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150
A measurement-based fading model for wireless personal area networks
- IEEE Trans. Wireless Commun
, 2008
"... Abstract—Personal area networks (PANs) are wireless com-munications systems with high data rates but small coverage area. PAN propagation channels differ from the well-explored propagation channels of wide-area networks due to several reasons: (i) the distances are typically very small, (ii) the ant ..."
Abstract
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Cited by 8 (1 self)
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-scale fading: body shadowing (due to the orientation of the person holding the device) and shadowing due to surrounding objects (lateral movement). We also define and parameterize a complete statistical model for all fading. Index Terms—Personal area networks, channel measurements, statistical channel model
COMPARISON OF MODEL AND PROPAGATION MEASUREMENT-BASED BER PERFORMANCE PREDICTIONS FOR RAKE RECEIVERS IN URBAN MICROCELLULAR WCDMA SYSTEMS
"... One of the WCDMA service specifications is the delivery of data rates up to 2 Mbps to a single user on a downlink channel. The transmission of such high data rates in an urban propagation environment, however, poses unique problems not encountered previously in DSSS systems intended primarily for vo ..."
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importance. In addition, when analysing the performance of Rake receivers to be used in WCDMA systems it is often assumed that resolvable multipath groups (i.e. delay line model taps) have equal average power and independent, Rayleigh fading statistics. However propagation mea-surements conducted in downtown
1A Measurement Based Shadow Fading Model for Vehicle-to-Vehicle Network Simulations
"... The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel communication protocols for vehicular ad hoc networks (VANETs). Extensive research efforts have been made to develop V2V channel models to be implemented in advanced VANET system simu ..."
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simulators for performance evaluation. The impact of shadowing caused by other vehicles has, however, largely been neglected in most of the models, as well as in the system simulations. In this paper we present a shadow fading model targeting system simulations based on real measurements performed in urban
QUANTITATIVE ANALYSIS OF SHADOW EFFECTS IN HIGH-RESOLUTION IMAGES OF URBAN AREAS
"... Shadow effects have drawn much attention by researchers with increasing use of high-resolution remote sensing images of urban areas. For correction or compensation to pixels that falling in shadow areas due to the existence of vertically standing objects such as buildings and trees, quantitative ana ..."
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-spectral (MS) images. In the case study, we use 4 m-resolution multi-spectral IKONOS image and 1 m-resolution digital surface model (DSM), which is derived from airborne laser scanning data. We predict shadow areas of a multi-spectral image by using the hillshade algorithm based on meta data of the image (sun
Stochastic Modeling and Simulation of Frequency-Correlated Wideband Fading Channels
- IEEE Transactions on Vehicular Technology
, 2007
"... Abstract—For the simulation of practical frequency-diversity wireless communication systems, such as frequency-hopping systems, multicarrier code-division multiple-access systems, and orthogonal frequency-division multiplexing systems, it is often desirable to produce multiple Rayleigh fading proces ..."
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Cited by 10 (2 self)
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. It is shown that the wideband channel simulator will be reduced to a narrowband Rayleigh fading-channel simulator by removing the frequency selectivity. Furthermore, the COST 207 typical-urban and rural-area channels are applied to evaluate the performance of the resulting wideband and narrowband channel
Performance Analysis of Polarization Receive Diversity in Correlated Rayleigh Fading Channels
- in Proc. IEEE Globecom’03 Conf
, 2003
"... The reduction in the average required transmit power in order to achieve the desired system performance is determined when using a receive antenna array employing polarization diversity as opposed to spatial diversity only. Cross-polardiscrimination (XPD) and envelope correlation are used to model t ..."
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Cited by 5 (1 self)
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at the transmitter and the receiver, and perfect fast or average power control. Based on the measurement data of XPD and envelope correlation in an urban environment, two spatially separated dual-polarized antennas are shown to outperform two spatially separated vertical antennas between 2.25-2.4 dB and 4-4.3 d
Effect of Rician fading and branch correlation on a local-mean-based Macrodiversity cellular system
- IEEE Trans. on Vehic. Technol
, 1999
"... Abstract—In a macrodiversity cellular system, switching radio links between base stations cannot be done instantaneously. Thus, branch selection is usually based on the measurement of the slowly varying local-mean power rather than the rapidly varying instantaneous signal power. In this paper, we of ..."
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Cited by 6 (0 self)
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offer an exact mathematical model to analyze the performance of a local-mean-based macrodiversity cellular system in a shadowed-Rician (desired)/shadowed-Rayleigh (interfering) channel. We investigate the impact of both fading (Rician or Rayleigh) and shadowing in terms of cochannel interference (CCI
Intercell interference measured in urban areas
- Proc. IEEE ICC ’09
, 2009
"... Abstract—We report on measurements at 2.53 GHz with 20 MHz bandwidth in two triple-sectored urban macro-cell deployments in Berlin and Dresden, Germany. These measure-ments assist the design of multiuser and cooperative transmission and detection techniques promising to reduce the interference in fu ..."
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Cited by 6 (5 self)
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predicted by the channel model, but with spacings of about 20 m the correlation significantly decreases. Index Terms—radio propagation, channel sounding, antenna arrays, RMS delay spread, cooperative communications, corre-lation measurements I.
Analysis of MIMO multi-cell correlations and other propagation issues based on urban measurements,. IST mobile summit 2005
, 2005
"... Abstract—In this paper we analyze properties of Multiple-Input Multiple-Output (MIMO) channels in urban macro-cell environments based on a narrow-band measurements campaign with simultaneous measurements from two sites. We investigate joint properties of log-fading, angle-spread, and angular propaga ..."
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Cited by 7 (3 self)
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Abstract—In this paper we analyze properties of Multiple-Input Multiple-Output (MIMO) channels in urban macro-cell environments based on a narrow-band measurements campaign with simultaneous measurements from two sites. We investigate joint properties of log-fading, angle-spread, and angular
BUILDINGS ’ MODELLING FOR DIGITAL ORTHORECTIFICATION OF URBAN AREAS IMAGES
"... Orthophoto production is one of the main photogrammetric tasks. The usage of digital photogrammetric stations allows precise orthorectification based on the pixel resolution basis. Different data sources are used for production of DEM based on survey data, contour line maps, stereo images, RADAR or ..."
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for image interpretation and restoration of objects from their stereo images. The generated model of objects in urban areas is applied for image orthorectification. The areas of buildings ’ roofs, walls, shadows and visible terrain were separated. The used vector model of buildings is projected over
Results 1 - 10
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150