نتایج جستجو برای: compression spectrum

تعداد نتایج: 313008  

2018
Min Jia Zhiying Wu Zhisheng Yin Qing Guo Xuemai Gu

With the rapid development of wireless communication, the spectrum resource becomes rare, and research on utilization of limited spectrum resource becomes more popular, especially in fifth generation (5G) mobile communication system. Some efficient frequency division multiplexing systems, such as spectrally efficient frequency division multiplexing (SEFDM) system, can improve spectrum utilizati...

  In this work, the effects of inner radius and width variation on energy spectrum and persistent current in hexagonal graphene quantum rings with zigzag edges have been studied by using the tight-binding model. Our investigation show that the energy spectra of these rings are grouped into subbands which each one consists of six coupled energy levels that separated by energy gaps. The pattern o...

2008
W. M. Macek

Within the complex dynamics of the solar wind’s fluctuating plasma parameters, there is a detectable, hidden order described by a chaotic strange attractor which has a multifractal structure. The multifractal spectrum has been investigated using Voyager (magnetic field) data in the outer heliosphere and using Helios (plasma) data in the inner heliosphere. We have also analyzed the spectrum for ...

شاه‌بیک, شریف, صفر نژاد زنده‌جان, محمد, کامزا, میعاد,

In this paper, Lattice-Discrete Particle Model (LDPM) of concrete has been extended in 2-D to account for the effect of non-circular aggregates. To this end, the flexible equation of super-ellipse is employed for generating aggregates in order to add the simulation possibility of a greater spectrum of aggregate samples in 2-D to lattice-Discrete particle Model. Alongside this extention, require...

2012
Albert Lin

The image data compression is very important to reduce the image data volume and data rate for the satellite remote sensing. The chapter describes how the image data compression hardware is implemented and uses the FORMOSAT-5 Remote Sensing Instrument (RSI) as an example. The FORMOSAT-5 is an optical remote sensing satellite with 2 meters Panchromatic (PAN) image resolution and 4 meters Multi-S...

2009
Jan Rennies Jesko L. Verhey Josef Chalupper Hugo Fastl

Recent studies have shown that spectral loudness summation depends on duration. Modifications of a current loudness model were investigated with respect to their ability to predict this effect. The original version of the model could not simulate the duration dependence of spectral loudness summation. To reconcile the model with the loudness data, three different mechanisms accentuating tempora...

Journal: :IEEE Trans. Geoscience and Remote Sensing 1998
Ashok S. Mudukutore V. Chandrasekar R. Jeffrey Keeler

Wideband waveform techniques, such as pulse compression, allow for accurate weather radar measurements in a short data acquisition time. However, for extended targets such as precipitation systems, range sidelobes mask and corrupt observations of weak phenomena occurring near areas of strong echoes. Therefore, sidelobe suppression is extremely important in precisely determining the echo scatter...

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