نتایج جستجو برای: chirp signal

تعداد نتایج: 420128  

Journal: :JCM 2013
Wei Zhang Ying Xiong Pei Wang Bin Tang

Recent work has proposed a certainty trend (CT) elimination technique employed for the auto-regressive/autoregressive and moving-average (AR/ARMA) model pulse position prediction. In this paper, we investigate the intra pulse parameter estimation and pulse position prediction of the chirp and stochastic pulse position modulation (CSPPM) combined signal. The quick dechirp method is adopted to th...

2004
Baris Bozkurt Thierry Dutoit Boris Doval Christophe d'Alessandro

This study presents an improved version of our previously introduced formant tracking algorithm. The algorithm is based on processing the negative derivative of the argument of the chirp-z transform (termed as the differential phase spectrum) of a given speech signal. No modeling is included in the procedure but only peak picking on differential phase spectrum. We discuss the effects of roots o...

2007
M J Benacquista S L Larson B E Taylor

Using several realisations of the Galactic population of close white dwarf binaries, we have explored the selection bias for resolved binaries in the LISA data stream. We have assumed a data analysis routine that is capable of identifying binaries that have a signal to noise ratio of at least 5 above a confusion foreground of unresolved binaries. The resolved population of binaries is separated...

Journal: :Optics express 2013
Dar-Zu Hsu Chia-Chien Wei Hsing-Yu Chen Yi-Cheng Lu Cih-Yuan Song Chih-Chieh Yang Jyehong Chen

We develop a novel subcarrier-to-subcarrier intermixing interference (SSII) cancellation technique to estimate and eliminate SSII. For the first time, the SSII cancellation technique is experimentally demonstrated in an electro-absorption modulator- (EAM-) based intensity-modulation-direct-detection (IMDD) multi-band OFDM transmission system. Since the characteristics of SSII are seriously affe...

2011
W. Zhai

It is well-known that the stepped-frequency chirp signal (SFCS) technique is one of the very effective approaches for achieving high range resolution in radar [1–5]. The SFCS is a train of subchirp pulses with up-stepped or down-stepped carrier frequencies. However, there exists a rang-Doppler coupling problem (RDCP) when applying this signal to practical radar system because longer time is nee...

2007
Adele B. Doser

A new time/frequency technique is developed to characterize dispersed signals in the joint time/scale domain. Specifically, we are interested in pulses that become dispersed by transmission through the ionosphere and are manifested as nonlinear chirps. Due to low signal-to-noise ratios, it is difficult to isolate these signals in the time or frequency domain. Due to computational complexity, it...

2010
Yogesh S Angal

--The fractional fourier transform(FRFT) which is a generalisation of classical fourier transform, was introduced number of years ago in the mathematics literature but appears to have remained largely unknown to a signal processing community to which it may, however, be a potentially useful. The fractional fourier transform depends on a parameter ‘α’ and can be interpreted as a rotation by an a...

Journal: :Optics express 2003
Selcuk Akturk Mark Kimmel Patrick O'Shea Rick Trebino

We show that the spatio-temporal distortion, spatial chirp, is naturally and easily measured by single-shot versions of second-harmonic generation frequency-resolved optical gating (SHG FROG) (including the extremely simple version, GRENOUILLE);. While SHG FROG traces are ordinarily symmetrical, a pulse with spatial chirp yields a trace with a shear that is approximately twice the pulse spatial...

Journal: :The Journal of Korean Institute of Electromagnetic Engineering and Science 2009

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