Vahid Dehghanian

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—The combined spatial-polarization correlation function for indoor multipath environments is discussed. An analytical model based on an isotropic receiving antenna and a sphere of scatterers is developed for quantifying signal decorrelation as a function of antennas' spatial and orientation separation. A closed form expression is deduced for the combined(More)
Size and cost considerations of handheld terminals limit the use of antenna array for combating multipath fading in these applications. Recently, a synthetic array based on moving a single antenna was proposed for handheld terminals. This technique however fails to provide enough diversity gain when the channel is spatially correlated. A combination(More)
—A novel fast and accurate interpolation technique for recovering the uniformly distributed samples from the irregularly spaced samples, collected non-uniformly due to the probe position error in planar near-field antenna measurements, is presented. The technique employs Yen's interpolator and tries to make it as practical as possible for the use in(More)
In this paper we investigate the impact of user proximity to handheld antenna on the performance of RSS-based indoor positioning. A planar inverted-F antenna (PIFA) is designed for operation in 2.4 GHz and the changes in antenna characteristics due to proximity to human head are quantified using a commercial full-wave simulation software. Large variation in(More)
A novel configuration for improving the frequency tracking performance of GNSS signals in multipath environments is proposed. The proposed technique is based on combining the weakly correlated outputs of Early, Prompt and Late match filters to exploit the inherent time-delay diversity when severe multipath conditions prevail. By observing more code-phase(More)
BIOGRAPHY Negin Sokhandan is a Ph.D. student in the PLAN Group of the Department of Geomatics Engineering at the University of Calgary. She received her B.Sc. and a Master of Science degree in electrical engineering from Amirkabir University of Technology (AUT). Her research interests include the fields of GNSS signal processing, wireless communications and(More)
1 vdehghan@ucalgary.ca 2 mzaheri@ucalgary.ca 3 nielsenj@ucalgary.ca 4 lachapel@ucalgary.ca Abstract—Size and cost considerations of handheld terminals limit the use of antenna array for combating multipath fading in these applications. Recently, a synthetic array based on moving a single antenna was proposed for handheld terminals. This technique however(More)
A novel technique for synthesizing an array of antenna elements with multiple polarization characteristics based on angular movements of a single antenna is developed. The diversity performance of the synthesized antenna array is then compared to that of a single static antenna through an extensive set of measurements based on capturing the CDMA 2000(More)