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Wyszukujesz frazę "propagation path loss" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
An Empirical Propagation Model for Corridors in Office Buildings
Autorzy:
Kosz, P.
Powiązania:
https://bibliotekanauki.pl/articles/227038.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wireless systems
radio wave propagation
propagation model
propagation path loss
indoor environment
test stand
Opis:
This paper presents an empirical propagation path loss model for corridors in office buildings. The proposed model estimates changeable character of radio signal attenuation, based on a special approach as a combination of the simple free-space model with the author’s model. The measurement stand and measurement scenario are described. The propagation path loss research have been made in corridor for different frequencies in range 30 MHz to 290 MHz. A significant number of measurement results were allowed an analysis of the radio wave propagation conditions in the environment. In general, the propagation path loss increases for each measurement frequencies with length of propagation route. Based on measurement data, the new empirical propagation path loss model was developed. For this purpose, the regression analysis was made. The novelty of this model is that it could be used for estimate propagation path loss in measured environment for different radio wave frequencies. At the end, in order to justification the practical usefulness of described method for estimate a radio wave attenuation, the statistical evaluation was made. Thus, the results of the statistical analysis (ME, SEE and R2 values) are satisfactory for each measured radio wave frequency.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 5-10
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propagation Path Loss Modeling in Container Terminal Environment
Autorzy:
Katulski, R. J.
Stefański, J.
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/308910.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
path loss modeling
radio propagation
Opis:
This paper describes novel method of path loss modeling for radio communication channels in container port area. Multi-variate empirical model is presented, based on multidimensional regression analysis of real path loss measurements from container terminal environment. The measurement instruments used in propagation studies in port area are also described.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 3; 38-42
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Optimized Propagation Model based on Measurement Data for Indoor Environments
Autorzy:
Morocho-Yaguana, M.
Ludeňa-González, P.
Sandoval, F.
Poma-Vélez, B.
Erreyes-Dota, A.
Powiązania:
https://bibliotekanauki.pl/articles/308451.pdf
Data publikacji:
2018
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
indoor
ITU model
log-distance model
loss measurement
one-slope model
path loss
propagation measurements
propagation models
radio propagation
Opis:
Propagation is an essential factor ensuring good coverage of wireless communications systems. Propagation models are used to predict losses in the path between transmitter and receiver nodes. They are usually defined for general conditions. Therefore, their results are not always adapted to the behavior of real signals in a specific environment. The main goal of this work is to propose a new model adjusting the loss coefficients based on empirical data, which can be applied in an indoor university campus environment. The Oneslope, Log-distance and ITU models are described to provide a mathematical base. An extensive measurement campaign is performed based on a strict methodology considering different cases in typical indoor scenarios. New loss parameter values are defined to adjust the mathematical model to the behavior of real signals in the campus environment. The experimental results show that the model proposed offers an attenuation average error of 2.5% with respect to the losses measured. In addition, comparison of the proposed model with existing solutions shows that it decreases the average error significantly for all scenarios under evaluation.
Źródło:
Journal of Telecommunications and Information Technology; 2018, 2; 69-75
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Statistical Calibration Method of Propagation Prediction Model Based on Measurement Results
Autorzy:
Kelner, Jan M.
Kryk, Michał
Łopatka, Jerzy
Gajewski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/226022.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
calibration of propagation model
empirical measurements
path loss model
propagation
parabolic equation method
radio environment maps
Opis:
Radio environment maps (REMs) are beginning to be an integral part of modern mobile radiocommunication systems and networks, especially for ad-hoc, cognitive, and dynamic spectrum access networks. The REMs will use emerging military systems of tactical communications. The REM is a kind of database used at the stage of planning and management of the radio resources and networks, which considers the geographical features of an area, environmental propagation properties, as well as the parameters of radio network elements and available services. At the REM, for spatial management of network nodes, various methods of propagation modeling for determining the attenuation and capacity of wireless links and radio ranges are used. One method of propagation prediction is based on a numerical solution of the wave equation in a parabolic form, which allows considering, i.a., atmospheric refraction, terrain shape, and soil electrical parameters. However, the determination of a current altitudinal profile of atmospheric refraction may be a problem. If the propagation-prediction model uses a fixed refraction profile, then the calibration of this model based on empirical measurements is required. We propose a methodology for calibrating the analyzed model based on an example empirical research scenario. The paper presents descriptions of the propagation model, test-bed and scenario used in measurements, and obtained signal attenuation results, which are used for the initial calibration of the model.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 1; 11-16
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of QoS Performance Evaluation over 5G Network for Indoor Environment at millimeter wave Bands
Autorzy:
Qamar, Faizan
Hindia, Mohammad Nour
Abbas, Talib
Dimyati, Kaharudin Bin
Amiri, Iraj Sadegh
Powiązania:
https://bibliotekanauki.pl/articles/226266.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
5G
millimeter wave
CI-path loss
propagation channel
channel characterization
small cell
Opis:
One of the key advancement in next-generation 5G wireless networks is the use of high-frequency signals specifically those are in the millimeter wave (mm-wave) bands. Using mmwave frequency will allow more bandwidth resulting higher data rates as compared to the currently available network. However, several challenges are emerging (such as fading, scattering, propagation loss etc.), when we propagate the radio signal at high frequencies. Optimizing propagation parameters of the mm-wave channels system are much essential for implementing in the realworld scenario. To keep this in mind, this paper presents the potential abilities of high frequencies signals by characterizing the indoor small cell propagation channel for 28 GHz, 38 GHz, 60 GHz and 73 GHz frequency band, which is considered as the ultimate frequency choice for many of the researchers. The most potential Close-In (CI) propagation model for mm-wave frequencies is used as a Large-scale path loss model. The results have been collected concerning the capacity of users to evaluate the average user throughput, cell-edge user throughput, average cell throughput, spectral efficiency and fairness index. The statistical results proved that these mm-wave spectrum gives a sufficiently greater overall performance and are available for use in the next generation 5G mobile communication network.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 95-101
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Analysis of Empirical Radio Propagation Models in Wireless Cellular Networks
Autorzy:
Rahul, Rahul
Bansal, Bajrang
Kapoor, Rajiv
Powiązania:
https://bibliotekanauki.pl/articles/1075552.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2G
3G
4G
5G Cellular Networks
Cell Coverage
Path Loss
Radio Propagation Models
Opis:
This paper presents the performance analysis of different empirical radio propagation models used in wireless cellular networks. It particular, the parameters such as path loss and cell coverage area are studied for different cellular networks from second generation (2G) to fifth generation (5G). Accurate prediction of path loss and coverage area is highly desirable for planning of any wireless communication systems. Considering the urban terrain, the comparison is made between Hata model, Stanford University Interim (SUI) model, and modified SUI models. As a motivation for new millimeter wave (mm-wave) cellular systems, i.e., for 5G communication, the analysis is performed at 28 GHz. Considering -75 dBm as the desired minimum received power, it is observed that 2G communication (at 900 MHz using Hata model) experiences the lowest path loss and thus results into largest coverage area. The path loss is observed to be maximum for the future mm-wave systems (at 28 GHz using modified SUI model) that directly imply the smallest coverage area.
Źródło:
World Scientific News; 2019, 121; 35-41
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tłumienia łącza kierunkowego w zakresie fal milimetrowych na bazie modyfikacji modelu empirycznego
Directional link attenuation in millimeter-wave range based on empirical model modification
Autorzy:
Pawlak, Dawid
Kelner, Jan M.
Powiązania:
https://bibliotekanauki.pl/articles/24065010.pdf
Data publikacji:
2022
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
łączność bezprzewodowa
propagacja fal radiowych
modele tłumienia
wielo-eliptyczny model propagacyjny
anteny kierunkowe
kierunkowe łącze radiowe
fale milimetrowe
systemy 5G
badania symulacyjne
wireless communication
radio wave propagation
path loss model
multi-elliptical propagation model
directional antennas
directional radio link
millimeter waves
5G systems
simulation studies
Opis:
Systemy telefonii komórkowej piątej i następnych generacji będą wykorzystywały nie tylko zakresy częstotliwości poniżej 6 GHz, lecz także pasma w zakresie fal milimetrowych oraz terahercowych. Z praktycznego punktu widzenia podejście to wymaga stosowania anten kierunkowych lub systemów z formowaniem wiązki. w celu zapewnienia większej efektywności energetycznej łącza bezprzewodowego istotne jest, aby wiązki radiowe po stronie nadawczej i odbiorczej były współosiowe. Modele tłumienia są powszechnie wykorzystywane przy projektowaniu systemów i sieci łączności radiowej. należy jednak podkreślić, że w literaturze nie ma dostępnych odpowiednich metod modelowania tłumienia dla przypadków braku współosiowości wiązek antenowych. w artykule zaproponowano sposób modyfikacji modelu tłumienia bazujący na wieloeliptycznym modelu propagacyjnym. w tym celu opracowano specjalne oprogramowanie w środowisku MATLAB, które posłużyło do przeprowadzenia badań symulacyjnych. w dalszej części przedstawiono przykładowe wyniki adaptacji empirycznych modeli tłumienia w zakresie fal milimetrowych, które otrzymano, wykorzystując opracowany program.
The upcoming fifth and next generation mobile phone systems will use not only the frequency bands of sub-6 GHz but also the millimeter-wave and terahertz bands. From a practical viewpoint, this approach requires the use of directional antennas or beamforming systems. To ensure greater energy efficiency of the wireless link, the radio beams on the transmitting and receiving sides should be aligned ones. Path loss models are commonly used for designing the radio communication systems and networks. However, in the literature, there are no adequate methods of attenuation modelling available for the cases of misalignment of antenna beams. in this paper, a method of modifying the path loss model, based on a multi-elliptical propagation model, is proposed. For this purpose, dedicated software was developed in the MATLAB environment, which was used to conduct simulation tests. In the remainder of the paper, exemplary results of the adaptation of empirical path loss models in the range of millimeter-waves are presented, which were obtained using the developed program.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2022, 71, 3; 69--92
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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