Search results for " Channel model"

showing 10 items of 13 documents

Interchannel Interference and Mitigation in Distributed MIMO RF Sensing

2021

In this paper, we analyze and mitigate the cross-channel interference, which is found in multiple-input multiple-output (MIMO) radio frequency (RF) sensing systems. For a millimeter wave (mm-Wave) MIMO system, we present a geometrical three-dimensional (3D) channel model to simulate the time-variant (TV) trajectories of a moving scatterer. We collected RF data using a state-of-the-art radar known as Ancortek SDR-KIT 2400T2R4, which is a frequency-modulated continuous wave (FMCW) MIMO radar system operating in the K-band. The Ancortek radar is currently the only K-band MIMO commercial radar system that offers customized antenna configurations. It is shown that this radar system encounters th…

Computer science3D channel modelMIMOVDP::Informasjons- og kommunikasjonsteknologi: 550Data_CODINGANDINFORMATIONTHEORYTP1-1185Interference (wave propagation)BiochemistryVDP::Information and communication technology: 550ArticleAnalytical Chemistrylaw.inventionmillimeter wave (mm-Wave)lawElectronic engineeringElectrical and Electronic EngineeringRadarInstrumentationsensor networkComputer Science::Information Theoryinterchannel interferencedistributed MIMOmicro-Doppler signaturesChemical technologyPropagation delayAtomic and Molecular Physics and OpticsRF sensingVDP::Teknologi: 500Extremely high frequencyFMCWRadio frequencyAntenna (radio)Wireless sensor networkSensors
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The effect of body shape and gender on wireless Body Area Network on-body channels

2010

Technological advancements have made possible the emergence of Body Area Networks (BANs). There are numerous on-body channel characterizations in the literature performed on a phantom or a single human subject. In this paper, using multiple subjects, we consider the effect of body shape and gender on the on-body channel. A characterization of a narrowband on-body to on-body channel among different subjects is presented. The paper investigates the relationship between the propagation and the subject's physical characteristics. The investigation is performed at 2360 MHz; the new medical band undergoing FCC approval. Our results show that the path loss in women is less than that in men and the…

GeographyNarrowbandSettore ING-INF/03 - TelecomunicazioniStatisticsBody area networkElectronic engineeringPath lossFadingAntenna measurements Antennas and propagation Body area networks Channel models Fading Shape Wireless sensor networks Body Area Networks Body shape Channel characterization Channel propagation IEEE802.15.6. Wireless Sensor NetworksWireless sensor networkImaging phantomRice distributionCommunication channel
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Statistical Properties of Double Hoyt Fading With Applications to the Performance Analysis of Wireless Communication Systems

2018

In this paper, we investigate the statistical properties of double Hoyt fading channels, where the overall received signal is determined by the product of two statistically independent but not necessarily identically distributed single Hoyt processes. Finite-range integral expressions are first derived for the probability density function (PDF), cumulative distribution function (CDF), level-crossing rate (LCR), and average duration of fades of the envelope fading process. A closed-form approximate solution is also deduced for the LCR by making use of the Laplace approximation theorem. Applying the derived PDF of the double Hoyt channel, we then provide analytical expressions for the average…

Independent and identically distributed random variablesGeneral Computer ScienceGaussianProbability density function02 engineering and technologyDouble Hoyt fading channel modelsymbols.namesake0202 electrical engineering electronic engineering information engineeringGeneral Materials ScienceFadingGaussian processMathematicsComputer Science::Information TheoryCumulative distribution function020208 electrical & electronic engineeringMathematical analysisGeneral Engineering020206 networking & telecommunicationsvehicular-to-vehicular (V2V) channelsLaplace's methodprobability density function (PDF)symbolsaverage duration of fades (ADF)cumulative distribution function (CDF)lcsh:Electrical engineering. Electronics. Nuclear engineeringlevel-crossing rate (LCR)lcsh:TK1-9971Quadrature amplitude modulationIEEE Access
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Opportunistic traffic Offloading Mechanisms for Mobile/4G Networks

2015

LTEOffloading Channel modellingSettore ING-INF/03 - Telecomunicazionibusiness.industryComputer scienceSmall cellMobile data offloadingbusinessComputer networkProceedings of the 2015 on MobiSys PhD Forum
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Correlated Channel Model for terrestrial Free Space Optics and project specifications evaluation of LT code in OOK modulation

2011

Free Space Optics is a wireless line-of-sight communication system able to offer good bandwidth performance as well as straightforward installation and relocation. So that it represents a modern technology that allow to realize large bandwidth communication particularly when it is not possible to employ physical cable or radio technologies. Examples of FSO applications are: wireless backaul, fiber backup, temporary links, metro network extension and last mile access[1]. FSO is based on optical signals propagation in air and that is why it suffers of impairments which depend on atmospheric conditions. In detail, FSO suffers of scattering (i. e. Rayleigh and Mie) losses, absorption and scinti…

Settore ING-INF/02 - Campi ElettromagneticiFree Space Optics FSO OOK LT code Luby Tranform Channel model correlation outage Gamma Gamma Rytov parameterSettore ING-INF/01 - Elettronica
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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Correlated channel model for terrestrial Free Space Optics: performance analysis of rateless codes

2012

We describe a novel correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by scintillation. With regards to the same channel, we also report simulation results on the error mitigation performance of Luby-Transform and Raptor codes.

Settore ING-INF/03 - TelecomunicazioniFree Space Optics channel modeling Raptor codes RaptorQ codes LT codes rateless codesSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Luby Transform Performance Tests on Time-Correlated Channel Model for Geo Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniSettore ING-INF/01 - ElettronicaFree Space Optics Luby Transform Codes Rateless Codes Channel Modeling Geo Free Space Optics Downlinks
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Performance Investigation of Fountaine Codes on a Simulated Terrestrial Free Space Optical Channel

2012

Settore ING-INF/03 - TelecomunicazioniSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - ElettronicaFree Space Optics Channel Modeling Fountain Codes Raptor Codes RaptorQ Codes Luby Transform Codes Rateless Codes
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Optical wireless GEO satellite-to-ground downlinks: rateless codes as solution for scintillation fading

2013

Scintillation fading can corrupt a satellite-to-ground optical wireless links with burst errors. Rateless codes, suitable for erasure channel, are able to eliminate or to reduce these communication errors. We analyzed the performances of three different rateless codes in a simulated Geo satellite-to-ground downlink.

Settore ING-INF/03 - TelecomunicazioniSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - ElettronicaFree Space Optics Rateless codes LT codes Raptor codes RaptorQ codes channel modeling
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