Search results for "Coherence bandwidth"

showing 4 items of 4 documents

A Geometry-Based Underwater Acoustic Channel Model Allowing for Sloped Ocean Bottom Conditions

2017

This paper proposes a new geometry-based channel model for shallow-water ocean environments, in which the ocean bottom can slope gently down/up. The need for developing such an underwater acoustic (UWA) channel model is driven by the fact that the standard assumption of a flat ocean bottom does not hold in many realistic scenarios. Starting from a geometrical model, we develop a stochastic channel model for wideband single-input single-output vehicle-to-vehicle UWA channels using the ray theory assuming smooth ocean surface and bottom. We investigate the effect of the ocean-bottom slope angle on the distribution of the channel envelope, instantaneous channel capacity, temporal autocorrelati…

010505 oceanographyApplied MathematicsAutocorrelation020206 networking & telecommunicationsGeometry02 engineering and technology01 natural sciencesComputer Science ApplicationsDelay spreadChannel capacity0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringWidebandUnderwaterPower delay profileGeologyCoherence bandwidthComputer Science::Information Theory0105 earth and related environmental sciencesCommunication channelIEEE Transactions on Wireless Communications
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An improved method for estimating the frequency correlation function

2012

For time-invariant frequency-selective channels, the transfer function is a superposition of waves having different propagation delays and path gains. In order to estimate the frequency correlation function (FCF) of such channels, the frequency averaging technique can be utilized. The obtained FCF can be expressed as a sum of auto-terms (ATs) and cross-terms (CTs). The ATs are caused by the autocorrelation of individual path components. The CTs are due to the cross-correlation of different path components. These CTs have no physical meaning and leads to an estimation error. We propose a new estimation method aiming to improve the estimation accuracy of the FCF of a band-limited transfer fun…

Mathematical optimizationSuperposition principleInterleavingComputer scienceBandwidth (signal processing)AutocorrelationCorrelation function (quantum field theory)Transfer functionAlgorithmCoherence bandwidth2012 IEEE Wireless Communications and Networking Conference (WCNC)
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Time dispersion characterization for UWB mobile radio channels between 3.1 and 10.6 GHz

2007

In this paper, a characterization of the UWB mobile radio channel time dispersion is presented. The results provided were obtained from a measurement campaign carried out in a typical indoor office scenario in the band from 3.1 to 10.6 GHz. Time dispersion metrics as delay spread, coherence bandwidth, delay interval and delay window, in both line-of-sight (LOS) and non-line-of-sight (NLOS) conditions are provided.

Mobile radioNon-line-of-sight propagationComputer scienceDispersion (optics)Electronic engineeringMicrowaveCoherence bandwidthMobile radio channelDelay spread2007 IEEE Antennas and Propagation Society International Symposium
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A Nonisovelocity Geometry-Based Underwater Acoustic Channel Model

2018

This paper proposes a new geometry-based shallow underwater acoustic (UWA) channel model allowing for nonisovelocity ocean conditions. The fact that the isovelocity assumption does not hold in many real-world scenarios motivates the need for developing channel models for nonisovelocity UWA propagation environments. Starting from a geometrical model, we develop a stochastic channel model for a single-input single-output (SISO) vehicle-to-vehicle UWA channel assuming that the ocean surface and bottom are rough and that the speed of sound varies with depth. The effect of the nonisovelocity condition has been assessed regarding its influence on the temporal autocorrelation function, the frequen…

010505 oceanographyComputer Networks and CommunicationsComputer scienceAutocorrelationAerospace Engineering020206 networking & telecommunicationsGeometry02 engineering and technology01 natural sciencesDelay spreadAutomotive Engineering0202 electrical engineering electronic engineering information engineeringElectrical and Electronic EngineeringUnderwaterUnderwater acousticsPower delay profileUnderwater acoustic communicationCoherence bandwidth0105 earth and related environmental sciencesCommunication channelIEEE Transactions on Vehicular Technology
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