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All Outputs (38)

Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links (2013)
Journal Article
Karadimas, P., Allen, B., & Smith, P. (2013). Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links. IEEE Antennas and Wireless Propagation Letters, 12, 1650-1653. https://doi.org/10.1109/lawp.2013.2294563

We statistically characterize received signal power variations in the time domain caused by human activity affecting 60-GHz indoor short-range wireless links. Our approach is based on propagation measurements in indoor environments considering human... Read More about Human Body Shadowing Characterization for 60-GHz Indoor Short-Range Wireless Links.

A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization (2012)
Conference Proceeding
Karadimas, P., & Zhang, J. (2012). A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization. In 2012 IEEE Vehicular Technology Conference (VTC Fall). https://doi.org/10.1109/vtcfall.2012.6399311

In a recent paper [1], we presented a generalized theoretical analysis for the diffuse multipath power in mobile wireless channels accounting for three-dimensional (3-D) multi-modal (i.e., clustered) scattering. In this paper, a parameterized case-st... Read More about A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part II: Second-Order Statistical Characterization.

60 GHz time-domain propagation measurement system (2012)
Conference Proceeding
Karadimas, P., Allen, B., & Okon, E. (2012). 60 GHz time-domain propagation measurement system. In 2012 Loughborough Antennas & Propagation Conference (LAPC). https://doi.org/10.1109/lapc.2012.6403041

We present a measurement system and method for characterising the 60 GHz time-domain wireless propagation channel using commercially available and cost effective equipment. Our measurements campaign focuses on characterizing shadowing attenuation due... Read More about 60 GHz time-domain propagation measurement system.

Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz (2012)
Conference Proceeding
Fang, C., Allen, B., Liu, E., Karadimas, P., Zhang, J., Glazunov, A. A., & Tufvesson, F. (2012). Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz. In 2012 Loughborough Antennas & Propagation Conference (LAPC). https://doi.org/10.1109/lapc.2012.6403064

This paper presents delay spread, coherence bandwidth, and angle-of-arrival statistics derived from an extensive MIMO channel measurement campaign carried out at a central frequency of 2.6GHz. The measurement scenarios include indoor-indoor, indoor-o... Read More about Indoor-indoor and indoor-outdoor propagation trial results at 2.6 GHz.

Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining (2011)
Journal Article
Papamichael, V. C., & Karadimas, P. (2011). Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining. IEEE Antennas and Wireless Propagation Letters, 10, 690-692. https://doi.org/10.1109/lawp.2011.2161662

In this letter, the performance of actual multielement antenna (MEA) systems under the transmit antenna selection/maximal ratio combining (TAS/MRC) technique is evaluated. An alternative version of an efficient, recently developed, stochastic electro... Read More about Performance Evaluation of Actual Multielement Antenna Systems Under Transmit Antenna Selection/Maximal Ratio Combining.

A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory (2011)
Conference Proceeding
Karadimas, P., & Zhang, J. (2011). A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory. In 2011 IEEE 73rd Vehicular Technology Conference (VTC Spring). https://doi.org/10.1109/vetecs.2011.5956137

In this paper, we present a generalized theoretical analysis for multipath scattering in mobile wireless channels where scattered power arrives into three dimensions (3-D). Moreover, multipath power can arrive into any arbitrary number of discrete an... Read More about A Generalized Analysis of Three-Dimensional Anisotropic Scattering in Mobile Wireless Channels-Part I: Theory.

Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering (2011)
Conference Proceeding
Karadimas, P., & Zhang, J. (2011). Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering. In PIERS 2011 in Marrakesh Proceedings (613-617)

In this paper, we present a generalized theoretical model for the angle of arrival (AOA) in wireless channels when the scattering is two-dimensional (2-D) anisotropic. This model can constitute a platform for creating new angular distributions for th... Read More about Angle of Arrival and Doppler Spectrum in the Presence of Generalized Two-dimensional Anisotropic Scattering.

On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels (2010)
Journal Article
Karadimas, P., Vagenas, E. D., & Kotsopoulos, S. A. (2010). On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels. IEEE Transactions on Wireless Communications, 9(7), 2119-2124. https://doi.org/10.1109/twc.2010.07.080874

In this paper, we study the temporal behavior of narrowband fixed outdoor wireless channels by modeling the impact of scatterers' mobility on the second order statistics of such channels. We show that the Nakagami-m, gamma, Weibull and lognormal prob... Read More about On the Scatterers' Mobility and Second Order Statistics of Narrowband Fixed Outdoor Wireless Channels.

Stochastic Modeling of Narrowband Fading Channels with Three Dimensional Diffuse Scattering (2009)
Book Chapter
Karadimas, P. (2009). Stochastic Modeling of Narrowband Fading Channels with Three Dimensional Diffuse Scattering. In S. Kotsopoulos, & K. Ioannou (Eds.), Handbook of Research on Heterogeneous Next Generation Networking: Innovations and Platforms (361-381). IGI Global. https://doi.org/10.4018/978-1-60566-108-7.ch016

This chapter studies a composite stochastic model, in which the diffuse component arises from three dimensional (3-D) multipath scattering. That case occurs especially in dense scattering environments, in which the tall obstacles cause arrival of mul... Read More about Stochastic Modeling of Narrowband Fading Channels with Three Dimensional Diffuse Scattering.

Στατιστική διερεύνηση της διάδοσης της σκεδαζόμενης ισχύος και του λαμβανομένου σήματος σε χρονικά μεταβαλλόμενα ασύρματα κανάλια (2009)
Thesis
Καραδήμας, Π. (2009). Στατιστική διερεύνηση της διάδοσης της σκεδαζόμενης ισχύος και του λαμβανομένου σήματος σε χρονικά μεταβαλλόμενα ασύρματα κανάλια. (Dissertation). University of Patras, Greece. Retrieved from http://researchrepository.napier.ac.uk/Output/2997159

Το αντικείμενο της παρούσης διατριβής είναι η μοντελοποίηση με χρήση στοχαστικών διαδικασιών, ασυρμάτων μη επιλεκτικών στη συχνότητα καναλιών με διαλείψεις (frequency non-selective fading channels). Η γνώση και μοντελοποίηση των χρονικών μεταβολών τω... Read More about Στατιστική διερεύνηση της διάδοσης της σκεδαζόμενης ισχύος και του λαμβανομένου σήματος σε χρονικά μεταβαλλόμενα ασύρματα κανάλια.

Ergodic Capacity for the SIMO Nakagami- Channel (2009)
Journal Article
Vagenas, E. D., Karadimas, P., & Kotsopoulos, S. A. (2009). Ergodic Capacity for the SIMO Nakagami- Channel. EURASIP Journal on Wireless Communications and Networking, 2009(1), Article 802067. https://doi.org/10.1155/2009/802067

This paper presents closed-form expressions for the ergodic channel capacity of SIMO (single-input and multiple output) wireless systems operating in a Nakagami- fading channel. As the performance of SIMO channel is closely related to the diversity c... Read More about Ergodic Capacity for the SIMO Nakagami- Channel.

A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation (2009)
Journal Article
Karadimas, P., & Kotsopoulos, S. A. (2010). A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation. Wireless Personal Communications, 53(4), 503-528. https://doi.org/10.1007/s11277-009-9698-z

This paper presents a novel mobile fading channel model, belonging to the class of Loo models, in which the multipath power arrives both in three dimensions (3-D) and in two angular sectors at the azimuth receiver’s plane. Moreover shadowing affects... Read More about A Modified Loo Model with Partially Blocked and Three Dimensional Multipath Scattering: Analysis, Simulation and Validation.

Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel (2008)
Conference Proceeding
Vagenas, E. D., Karadimas, P., & Kotsopoulos, S. A. (2008). Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel. In 2008 IEEE Globecom Workshops. https://doi.org/10.1109/glocomw.2008.ecp.97

This paper presents simple closed-form expressions for the ergodic channel capacity of SIMO (single-input and multiple output) wireless systems operating in a Nakagami fading channel. As the performance of SIMO channel is closely related to the diver... Read More about Simple Closed-Form Channel Capacity Formulas for the SIMO Nakagami Channel.

The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation (2008)
Journal Article
Karadimas, P., & Kotsopoulos, S. (2009). The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation. IEEE Transactions on Vehicular Technology, 58(7), 3808-3813. https://doi.org/10.1109/tvt.2008.2002697

In frequency-nonselective fading channels, the partial waves arriving at the mobile receiver cannot explicitly be of homogeneous nature due to nonuniform scattering caused by objects of specific reflective nature. Moreover, shadowing influences the r... Read More about The Weibull–Lognormal Fading Channel: Analysis, Simulation, and Validation.

A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component (2008)
Journal Article
Karadimas, P., & Kotsopoulos, S. A. (2008). A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component. Wireless Personal Communications, 47(4), 449-469. https://doi.org/10.1007/s11277-008-9493-2

This paper presents a mixture stochastic process by multiplying a Weibull process with a lognormal one. The first one models the possible scattering non-uniformities of the channel, whereas the second accounts for the slow term variations of the loca... Read More about A Generalized Modified Suzuki Model with Sectored and Inhomogeneous Diffuse Scattering Component.

A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering (2008)
Conference Proceeding
Karadimas, P., Vagenas, E. D., & Kotsopoulos, S. A. (2008). A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering. In 2008 5th IEEE Consumer Communications and Networking Conference (943-947). https://doi.org/10.1109/ccnc08.2007.218

In frequency non-selective fading channels the multipath components can arrive at the mobile receiver via a three dimensional (3-D) scattering mechanism. That case occurs especially in urban environments, in which the tall buildings and other obstacl... Read More about A Small Scale Fading Model with Sectored and Three Dimensional Diffuse Scattering.