N. Blaunstein | Ben Gurion University of the Negev (original) (raw)

Papers by N. Blaunstein

Lecture notes in electrical engineering, 2023

Introduction to the Multipath Phenomena - Statistical Description of the Multipath Propagation Ch... more Introduction to the Multipath Phenomena - Statistical Description of the Multipath Propagation Channels. Narrowband Signal Fading in the Space and Time Domains. Wideband Signal Fading in the Time and Frequency Domains. Fading Phenomena - Path Loss Phenomenon in Various Land Environments. Distribution of Angle-of-Arrival and Time Delay Resulting by Multipath Phenomena. Signal Power Fading in Angle and Time Domains. Spectral Properties of Multipath Phenomena. Characterization and Consequences of Multipath Radio Channels - Prediction of Multipath Characteristics for Communications and Positioning. System Aspects of Multipath.

Progress In Electromagnetics Research, 2004

In this work, we summarize the existing theoretical methods based on statistical and quanty theor... more In this work, we summarize the existing theoretical methods based on statistical and quanty theory and give some non-standard mathematical approaches based on such theories to explain the principal scalar and vector electrodynamic problems for future applications to acoustic, radio and optical wave propagation in homogeneous, isotropic, anisotropic and inhomogeneous media. We show of how the statistical description of wave equations can be evaluated based on quantum field theory with presentation of Feynman's diagrams by a limited-to-zero finite set of expanded Green functions according to perturbation theory for single, double, triple, etc, scattering phenomenon. It is shown that at very short wavelengths, the Green's function is damped over a few wavelengths if the refractive index fluctuations in the medium are strong; at long wavelengths the effective phase velocity of electromagnetic waves may be increased. It is shown, that the coupling between different wave modes and the energy transfer between different wave modes, may be important, even for week random fluctuations of parameters of the medium, but it takes a very long time.

Journal of Communications and Networks, 2000

A unified three-dimension probabilistic model is presented to describe multipath phenomena in var... more A unified three-dimension probabilistic model is presented to describe multipath phenomena in various built-up areas with randomly distributed buildings placed on rough terrain. The joint information regarding angle-of-arrival and time delay spread is obtained through study of the main propagation mechanisms in urban wireless communication channels. Comparison with other models and with measurements carried out in different urban environments is presented. It is shown that in dense urban areas the distribution of the obstructions surrounding the base station and the moving vehicle, as well as the elevations of both antennas contribute to the signal power profiles in the space and time domains. Using a combination of the statistical description of the built-up terrain and the 3D deterministic approach based on Kirchhoff approximation, the effects of scattering and diffraction phenomena on signal power spatial and temporal distribution are examined.

2012 XIII International Symposium on Problems of Redundancy in Information and Control Systems, 2012

The optimization of the channel capacity in the new fourth generation (4G) wireless networks beca... more The optimization of the channel capacity in the new fourth generation (4G) wireless networks became a key issue during the last decade. In this work, the co-existence of macrocell Base Stations (MBSs) and Femtocell Access Points (FAPs) or home base stations (HBS) with shared and dedicated carrier frequency allocations is considered. The simulation framework for analysis of channel capacity improvement in complex urban environment is introduced. The analysis of heterogeneous network consisting of dedicated femtocells for home coverage in a presence of traditional macrocell pattern is presented. The advantages and drawbacks for different deployment strategies are investigated using the proposed simulation framework.

This paper presents the intensity and phase fluctuations dependence on the degree of ionospheric ... more This paper presents the intensity and phase fluctuations dependence on the degree of ionospheric plasma perturbations occur during magnetic storm based on experiments by GPS monitoring of the ionosphere. During this natural phenomenon, anomalous absorption caused by decrease of the total electronic content, and fast fading of GPS radio signals caused by generation of plasma small-scale irregularities are observed experimentally. In order to present the effect of scattering caused by plasma irregularities generated during magnetic storm, 2-D phase-screen model is introduced. A satisfactory explanation of fading phenomena observed experimentally is presented based on the corresponding theoretical framework.

IEEE Antennas and Propagation Magazine, 2004

... in different types of urban areas. We considered, for the first time, both arrays of building... more ... in different types of urban areas. We considered, for the first time, both arrays of buildings randomly distributed on the built-up terrain, and arrays of streets with a straight crossing-grid plan. The proposed multi-parametric model is a general stochastic approach, based on a ...

Depolarization of EM waves in terrestrial communication links has been poorly researched. The mai... more Depolarization of EM waves in terrestrial communication links has been poorly researched. The main source of knowledge to this field comes from Stokes parameters and various field tests results. This paper presents an innovative analytical approach to this topic, providing a sufficient way of predicting the polarization of EM waves. This can be used to reduce polarization losses in receiving antennas, hence, more effective data transmission can be achieved. This paper makes use of the waves total intensity and derives probability functions for parameters of the spatial polarization ellipse.

Information and Control Systems, 2019

Introduction: This article is based on the recent research work in the field of two subjects: sig... more Introduction: This article is based on the recent research work in the field of two subjects: signal data parameters in fiber optic communication links, and dispersive properties of optical signals caused by non-homogeneous material phenomena and multimode propagation of optical signals in such kinds of wired links.Purpose: Studying multimode dispersion by analyzing the propagation of guiding optical waves along a fiber optic cable with various refractive index profiles of the inner optical cable (core) relative to the outer cladding, as well as dispersion properties of a fiber optic cable due to inhomogeneous nature of the cladding along the cable, for two types of signal code sequences transmitted via the cable: return-to-zero and non-return-to-zero ones.Methods: Dispersion properties of multimode propagation inside a fiber optic cable are analyzed with an advanced 3D model of optical wave propagation in a given guiding structure. The effects of multimodal dispersion and material ...

SPIE Proceedings, 2006

Various experiments have been carried out recently in the Middle East urban (Beer Sheva, Israel) ... more Various experiments have been carried out recently in the Middle East urban (Beer Sheva, Israel) environment for prediction of aerosol particle concentration and size distribution. During these experiments aerosol particle concentrations for different weather conditions were measured and analyzed. New aerosol size distributions are described in this work, based on an extensive series of measurements. This measurement data show the processes of absorption and scattering by aerosol particles in urban inhomogeneous areas for rainy atmospheric conditions. Several parts of the results are compared with those obtained through measurements in different geographic and climatic environments, as well as with different aerosol distribution models. Effects of different atmospheric conditions during rain on aerosol modeling are better described in this work.

Planetary and Space Science, 1993

ABSTRACT The data of the ground optical observations of plasma cloud striation in the ionosphere ... more ABSTRACT The data of the ground optical observations of plasma cloud striation in the ionosphere are compared with the numerical model. The high spatial (50 m) and temporal (0.2 s) resolution of the observations allowed us to investigate the fine structure of the striated clouds in detail. The dynamical/structural parameters of the strata system observed are shown to be in reasonable quantitative agreement with the simulated ones. The striation process can be understood in terms of the gradient-drift instability development in the electric field strongly perturbed by the plasma cloud injection. The “stretching” criterion, necessary for the plasma cloud's striation, is obtained.

[

IEEE Antennas and Propagation Magazine, 2009

This study is related to the investigation of two popular planning tools based on different appro... more This study is related to the investigation of two popular planning tools based on different approaches. The first is a stochastic model as a combination of a statistical description of features of rough built-up terrain (with arrays of buildings inside it), and the stochastic description of radio propagation above such a terra in, accounting for multiple reflection, scattering, and diffraction. The second is a determin istic ray-tracing model using direct computations of numerous rays arriving at the receiver from each point of the obstructions placed in the terrain. Both models are used to explain the propagation phenomena occurring inside urban communication links, and to design radio maps of areas of service in the space domain , for various elevations of the base-station antenna with respect to the buildings' overlay profiles. A comparison of two such theoretical predictors is done for an experimental site in Tokyo. It is shown that both proposed predictors are in good agreement with each other. At the same time, simple engineering formulas obtained from the stochastic model, taking into account shadowing effects caused by diffraction from buildings having non-regular overlay profiles with respect to the basestation antenna's elevation, have a vivid physical and mathematical form, usually converted into the "straight line" equations obtained from the proposed stochastic model. The general trend is predicted by this stochastic model, and the deterministic ray tracing provides us with fine structures superimposed on such a trend .

Annales Geophysicae, 1995

In this study, the relationship between diffusion and the electrical conductivity tensor is inves... more In this study, the relationship between diffusion and the electrical conductivity tensor is investigated by using the real geometry of the Earth's magnetic field in the Northern Hemisphere for mid-latitudes. This relationship is derived from equation. Only in the elements of the diagonal of the tensor is an equal relationship found between the electrical conductivity called the longitudinal conductivity and the diffusion coefficient. The diagonal elements are equal to each other and do not depend on the Earth's magnetic field; however, the other elements of the tensor strongly depend on the Earth's magnetic field and they have characteristic of Bohm diffusion became a semi-empirical model (D B = (1/16)kT/eB) but they do not depend on the electrical conductivity or the classical diffusion coefficient.

2009 3rd European Conference on Antennas and Propagation, 2009

This study is related to investigation of two planning tools based on the deterministic ray traci... more This study is related to investigation of two planning tools based on the deterministic ray tracing model, as direct computations of numerous rays arriving at the receiver, and the stochastic multi-parametric model, as combination of statistical description of the built-up rough terrain, and of radio propagation accounting for multiple reflection, scattering and diffraction. Comparison between these two theoretical predictors is done for description of the total path loss pattern in urban environment and is shown that simple engineering formulas, obtained from the stochastic multi-parametric model, have vivid physical and mathematical form converted in the “straight line” equations.

Summary Splitting the antenna up into several antenna elements with a possibility of adaptively c... more Summary Splitting the antenna up into several antenna elements with a possibility of adaptively combin-ing the signals gives the well-known diversity gain, under the assumption of small correlation between the elements. The correlation depends on both the element pattern and the power distribution of the environmental spread. The diversity gain may be used on both the receiving and the transmitting side, but the highest gain is achieved when both sides are being optimized jointly. The gain is not only maximized, but there is also a diversity order of order M  N . The real benefit comes from real-izing that there are a potentially large number of parallel channels with almost the same good prop-erties. This benefit may also be realized through space-time-coding or feed-back from the receiver to the transmitter (see [34]). References 1. Rappaport T. S. Wireless Communications Principles and Practice . New York, Prentice Hall, 1996. 641 p. 2. Lee W. C. Y. Mobile Cellular Telecommunic...

2019 European Microwave Conference in Central Europe (EuMCE), 2019

In this work, we examine the positioning of any subscriber located in built-up areas with a dense... more In this work, we examine the positioning of any subscriber located in built-up areas with a dense buildings layout and their overlay profile. The positioning is evaluated for different elevations of flying platforms (e.g., drones, quadcopters, aircrafts etc.) antennas and stationary or mobile subscriber (SS or MS, respectively) antenna, located below and above the rooftops. The positioning is based on the stochastic multi-parametric approach that successfully was adapted for prediction of radio signals in the space, AOA, TOA and Doppler frequency spread domains in land-to-land communication links. We use the signal power variations and its distribution in angle-of-arrival (AOA), time-of-arrival (TOA), or time-delay (TD) and Doppler shift spread (DS) domains. On the framework of the stochastic approach, the effects of TD spread and DS on signal distortion for several moving aircrafts and several ground-located subscribers have been analyzed via some experiments carried above an airpo...

A unified three-dimension probabilistic model is presented to describe multipath phenomena in var... more A unified three-dimension probabilistic model is presented to describe multipath phenomena in various built-up areas with randomly distributed buildings placed on rough terrain. Using a combination of the statistical description of the built-up terrain and the 3D deterministic approach based on Kirchhoff approximation, the effects of scattering and diffraction phenomena on signal power spatial and temporal distribution are examined. The joint information regarding angle-of-arrival, delay and Doppler spread is obtained through study of the main propagation mechanisms in urban wireless communication channels. Comparison with other models and with measurements carried out in different urban environments is presented. It is shown that in dense urban areas the distribution of the obstructions surrounding the base station and the moving vehicle, as well as the elevations of both antennas contribute to the signal power profiles in the space, time and frequency domains.

As was discussed in previous papers, the most important aspects in distortion of bandpass signals... more As was discussed in previous papers, the most important aspects in distortion of bandpass signals, consisting the carrier signal and the baseband signal with information, are the processes that drop information due to fast and slow fading, as the sources of the multiplicative noise. All previous investigations were related mostly to terrestrial communication links, mixed residential, sub-urban, and urban. In our previous publications we analytically have obtained the time delay spread, the bandwidth of coherency, and the Doppler-shift spread, not only for the time-harmonic carrier signals, usually analyzed in the literature, but also for the bandpass signal consisting both the baseband (information) signal and the carrier time-harmonic signal. In the present work, we show that for the built-up terrain – atmosphere communication link, the same processes occur with stronger influence of the multiplicative noise on the data stream parameters due to higher Doppler effects caused by flyi...

In this work, we analyze the ways of optimization of each user's channel capacity and spectra... more In this work, we analyze the ways of optimization of each user's channel capacity and spectral efficiency in a modern hierarchy of incorporated microcell, picocell and femtocell networks. We consider the co-existence of microcell Base Stations (MBSs), Picocell (PAPs) and Femtocell Access Points (FAPs) with shared and dedicated carrier frequency allocations. The simulation framework, based on the multi-parametric stochastic model of radio propagation for various scenarios, occurring in the urban environment, is introduced for analysis of channel capacity and spectral efficiency improvements in complex urban environment taking, as a real example, the description of one of the urban tested area, consisting integrated micro/picocell and femtocell configurations. The analysis of the network consisting of dedicated and shared femtocells for home coverage in a presence of traditional microcell pattern is presented. The advantages and drawbacks for different deployment strategies are in...

2012 6th European Conference on Antennas and Propagation (EUCAP), 2012

ABSTRACT This work address the channel capacity problem which is the key issue in the new generat... more ABSTRACT This work address the channel capacity problem which is the key issue in the new generation mobile broadband network. The simulation framework for analysis of channel capacity solution based on usage of the heterogeneous networks in complex urban and indoor environment is introduced in this work. The impact of heterogeneous network on channel capacity is analyzed based on proposed simulation framework. The multi-parametric statistical channel model is used for simulation of the propagation conditions. The advantages and drawbacks for various deployment strategies of femtocells in presence of macro coverage are investigated. It is shown that shared frequency assignment with open access gives better overall channel capacity for majority of the mobile outdoor and indoor users.

Lecture notes in electrical engineering, 2023

Introduction to the Multipath Phenomena - Statistical Description of the Multipath Propagation Ch... more Introduction to the Multipath Phenomena - Statistical Description of the Multipath Propagation Channels. Narrowband Signal Fading in the Space and Time Domains. Wideband Signal Fading in the Time and Frequency Domains. Fading Phenomena - Path Loss Phenomenon in Various Land Environments. Distribution of Angle-of-Arrival and Time Delay Resulting by Multipath Phenomena. Signal Power Fading in Angle and Time Domains. Spectral Properties of Multipath Phenomena. Characterization and Consequences of Multipath Radio Channels - Prediction of Multipath Characteristics for Communications and Positioning. System Aspects of Multipath.

Progress In Electromagnetics Research, 2004

In this work, we summarize the existing theoretical methods based on statistical and quanty theor... more In this work, we summarize the existing theoretical methods based on statistical and quanty theory and give some non-standard mathematical approaches based on such theories to explain the principal scalar and vector electrodynamic problems for future applications to acoustic, radio and optical wave propagation in homogeneous, isotropic, anisotropic and inhomogeneous media. We show of how the statistical description of wave equations can be evaluated based on quantum field theory with presentation of Feynman's diagrams by a limited-to-zero finite set of expanded Green functions according to perturbation theory for single, double, triple, etc, scattering phenomenon. It is shown that at very short wavelengths, the Green's function is damped over a few wavelengths if the refractive index fluctuations in the medium are strong; at long wavelengths the effective phase velocity of electromagnetic waves may be increased. It is shown, that the coupling between different wave modes and the energy transfer between different wave modes, may be important, even for week random fluctuations of parameters of the medium, but it takes a very long time.

Journal of Communications and Networks, 2000

A unified three-dimension probabilistic model is presented to describe multipath phenomena in var... more A unified three-dimension probabilistic model is presented to describe multipath phenomena in various built-up areas with randomly distributed buildings placed on rough terrain. The joint information regarding angle-of-arrival and time delay spread is obtained through study of the main propagation mechanisms in urban wireless communication channels. Comparison with other models and with measurements carried out in different urban environments is presented. It is shown that in dense urban areas the distribution of the obstructions surrounding the base station and the moving vehicle, as well as the elevations of both antennas contribute to the signal power profiles in the space and time domains. Using a combination of the statistical description of the built-up terrain and the 3D deterministic approach based on Kirchhoff approximation, the effects of scattering and diffraction phenomena on signal power spatial and temporal distribution are examined.

2012 XIII International Symposium on Problems of Redundancy in Information and Control Systems, 2012

The optimization of the channel capacity in the new fourth generation (4G) wireless networks beca... more The optimization of the channel capacity in the new fourth generation (4G) wireless networks became a key issue during the last decade. In this work, the co-existence of macrocell Base Stations (MBSs) and Femtocell Access Points (FAPs) or home base stations (HBS) with shared and dedicated carrier frequency allocations is considered. The simulation framework for analysis of channel capacity improvement in complex urban environment is introduced. The analysis of heterogeneous network consisting of dedicated femtocells for home coverage in a presence of traditional macrocell pattern is presented. The advantages and drawbacks for different deployment strategies are investigated using the proposed simulation framework.

This paper presents the intensity and phase fluctuations dependence on the degree of ionospheric ... more This paper presents the intensity and phase fluctuations dependence on the degree of ionospheric plasma perturbations occur during magnetic storm based on experiments by GPS monitoring of the ionosphere. During this natural phenomenon, anomalous absorption caused by decrease of the total electronic content, and fast fading of GPS radio signals caused by generation of plasma small-scale irregularities are observed experimentally. In order to present the effect of scattering caused by plasma irregularities generated during magnetic storm, 2-D phase-screen model is introduced. A satisfactory explanation of fading phenomena observed experimentally is presented based on the corresponding theoretical framework.

IEEE Antennas and Propagation Magazine, 2004

... in different types of urban areas. We considered, for the first time, both arrays of building... more ... in different types of urban areas. We considered, for the first time, both arrays of buildings randomly distributed on the built-up terrain, and arrays of streets with a straight crossing-grid plan. The proposed multi-parametric model is a general stochastic approach, based on a ...

Depolarization of EM waves in terrestrial communication links has been poorly researched. The mai... more Depolarization of EM waves in terrestrial communication links has been poorly researched. The main source of knowledge to this field comes from Stokes parameters and various field tests results. This paper presents an innovative analytical approach to this topic, providing a sufficient way of predicting the polarization of EM waves. This can be used to reduce polarization losses in receiving antennas, hence, more effective data transmission can be achieved. This paper makes use of the waves total intensity and derives probability functions for parameters of the spatial polarization ellipse.

Information and Control Systems, 2019

Introduction: This article is based on the recent research work in the field of two subjects: sig... more Introduction: This article is based on the recent research work in the field of two subjects: signal data parameters in fiber optic communication links, and dispersive properties of optical signals caused by non-homogeneous material phenomena and multimode propagation of optical signals in such kinds of wired links.Purpose: Studying multimode dispersion by analyzing the propagation of guiding optical waves along a fiber optic cable with various refractive index profiles of the inner optical cable (core) relative to the outer cladding, as well as dispersion properties of a fiber optic cable due to inhomogeneous nature of the cladding along the cable, for two types of signal code sequences transmitted via the cable: return-to-zero and non-return-to-zero ones.Methods: Dispersion properties of multimode propagation inside a fiber optic cable are analyzed with an advanced 3D model of optical wave propagation in a given guiding structure. The effects of multimodal dispersion and material ...

SPIE Proceedings, 2006

Various experiments have been carried out recently in the Middle East urban (Beer Sheva, Israel) ... more Various experiments have been carried out recently in the Middle East urban (Beer Sheva, Israel) environment for prediction of aerosol particle concentration and size distribution. During these experiments aerosol particle concentrations for different weather conditions were measured and analyzed. New aerosol size distributions are described in this work, based on an extensive series of measurements. This measurement data show the processes of absorption and scattering by aerosol particles in urban inhomogeneous areas for rainy atmospheric conditions. Several parts of the results are compared with those obtained through measurements in different geographic and climatic environments, as well as with different aerosol distribution models. Effects of different atmospheric conditions during rain on aerosol modeling are better described in this work.

Planetary and Space Science, 1993

ABSTRACT The data of the ground optical observations of plasma cloud striation in the ionosphere ... more ABSTRACT The data of the ground optical observations of plasma cloud striation in the ionosphere are compared with the numerical model. The high spatial (50 m) and temporal (0.2 s) resolution of the observations allowed us to investigate the fine structure of the striated clouds in detail. The dynamical/structural parameters of the strata system observed are shown to be in reasonable quantitative agreement with the simulated ones. The striation process can be understood in terms of the gradient-drift instability development in the electric field strongly perturbed by the plasma cloud injection. The “stretching” criterion, necessary for the plasma cloud's striation, is obtained.

[

IEEE Antennas and Propagation Magazine, 2009

This study is related to the investigation of two popular planning tools based on different appro... more This study is related to the investigation of two popular planning tools based on different approaches. The first is a stochastic model as a combination of a statistical description of features of rough built-up terrain (with arrays of buildings inside it), and the stochastic description of radio propagation above such a terra in, accounting for multiple reflection, scattering, and diffraction. The second is a determin istic ray-tracing model using direct computations of numerous rays arriving at the receiver from each point of the obstructions placed in the terrain. Both models are used to explain the propagation phenomena occurring inside urban communication links, and to design radio maps of areas of service in the space domain , for various elevations of the base-station antenna with respect to the buildings' overlay profiles. A comparison of two such theoretical predictors is done for an experimental site in Tokyo. It is shown that both proposed predictors are in good agreement with each other. At the same time, simple engineering formulas obtained from the stochastic model, taking into account shadowing effects caused by diffraction from buildings having non-regular overlay profiles with respect to the basestation antenna's elevation, have a vivid physical and mathematical form, usually converted into the "straight line" equations obtained from the proposed stochastic model. The general trend is predicted by this stochastic model, and the deterministic ray tracing provides us with fine structures superimposed on such a trend .

Annales Geophysicae, 1995

In this study, the relationship between diffusion and the electrical conductivity tensor is inves... more In this study, the relationship between diffusion and the electrical conductivity tensor is investigated by using the real geometry of the Earth's magnetic field in the Northern Hemisphere for mid-latitudes. This relationship is derived from equation. Only in the elements of the diagonal of the tensor is an equal relationship found between the electrical conductivity called the longitudinal conductivity and the diffusion coefficient. The diagonal elements are equal to each other and do not depend on the Earth's magnetic field; however, the other elements of the tensor strongly depend on the Earth's magnetic field and they have characteristic of Bohm diffusion became a semi-empirical model (D B = (1/16)kT/eB) but they do not depend on the electrical conductivity or the classical diffusion coefficient.

2009 3rd European Conference on Antennas and Propagation, 2009

This study is related to investigation of two planning tools based on the deterministic ray traci... more This study is related to investigation of two planning tools based on the deterministic ray tracing model, as direct computations of numerous rays arriving at the receiver, and the stochastic multi-parametric model, as combination of statistical description of the built-up rough terrain, and of radio propagation accounting for multiple reflection, scattering and diffraction. Comparison between these two theoretical predictors is done for description of the total path loss pattern in urban environment and is shown that simple engineering formulas, obtained from the stochastic multi-parametric model, have vivid physical and mathematical form converted in the “straight line” equations.

Summary Splitting the antenna up into several antenna elements with a possibility of adaptively c... more Summary Splitting the antenna up into several antenna elements with a possibility of adaptively combin-ing the signals gives the well-known diversity gain, under the assumption of small correlation between the elements. The correlation depends on both the element pattern and the power distribution of the environmental spread. The diversity gain may be used on both the receiving and the transmitting side, but the highest gain is achieved when both sides are being optimized jointly. The gain is not only maximized, but there is also a diversity order of order M  N . The real benefit comes from real-izing that there are a potentially large number of parallel channels with almost the same good prop-erties. This benefit may also be realized through space-time-coding or feed-back from the receiver to the transmitter (see [34]). References 1. Rappaport T. S. Wireless Communications Principles and Practice . New York, Prentice Hall, 1996. 641 p. 2. Lee W. C. Y. Mobile Cellular Telecommunic...

2019 European Microwave Conference in Central Europe (EuMCE), 2019

In this work, we examine the positioning of any subscriber located in built-up areas with a dense... more In this work, we examine the positioning of any subscriber located in built-up areas with a dense buildings layout and their overlay profile. The positioning is evaluated for different elevations of flying platforms (e.g., drones, quadcopters, aircrafts etc.) antennas and stationary or mobile subscriber (SS or MS, respectively) antenna, located below and above the rooftops. The positioning is based on the stochastic multi-parametric approach that successfully was adapted for prediction of radio signals in the space, AOA, TOA and Doppler frequency spread domains in land-to-land communication links. We use the signal power variations and its distribution in angle-of-arrival (AOA), time-of-arrival (TOA), or time-delay (TD) and Doppler shift spread (DS) domains. On the framework of the stochastic approach, the effects of TD spread and DS on signal distortion for several moving aircrafts and several ground-located subscribers have been analyzed via some experiments carried above an airpo...

A unified three-dimension probabilistic model is presented to describe multipath phenomena in var... more A unified three-dimension probabilistic model is presented to describe multipath phenomena in various built-up areas with randomly distributed buildings placed on rough terrain. Using a combination of the statistical description of the built-up terrain and the 3D deterministic approach based on Kirchhoff approximation, the effects of scattering and diffraction phenomena on signal power spatial and temporal distribution are examined. The joint information regarding angle-of-arrival, delay and Doppler spread is obtained through study of the main propagation mechanisms in urban wireless communication channels. Comparison with other models and with measurements carried out in different urban environments is presented. It is shown that in dense urban areas the distribution of the obstructions surrounding the base station and the moving vehicle, as well as the elevations of both antennas contribute to the signal power profiles in the space, time and frequency domains.

As was discussed in previous papers, the most important aspects in distortion of bandpass signals... more As was discussed in previous papers, the most important aspects in distortion of bandpass signals, consisting the carrier signal and the baseband signal with information, are the processes that drop information due to fast and slow fading, as the sources of the multiplicative noise. All previous investigations were related mostly to terrestrial communication links, mixed residential, sub-urban, and urban. In our previous publications we analytically have obtained the time delay spread, the bandwidth of coherency, and the Doppler-shift spread, not only for the time-harmonic carrier signals, usually analyzed in the literature, but also for the bandpass signal consisting both the baseband (information) signal and the carrier time-harmonic signal. In the present work, we show that for the built-up terrain – atmosphere communication link, the same processes occur with stronger influence of the multiplicative noise on the data stream parameters due to higher Doppler effects caused by flyi...

In this work, we analyze the ways of optimization of each user's channel capacity and spectra... more In this work, we analyze the ways of optimization of each user's channel capacity and spectral efficiency in a modern hierarchy of incorporated microcell, picocell and femtocell networks. We consider the co-existence of microcell Base Stations (MBSs), Picocell (PAPs) and Femtocell Access Points (FAPs) with shared and dedicated carrier frequency allocations. The simulation framework, based on the multi-parametric stochastic model of radio propagation for various scenarios, occurring in the urban environment, is introduced for analysis of channel capacity and spectral efficiency improvements in complex urban environment taking, as a real example, the description of one of the urban tested area, consisting integrated micro/picocell and femtocell configurations. The analysis of the network consisting of dedicated and shared femtocells for home coverage in a presence of traditional microcell pattern is presented. The advantages and drawbacks for different deployment strategies are in...

2012 6th European Conference on Antennas and Propagation (EUCAP), 2012

ABSTRACT This work address the channel capacity problem which is the key issue in the new generat... more ABSTRACT This work address the channel capacity problem which is the key issue in the new generation mobile broadband network. The simulation framework for analysis of channel capacity solution based on usage of the heterogeneous networks in complex urban and indoor environment is introduced in this work. The impact of heterogeneous network on channel capacity is analyzed based on proposed simulation framework. The multi-parametric statistical channel model is used for simulation of the propagation conditions. The advantages and drawbacks for various deployment strategies of femtocells in presence of macro coverage are investigated. It is shown that shared frequency assignment with open access gives better overall channel capacity for majority of the mobile outdoor and indoor users.