Search results for "Mobile station"

showing 10 items of 40 documents

A Geometrical Channel Model for MIMO Mobile-to-Mobile Fading Channels in Cooperative Networks

2009

This paper deals with the modeling and analysis of narrowband multiple-input multiple-output (MIMO) mobile- to-mobile (M2M) fading channels in relay-based cooperative networks. Non-line-of-sight (NLOS) propagation conditions are assumed in the transmission links from the source mobile station to the destination mobile station via the mobile relay. A stochastic narrowband MIMO M2M reference channel model is derived from the geometrical three-ring scattering model, where it is assumed that an infinite number of local scatterers surround the source mobile station, the mobile relay, and the destination mobile station. The complex channel gains associated with the new reference channel model are…

3G MIMOCommunication channelsSpatial correlationEngineeringbusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSMIMOData_CODINGANDINFORMATIONTHEORYPrecodingChannel capacityStochastic modelsCellular radio systemsMobile stationVDP::Technology: 500::Information and communication technology: 550::Telecommunication: 552Computer Science::Networking and Internet ArchitectureElectronic engineeringFadingbusinessRelay channelComputer Science::Information Theory
researchProduct

A Geometrical Three-Ring-Based Model for MIMO Mobile-to-Mobile Fading Channels in Cooperative Networks

2011

Published version of an article published in the journal: Eurasip Journal on Advances in Signal Processing. Also available from the publisher at: http://dx.doi.org/10.1155/2011/892871. OA This paper deals with the modeling and analysis of narrowband multiple-input multiple-output (MIMO) mobile-to-mobile (M2M) fading channels in relay-based cooperative networks. In the transmission links from the source mobile station to the destination mobile station via the mobile relay, non-line-of-sight (NLOS) propagation conditions are taken into account. A stochastic narrowband MIMO M2M reference channel model is derived from the geometrical three-ring scattering model, where it is assumed that an infi…

3G MIMOSpatial correlationComputer scienceMIMOlcsh:TK7800-8360TopologyCommunications systemlcsh:Telecommunicationlaw.inventionChannel capacityNarrowbandRelaylawlcsh:TK5101-6720Mobile stationVDP::Technology: 500::Information and communication technology: 550::Telecommunication: 552Computer Science::Networking and Internet ArchitectureFadingElectrical and Electronic EngineeringComputer Science::Information Theorybusiness.industrylcsh:ElectronicsHardware and ArchitectureSignal Processingmobile-to-mobile fading channels MIMO channels space-time cross-correlation functionsTelecommunicationsbusinessCommunication channelEURASIP Journal on Advances in Signal Processing
researchProduct

Personalized multimedia touristic services for hybrid broadcast/broadband mobile receivers

2010

This paper presents the topology of a multimedia tourism service that targets mobile devices equipped with broadband and either multicast or broadcast access capabilities. Multicast / Broadcast access is used to handle the delivery of multimedia data to many simultaneous users in the service area. The solution adopted is based on existing standards for mobile TV services, but introducing features that enable the provision of generic multimedia services on top of mobile hybrid broadband and broadcast networks. Furthermore, this paper shows how to use standardized interfaces originally defined for interactive mobile TV broadcasting to build personalized mobile multimedia services that do not …

Broadband networksComputer scienceMobile televisionMobile computingBroadcastingcomputer.software_genreMultimedia Broadcast Multicast ServiceMobile stationBroadbandMedia TechnologyMobile paymentMobile searchElectrical and Electronic EngineeringMultimediaMulticastbusiness.industryIMT AdvancedMobile broadbandMobile QoSDigital multimedia broadcastingMobile telephonyWeb servicebusinesscomputerMobile deviceComputer network2010 Digest of Technical Papers International Conference on Consumer Electronics (ICCE)
researchProduct

Spectrogram Analysis of Multipath Fading Channels under Variations of the Mobile Speed

2016

When modelling, analysing, and simulating mobile radio channels, it is generally assumed that the speed of the mobile station (MS) is constant. In practice, however, the mobile speed varies with time. Mobile speed variations result in nonwide- sense stationary multipath fading channels, which can be modelled by a sum-of-chirps (SOCh) processes. In this paper, we analyse the local Doppler power spectral density (PSD) of SOCh processes by using the concept of the spectrogram. The spectrogram provides an estimate of the local Doppler PSD and gives insight into how the Doppler PSD changes over time if the MS increases or decreases its speed. A closed-form solution is presented for the spectrogr…

Computer science010401 analytical chemistrySpectral density020206 networking & telecommunications02 engineering and technology01 natural sciences0104 chemical sciencesTime–frequency analysissymbols.namesakeMobile stationComputer Science::Networking and Internet Architecture0202 electrical engineering electronic engineering information engineeringsymbolsElectronic engineeringSpectrogramDoppler effectRandom variableMultipath propagationCommunication channel2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)
researchProduct

Modelling of Non-WSSUS Channels with Time-Variant Doppler and Delay Characteristics

2018

This paper deals with the modelling of non-wide-sense stationary uncorrelated scattering (non-WSSUS) channels in which the angles of arrival (AOAs), Doppler frequencies, and propagation delays vary with time. Starting from a geometrical model in which the mobile station (MS) travels along a predefined path with time-variant velocity, it is shown how the parameters of the non-WSSUS model can be computed analytically assuming that the scatterers are fixed. One of the key results of our analysis is that the time-variant Doppler frequencies and the time-variant propagation delays of WSSUS and non-WSSUS channels are connected by a fundamental relationship. Furthermore, the time-variant channel t…

Computer scienceScatteringMathematical analysis020302 automobile design & engineering020206 networking & telecommunications02 engineering and technologyPropagation delayUncorrelatedDelay spreadsymbols.namesake0203 mechanical engineeringMobile stationPath (graph theory)0202 electrical engineering electronic engineering information engineeringsymbolsWidebandDoppler effectComputer Science::Information TheoryCommunication channel2018 IEEE Seventh International Conference on Communications and Electronics (ICCE)
researchProduct

Modelling of non-stationary mobile radio channels using two-dimensional brownian motion processes

2013

The interdisciplinary idea of this paper is to employ a two-dimensional (2D) Brownian motion (BM) process to model non-stationary mobile fading channels. It is assumed that the mobile station (MS) starts moving from a fixed point along a random path in the 2D plane. We model such a moving scenario by a 2D BM process, in which the variance of the process determines the deviation of the MS from its starting point. The propagation area is modelled by a non-centred one-ring scattering model, where the local scatterers are uniformly distributed on a ring centred not necessarily on the MS. The random movement of the MS in the proposed scattering model results in local angles-of-arrival (AOAs) and…

Computer scienceStochastic processMobile stationAutocorrelationTrajectorySpectral densityFadingStatistical physicsRandom variableBrownian motionSimulation2013 International Conference on Advanced Technologies for Communications (ATC 2013)
researchProduct

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)
researchProduct

A continuous-space analytical approach for relay node placement in hybrid cellular and ad hoc networks

2009

A hybrid network is composed of a cellular component and an ad hoc component connected by a relay node, for the purpose of coverage extension and/or capacity improvement. In this paper, we analyze the capacity of such a hybrid network by employing a continuous-space analytical methodology based on circular geometry for uniformly distributed nodes. To achieve maximal overall capacity, the relay node needs to be placed in an optimum location between the base station and the mobile station located at the boundary of the hybrid network. Numerical results show that for obtaining the optimum overall capacity for the hybrid network, the placement of the relay node should be in a range which is nei…

Computer sciencebusiness.industryWireless ad hoc networkNode (networking)Mobile computinglaw.inventionBase stationChannel capacityRelaylawMobile stationComputer Science::Networking and Internet ArchitecturebusinessRelay channelComputer Science::Information TheoryComputer network2009 6th International Symposium on Wireless Communication Systems
researchProduct

Mobile Computing Environment

2002

Context-aware pervasive systemsUbiquitous computingbusiness.industryComputer scienceMobile stationMobile computingMobile searchMobile technologyMobile WebElectrical and Electronic EngineeringbusinessComputer networkAutonomic computingTelecommunications and Radio Engineering
researchProduct

Analysis of proposals to reduce SAR levels from GSM terminals

2002

Is wireless communication dangerous? In recent years some scientists and lay people have expressed alarm at the possible harm mobile phones could cause to the user's health, even cancer. Handset terminals must meet standard limits based in SAR measurements. In this paper we present several proposals to minimize SAR values computed over a numerical user's head model using absorbent materials and new generation antennas.

Engineeringbusiness.industryfungieducationBase transceiver stationHandsetlaw.inventionALARMGSMlawMobile stationWirelessGSM servicesTransceiverTelecommunicationsbusiness2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157)
researchProduct