Search results for "FAD"

showing 10 items of 292 documents

A non-stationary multipath fading channel model incorporating the effect of velocity variations of the mobile station

2014

A standard assumption in mobile fading channel modelling is that the mobile station (MS) moves along a straight line with constant speed. In practice, this assumption is violated in most propagation scenarios. For the development of more realistic channel models, it is therefore important to relax this restriction by allowing the MS to change its velocity. In this paper, we study the effect of velocity changes on the statistical properties of multipath fading channels. Expressions will be derived for the local autocorrelation function (ACF), the Wigner-Ville spectrum, the average Doppler shift, and the Doppler spread. Our findings show that a variation of the speed and/or the direction of t…

Computer sciencebusiness.industryAutocorrelationMathematical analysisSpectral densityFading distributionChannel state informationMobile stationFadingTelecommunicationsbusinessMultipath propagationComputer Science::Information TheoryRayleigh fadingCommunication channel2014 IEEE Wireless Communications and Networking Conference (WCNC)
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The Influence of LOS Components on the Statistical Properties of the Capacity of Amplify-and-Forward Channels

2009

Also available from publisher: http://dx.doi.org/10.4236/wsn.2009.11002 Amplify-and-forward channels in cooperative networks provide a promising improvement in the network coverage and system throughput. Under line-of-sight (LOS) propagation conditions in such cooperative networks, the overall fading channel can be modeled by a double Rice process. In this article, we have stud-ied the statistical properties of the capacity of double Rice fading channels. We have derived the analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level- crossing rate (LCR), and average duration of fades (ADF) of the channel capacity. The obtained results ar…

Computer sciencebusiness.industryCumulative distribution functionProbability density functionThroughputCommunications systemTopologysymbols.namesakeChannel capacityAmplitudeVDP::Technology: 500::Information and communication technology: 550::Telecommunication: 552symbolsFadingRayleigh scatteringTelecommunicationsbusinessComputer Science::Information TheoryWireless Sensor Network
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Performance evaluation of sum-of-cisoids Rice/Rayleigh fading channel simulators with respect to the bit error probability

2014

Sum-of-cisoids (SOC) processes provide an important framework for the modeling and simulation of multipath fading channels. In this paper, we analyze the performance of SOC Rice/Rayleigh narrowband fading channel simulators with respect to the bit error probability (BEP) of quadrature phase shift keying (QPSK) and differential phase shift keying (DPSK) systems with both coherent and noncoherent demodulation. For the BEP of coherent QPSK and DPSK, exact analytical expressions are derived, which provide insight into the influence of the number of propagation paths and the path gains on the system performance. It will be shown that at least 10 multipath components are required to guarantee tha…

Computer sciencebusiness.industryKeyingCondensed Matter PhysicsComputer Science::PerformanceNarrowbandGeneral Earth and Planetary SciencesDemodulationFadingElectrical and Electronic EngineeringTelecommunicationsbusinessAlgorithmMultipath propagationComputer Science::Information TheoryCommunication channelPhase-shift keyingRayleigh fadingRadio Science
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Modeling and statistical characterization of wideband indoor radio propagation channels

2010

In this paper, we focus on the modeling of wideband single-input single-output (SISO) mobile fading channels for indoor propagation environments. The derived indoor reference channel model is based on a geometrical scattering model, which consists of an infinite number of scatterers uniformly distributed over the two-dimensional (2D) horizontal plane of a rectangular room. We derive analytical expressions for the probability density function (PDF) of the angle of arrival (AOA), the power delay profile (PDP), and the frequency correlation function (FCF). An efficient sum-of-cisoids (SOC) channel simulator will be derived from the proposed non-realizable reference model. It is shown that the …

Computer sciencebusiness.industryProbability density functionData_CODINGANDINFORMATIONTHEORYPropagation delayCorrelation function (quantum field theory)Computer Science::Hardware ArchitectureAngle of arrivalElectronic engineeringFadingWidebandTelecommunicationsbusinessPower delay profileReference modelComputer Science::Information TheoryInternational Congress on Ultra Modern Telecommunications and Control Systems
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Cooperative compressive power spectrum estimation in wireless fading channels

2017

This paper considers multiple wireless sensors that cooperatively estimate the power spectrum of the signals received from several sources. We extend our previous work on cooperative compressive power spectrum estimation to accommodate the scenario where the statistics of the fading channels experienced by different sensors are different. The signals received from the sources are assumed to be time-domain wide-sense stationary processes. Multiple sensors are organized into several groups, where each group estimates a different subset of lags of the temporal correlation. A fusion centre (FC) combines these estimates to obtain the power spectrum. As each sensor group computes correlation esti…

Computer sciencebusiness.industrycorrelation lagSub-Nyquist samplingEstimatorSpectral densityfading020206 networking & telecommunicationsmulticoset sampling02 engineering and technologypower spectrumSignalwide-sense stationarycooperative estimationComputer Science::Networking and Internet Architecture0202 electrical engineering electronic engineering information engineeringWireless020201 artificial intelligence & image processingFadingUniquenessNyquist ratebusinessAlgorithmWireless sensor network2017 International Conference on Electrical Engineering and Informatics (ICELTICs)
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The histone deacetylase inhibitor suberoylanilide hydroxamic acid sensitizes human hepatocellular carcinoma cells to TRAIL-induced apoptosis by TRAIL…

2009

Abstract This paper shows that the histone deacetylase inhibitor SAHA sensitised at sub-toxic doses human hepatocellular carcinoma cells (HepG2, Hep3B and SK-Hep1) to TRAIL-induced apoptosis, while it was ineffective in primary human hepatocytes (PHHs). In particular in HCC cells SAHA increased the expression of death receptor 5 (DR5) and caused a decrement of c-Flip. These two modifications provoked in the presence of TRAIL the rapid production of TRAIL-DISC and the activation of caspase-8. Consequently SAHA/TRAIL combination induced many apoptotic events, such as a cleavage of Bid into tBid, dissipation of mitochondrial membrane potential, activation of caspase-3 with the consequent cleav…

Death Domain Receptor Signaling Adaptor ProteinsCancer Researchmedicine.medical_specialtyProgrammed cell deathCarcinoma Hepatocellularmedicine.drug_classmedicine.medical_treatmentBlotting WesternCASP8 and FADD-Like Apoptosis Regulating ProteinDown-RegulationAntineoplastic AgentsApoptosisBiologyHydroxamic AcidsHDACI TRAIL apoptosisInternal medicineSettore BIO/10 - BiochimicamedicineHumansProtein kinase BVorinostatLiver NeoplasmsHistone deacetylase inhibitorNF-kappa Bmedicine.diseaseReceptors TNF-Related Apoptosis-Inducing LigandCytokineEndocrinologyOncologyDrug Resistance NeoplasmApoptosisHepatocellular carcinomaCancer researchTumor necrosis factor alphaSignal transductionProto-Oncogene Proteins c-akt
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CD95 death-inducing signaling complex formation and internalization occur in lipid rafts of type I and type II cells

2004

We investigated the membrane localization of CD95 in type I and type II cells, which differ in their ability to recruit and activate caspase-8. We found that CD95 was preferentially located in lipid rafts of type I cells, while it was present both in raft and non-raft plasma membrane sub-domains of type II cells. After stimulation, CD95 located in phospholipid-rich plasma membrane was recruited to lipid rafts in both types of cells. Similarly, CD95 cross-linking resulted in caspase-independent translocation of FADD/MORT1 and caspase-8 to the lipid rafts, which was prevented by a death domain-defective receptor. CD95 internalization was then rapid in type I and delayed in type II cells and s…

Death Domain Receptor Signaling Adaptor ProteinsEndosomeT-Lymphocytesmedia_common.quotation_subjectImmunologyApoptosisReceptors Tumor Necrosis FactorCell LineMembrane MicrodomainsSettore MED/04 - PATOLOGIA GENERALECell Line TumorReceptorsHumansImmunology and Allergyfas ReceptorFADDInternalizationLipid raftLipid raftsDeath domainmedia_commonTumorbiologyVesicleFas receptorEndocytosisCell biologyProtein TransportCholesterolCD95 death-inducing signaling complexCaspasesCD95biology.proteinlipids (amino acids peptides and proteins)biological phenomena cell phenomena and immunityCaspase-8Tumor Necrosis FactorCaspase-8; CD95; Lipid rafts; Apoptosis; Caspases; Cell Line Tumor; Cholesterol; Death Domain Receptor Signaling Adaptor Proteins; Humans; Membrane Microdomains; Protein Binding; Protein Transport; Receptors Tumor Necrosis Factor; T-Lymphocytes; fas Receptor; Endocytosis; Signal Transduction; Immunology and Allergy; ImmunologyProtein BindingSignal TransductionEuropean Journal of Immunology
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Numerical and experimental analysis of a pegs-wing ventilated disk brake rotor, with pads and cylinders

2005

Disk brake rotor pads caliper finite elements thermal stress fading testing procedure
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Three-body approach to proton-hydrogen charge exchange and elastic scattering

1999

The impact-parameter Faddeev approach to atomic three-body collisions which has been developed for, and successfully applied to, ion-atom scattering processes, has now been developed further by including, instead of the Coulomb potentials, the full two-particle off-shell Coulomb {ital T} matrices in all {open_quotes}triangle{close_quotes} contributions to the effective potentials. Results of calculations of proton-hydrogen collisions with only the ground states of the hydrogen retained in both the direct and the rearrangement channels are presented. Total and differential electron transfer, as well as differential elastic scattering cross sections, are obtained simultaneously in very good a…

Elastic scatteringPhysicsFaddeev equationsRange (particle radiation)ProtonScatteringTransfer-matrix method (optics)CoulombAtomic physicsThree-body problemAtomic and Molecular Physics and Optics
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The performance of the INLSA in comparison with the ESPRIT and SAGE algorithms

2014

In this paper we investigate the application potential of three known algorithms, namely the ESPRIT, SAGE and INLSA, to properly emulate the statistical properties of the mobile fading channel. The performance comparisons of those methods will be carried out with respect to their fitting accuracy to the autocorrelation function (ACF) of the reference model. The methods' accuracy will be assessed in the synthetic reference channel model, which is based on the sum-of-cisoids (SOC) principle. In our reference model, we consider the scenarios with equal gains and Rayleigh distributed gains. The obtained results indicate that in both scenarios the INLSA method is more preferable than the ESPRIT …

EmulationComputer scienceAutocorrelationFadingData_CODINGANDINFORMATIONTHEORYChannel modelsAlgorithmReference modelComputer Science::Information TheoryCommunication channel2014 International Conference on Advanced Technologies for Communications (ATC 2014)
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