نتایج جستجو برای: indoor radio wave propagation

تعداد نتایج: 427384  

Journal: :Journal of Atmospheric and Solar-Terrestrial Physics 2021

High frequency (HF) radio wave propagation is sensitive to ionospheric disturbances caused by space weather. Changes in conditions can be directly measured with an HF transmitter/receiver link. This paper presents data from one such link, consisting of a transmitter located Ottawa, ON, Canada, and directional receiver Alert, NU, Canada. The emits signals at 6 distinct frequencies between 5.4 14...

Journal: :CoRR 2017
Sinh Le Hong Nguyen Jonas Medbo Michael Peter Aki Karttunen Katsuyuki Haneda Aliou Bamba Raffaele D'Errico Naveed Iqbal Cheikh Diakhate Jean-Marc Conrat

This paper analyzes the frequency dependency of the radio propagation channel’s root mean square (rms) delay spread (DS), based on the multi-frequency measurement campaigns in the mmMAGIC project. The campaigns cover indoor, outdoor, and outdoor-to-indoor (O2I) scenarios and a wide frequency range from 2 to 86 GHz. Several requirements have been identified that define the parameters which need ...

Journal: :The Journal of the Institute of Television Engineers of Japan 1976

Journal: :International Journal of Antennas and Propagation 2012

Journal: :Wireless Communications and Mobile Computing 2003
Michael McGuire Konstantinos N. Plataniotis Anastasios N. Venetsanopoulos

Estimating the position of mobile terminals is an important problem for cellular networks. A low cost method of locating the mobile terminal is to use measurements of the radio path loss. The distribution of radio path loss is, unfortunately, a non-linear function of the mobile terminal location. The non-linearity results from large obstacles to radio-wave propagation such as buildings or hills...

2008
Toru Kawano Keiji Goto Toyohiko Ishihara

When the surface impedance of the earth along the propagation direction changes abruptly, the ground wave is strongly affected as it occurs when the radio wave traverses a coastline from the land to the sea [1]-[8]. In this study, we shall obtain the integral representation for the ground wave propagation over the land-to-sea mixed-path by applying the aperture field method. Then by applying th...

2005
Yoneyama Tsukasa

Starting with a brief review of millimeter wave research and development, basic concept, theory and applications of NRD-guide technology are described. A particular emphasis is placed on short distance propagation of millimeter waves such as indoor HD-TV wireless transmission and Giga-bit video downloader. It is also emphasized that NRD-guide can offer advantages of easy fabrication, low cost a...

1998
Juha Juntunen Keijo Nikoskinen Kari Heiska

Diversity reception is a widely used technique in radio communications to reduce signal fading due to complex propagation environments. Fading is caused by multipath propagation of the radio signal in complex environments, which in practice are either downtown areas in large cities or indoor environments. This presentation is focused on the design problem of an antenna array, which could be use...

1999
Gerd Wölfle Reiner Hoppe Friedrich M. Landstorfer

| Ray-optical propagation models are often used for the prediction of the field strength (and delay spread) in wireless mobile communication networks. But these models suffer from long computation times. For large areas in urban or indoor scenarios the computation times are in the range of hours which is too long for the planning of mobile radio networks. A new method for the acceleration of ra...

Journal: :Wireless Personal Communications 1999
Filippo Giannetti Marco Luise Ruggero Reggiannini

This paper intends to present a summary of the technical issues arising in the exploitation of the 60 GHz mm-wave band for mobile and personal communications. The most significant applications proposed so far are surveyed, with particular emphasis placed on recent experimentation about millimeter-wave propagation for road/railway transportation as well as indoor scenarios. As a case study, the ...

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