The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Medimos as características de propagação sem linha de visão (NLOS) de frequências de micro-ondas em um ambiente urbano com uma antena de estação base situada bem acima dos edifícios circundantes. Quando essas características são comparadas com os resultados de medições feitas no mesmo ambiente com uma altura de antena de estação base baixa, pode-se observar que com uma altura de antena de estação base baixa o coeficiente de atenuação varia muito entre a linha de visão (LOS) e Ambientes NLOS, enquanto que com uma altura de antena de estação base elevada não há variação deste tipo. Isso ocorre porque as ondas que chegam aos ambientes NLOS de uma antena alta da estação base o fazem principalmente como resultado da difração no telhado, e a perda de caminho não varia muito em regiões de igual distância entre a estação base e a estação móvel. Confirmamos que as características de frequência de perda relativa em ambientes NLOS com alta altura de antena seguem uma relação de 22.8 log f, que é mais ou menos igual à característica da banda UHF. Ao modificar os termos de frequência do modelo Sakagami (usado para a banda UHF) com base nesta tendência para permitir que ele lide com frequências de microondas, observa-se uma estreita correspondência entre os resultados das medições reais e os valores previstos pelo modelo estendido.
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Kozo SAKAWA, Hironari MASUI, Masanori ISHII, Hiroyuki SHIMIZU, Takehiko KOBAYASHI, "Non Line-of-Sight Microwave Propagation Characterization for Personal Communications with High-Tier Base Station Antenna" in IEICE TRANSACTIONS on Fundamentals,
vol. E85-A, no. 7, pp. 1569-1577, July 2002, doi: .
Abstract: We have measured the non line-of-sight (NLOS) propagation characteristics of microwave frequencies in an urban environment with a base station antenna situated well above the surrounding buildings. When these characteristics are compared with the results of measurements made in the same environment with a low base station antenna height, it can be seen that with a low base station antenna height the attenuation coefficient varies greatly between line-of-sight (LOS) and NLOS environments, whereas with a high base station antenna height there is no variation of this sort. This is because the waves arriving NLOS environments from a high base station antenna do so primarily as a result of rooftop diffraction, and the path loss does not vary much over regions of equal distance between the base station and mobile station. We have confirmed that the frequency characteristics of relative loss in NLOS environments with a high antenna height follow a relationship of 22.8 log f, which is more or less the same as the characteristic for the UHF band. By modifying the frequency terms of the Sakagami model (used for UHF band) based on this trend to allow it to handle microwave frequencies, a close correspondence is seen between the results of actual measurements and the values predicted by the extended model.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e85-a_7_1569/_p
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@ARTICLE{e85-a_7_1569,
author={Kozo SAKAWA, Hironari MASUI, Masanori ISHII, Hiroyuki SHIMIZU, Takehiko KOBAYASHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Non Line-of-Sight Microwave Propagation Characterization for Personal Communications with High-Tier Base Station Antenna},
year={2002},
volume={E85-A},
number={7},
pages={1569-1577},
abstract={We have measured the non line-of-sight (NLOS) propagation characteristics of microwave frequencies in an urban environment with a base station antenna situated well above the surrounding buildings. When these characteristics are compared with the results of measurements made in the same environment with a low base station antenna height, it can be seen that with a low base station antenna height the attenuation coefficient varies greatly between line-of-sight (LOS) and NLOS environments, whereas with a high base station antenna height there is no variation of this sort. This is because the waves arriving NLOS environments from a high base station antenna do so primarily as a result of rooftop diffraction, and the path loss does not vary much over regions of equal distance between the base station and mobile station. We have confirmed that the frequency characteristics of relative loss in NLOS environments with a high antenna height follow a relationship of 22.8 log f, which is more or less the same as the characteristic for the UHF band. By modifying the frequency terms of the Sakagami model (used for UHF band) based on this trend to allow it to handle microwave frequencies, a close correspondence is seen between the results of actual measurements and the values predicted by the extended model.},
keywords={},
doi={},
ISSN={},
month={July},}
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TY - JOUR
TI - Non Line-of-Sight Microwave Propagation Characterization for Personal Communications with High-Tier Base Station Antenna
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1569
EP - 1577
AU - Kozo SAKAWA
AU - Hironari MASUI
AU - Masanori ISHII
AU - Hiroyuki SHIMIZU
AU - Takehiko KOBAYASHI
PY - 2002
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E85-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 2002
AB - We have measured the non line-of-sight (NLOS) propagation characteristics of microwave frequencies in an urban environment with a base station antenna situated well above the surrounding buildings. When these characteristics are compared with the results of measurements made in the same environment with a low base station antenna height, it can be seen that with a low base station antenna height the attenuation coefficient varies greatly between line-of-sight (LOS) and NLOS environments, whereas with a high base station antenna height there is no variation of this sort. This is because the waves arriving NLOS environments from a high base station antenna do so primarily as a result of rooftop diffraction, and the path loss does not vary much over regions of equal distance between the base station and mobile station. We have confirmed that the frequency characteristics of relative loss in NLOS environments with a high antenna height follow a relationship of 22.8 log f, which is more or less the same as the characteristic for the UHF band. By modifying the frequency terms of the Sakagami model (used for UHF band) based on this trend to allow it to handle microwave frequencies, a close correspondence is seen between the results of actual measurements and the values predicted by the extended model.
ER -