer, whic...

In this paper, we investigate the influence of the carrier phase jitter of a phase-locked local oscillator on the performance of a multi-carrier code-division multipleaccess (MC-CDMA) system in a non-dispersive channel. This carrier phase jitter degrades the signal-to-noise ratio at the input of the decision device. When all users have the same power level and phase jitter spectrum, it is shown...

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   In this research Fe-TiO2 nanocomposites with different molar ratios of Fe/Ti were prepared as nano-photocatalyst using a modified Sol-Gel process at ambient temperature. Crystallographic properties of nanocomposites were characterized by X-ray Diffraction (XRD). Surface morphology and mean particle size of nanocomposites were specified by Field Emission Scann...

In many speech processing applications, the spectral amplitude is the dominant information while the use of phase spectrum is not so widely spread. In this paper, we present an overview on why speech phase spectrum has been neglected in the conventional techniques used in different applications including: speech separation/enhancement, automatic speech and speaker recognition and speech synthes...

This paper aims to investigate potentials existing in speech phase spectrum. We observed that the window shape and scale incompatibility error (SIE) are two important factors which deeply influence the quality of phase-only reconstructed speech. After evaluating effects of different windows, we found Chebyshev window with dynamic range of 25 to 30 dB the best option. Inspiring from Hilbert tran...