نتایج جستجو برای: آشکارساز csi

تعداد نتایج: 6219  

Journal: :Scientific American 2006
Max M Houck

2011
Mohammad Osmani-Bojd Assadallah Sahebalam Ghosheh Abed Hodtani

In this paper, we derive a capacity region for Gaussian fading multiple access degraded relay channel with partial channel state information (CSI) at the transmitters (CSIT) and perfect CSI at the receiver (CSIR). The achievable rate region obtained by Kramer-Wijngaarden is a special case of our region. Keywords-Gaussian fading channel; channel state information (CSI); discrete multiple access ...

2001
M Stoneham

Calculations are performed on several aspects of the luminescence of pure CsI and CsI: Na. These include electronic-structure calculations by both pseudopotential and semiempirical molecular-orbital methods, as well as lattice-configuration studies. The results suggest that the main observed emission in CsI: Na at 2.95 eV involves the recombination of a self-trapped exciton immediately adjacent...

Journal: :Cytometry. Part A : the journal of the International Society for Analytical Cytology 2004
Jeremy M Lerner Robert M Zucker

BACKGROUND Confocal spectral imaging (CSI) microscopic systems currently on the market delineate multiple fluorescent proteins, labels, or dyes within biological specimens by performing spectral characterizations. However, some CSI systems have been found to present inconsistent spectral profiles of reference spectra within a particular system and between related and unrelated instruments. This...

Journal: :Anesthesia and analgesia 2008
Ricardo Fuentes Luis I Cortínez Michel M R F Struys Alejandro Delfino Hernán Muñoz

BACKGROUND To guide anesthetic administration with electroencephalogram monitors in children, an adequate characterization of the anesthetic effect measured by these monitors in this population is needed. We sought to quantify and compare the dynamic profile of sevoflurane's effect measured with the cerebral state index (CSI) and the bispectral index (BIS) in children. METHODS Fifteen healthy...

2010
Daan Fierens

There is currently a large interest in relational probabilistic models. While the concept of context-specific independence (CSI) has been well-studied for models such as Bayesian networks, this is not the case for relational probabilistic models. In this paper we show that directed relational probabilistic models often exhibit CSI by identifying three different sources of CSI in such models (tw...

2009
Alan Coley Sigbjørn Hervik Nicos Pelavas N. Pelavas

In this paper we investigate four dimensional Lorentzian spacetimes with constant curvature invariants (CSI spacetimes). We prove that if a four dimensional spacetime is CSI , then either the spacetime is locally homogeneous or the spacetime is a Kundt spacetime for which there exists a frame such that the positive boost weight components of all curvature tensors vanish and the boost weight zer...

2001
Francesc Rey Meritxell Lamarca Gregori Vázquez

Closed-loop schemes optimizing power allocation can be applied if Channel Status Information (CSI) is available at both transmitter and receiver. However, CSI is never ideal and algorithms performance degrades rapidly when CSI is poor. In this contribution a MMSE cost function that takes into account channel uncertainty is proposed for MIMO systems with OFDM modulation. The derived algorithm is...

2005
Ranjan K. Mallik Parul Garg

Abstract — For a space-time coded system in a correlated Rayleigh fading environment, we consider two receiver structures: (1) a suboptimum one in which the imperfect channel state information (CSI) is used in place of perfect CSI in a perfect CSI optimum receiver, (2) the optimum receiver in which the imperfect CSI is used in the maximum likelihood sense. Channel estimation is done by the use ...

2005
Clark Evans

Conditional slantwise instability (CSI) is observed to occur in saturated, statically stable atmospheres where the horizontal wind increases in magnitude and veers with height. A complete background on CSI may be found in the compendium by Schultz and Schumacher (1999). Numerous studies in the midlatitudes (e.g. Sanders and Bosart 1985, Moore and Blakely 1988, Weismueller and Zubrick 1998) have...

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