Real world face recognition implies that the scene images are embedded in noise and mix with additive noise. Former works prove that phase input joint transform correlators have better detection efficiency than the amplitude ones. One of these models, the preprocessed phase input joint transform correlator, has the best detection efficiency and its setup parameters are: the amplitude premodulat...

Orthogonal frequency-division multiplexing (OFDM) baseband signals may be modeled by complex Gaussian processes with Rayleigh envelope distribution and uniform phase distribution, if the number of carriers is sufficiently large. The output correlation function of instantaneous nonlinear amplifiers and the signal-to-distortion ratio can be derived and expressed in an easy way. As a consequence, ...

We report here on a quartz-enhanced photoacoustic (QEPAS) sensor employing a quantum cascade laser (QCL) structure capable of operating in a pure amplitude or wavelength modulation configuration. The QCL structure is composed of three electrically independent sections: Gain, Phase (PS) and Master Oscillator (MO). Selective current pumping of these three sections allows obtaining laser wavelengt...

We present an overview of the bimodal amplitude-frequency-modulation (AM-FM) imaging mode of atomic force microscopy (AFM), whereby the fundamental eigenmode is driven by using the amplitude-modulation technique (AM-AFM) while a higher eigenmode is driven by using either the constant-excitation or the constant-amplitude variant of the frequency-modulation (FM-AFM) technique. We also offer a com...

Propeller cavitation noise in the high frequency regime is broadband and yet audibly rhythmic. The study of these processes are important because the shaft and blade rates, as well as other identifying features of the ship, can in principle be inferred from propeller noise modulation characteristics. Conventional wisdom has been that propeller noise is an amplitude modulation of a wide sense st...

5 To be submitted to Paleoceanography. The accuracy of geologic chronologies can, in principle, be improved through 6 orbital tuning, the systematic adjustment of a chronology to bring the as-7 sociated record into greater alignment with an orbitally derived signal. It would 8 be useful to have a general test for the success of orbital tuning, and one pro-9 posal has been that eccentricity ough...

This paper studies performances of ultra wideband (UWB) communication systems in AWGN channel. The studied UWB systems are utilizing different kinds of modulation schemes. The propagating information signal is jammed with a signal having a spectrum in the UMTS or in the GSM band. The simulations showed that the time hopping UWB system utilizing binary PAM modulation outperforms the other studie...

Modulation techniques have attracted increasing attention in optical wireless communications. Basic schemes such as on off keying (OOK), pulse amplitude modulation (PAM) and pulse position modulation (PPM) have been validated as suitable for the optical wireless channel. This paper starts from the analysis of these three modulation schemes in terms of their power and bandwidth requirements. As ...

Insulin is secreted in a pulsatile manner from multiple micro-organs called the islets of Langerhans. The amplitude and phase (shape) of insulin secretion are modulated by numerous factors including glucose. The role of phase modulation in glucose homeostasis is not well understood compared to the obvious contribution of amplitude modulation. In the present study, we measured Ca2+ oscillations ...

Introduction: During the last years, Spatially Selective Excitation (SSE) has become practicable in combination with parallel RF transmission. SSE applications like inner-volume imaging (IVI) [1] or targeted spectroscopy [2] utilize the possibility to restrict the generation of transverse magnetization MT to specified target volumes by spatial amplitude modulation according to a given target pa...