Difference between revisions of "B3-Multipath Propagation"
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− | ==⌘Multipath and how to use it | + | =⌘ B3-Multipath Propagation = |
+ | {{Building Networks TOC}} | ||
+ | =⌘Multipath and how to use it= | ||
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|[[File:5-10.jpg|400px|Multipath propagation]] | |[[File:5-10.jpg|400px|Multipath propagation]] | ||
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#) Multiple-input, multiple-output antenna systems (MIMO) | #) Multiple-input, multiple-output antenna systems (MIMO) | ||
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+ | ''Note:'' The mobile phone users will typically not have a direct link between the mobile phone and the antennas of the base station in a typical environment. Such a situation, where the mobile communication has to go "around a building" or "around the corner" are called '''NLOS''', non Line-of-Sight connection. As compared to a Line-of-Sight '''LOS''' connection the signal is typically reduced by some 20-30 dB. | ||
+ | |||
+ | =⌘ Boundary conditions = | ||
+ | * What is happening on electrical walls, magnetic walls? | ||
+ | |||
+ | [[File:DirectReflectedWave.png|450px|right|Figure: Reflection of an electromagnetic wave at the ground plane]] | ||
+ | |||
+ | Scattering, reflection and diffraction (<span style="color:#000B80">explain differences</span>) are the three major components in wave propagation. Ideal reflection environments are characterised through <math> |r| =1,\ \ \phi_r=180\deg </math> | ||
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===⌘Comments=== | ===⌘Comments=== | ||
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Free Space impedance <math>Z_0 </math> as connection of permeability <math>\mu_0</math> and permittivity <math>\varepsilon_0</math>. | Free Space impedance <math>Z_0 </math> as connection of permeability <math>\mu_0</math> and permittivity <math>\varepsilon_0</math>. | ||
− | <math> \mu_0=4 \pi \cdot \10^{-7} N/A^2</math>. The unit of <math>\mu_0</math> is <math>Newton/Ampere^2 N/A^2 = kg m/s^2 1/A^2</math> | + | <math> \mu_0=4 \pi \cdot \10^{-7} N/A^2</math>. The unit of <math>\mu_0</math> is <math>Newton/Ampere^2 = N/A^2 = kg m/s^2 1/A^2</math> |
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+ | <math>\varepsilon_0=\frac{1}{\mu_0 c^2} </math> <br/> | ||
+ | <math> = 8.854 \cdot \10^{-12} F/m</math>. | ||
+ | |||
+ | The unit of <math>\varepsilon_0</math> is Farad/m: <math>F/m = A s/V = A^2 s^4/(kg m^2)</math> | ||
+ | |||
+ | = Diffraction = | ||
+ | Diffraction is the transforming of a wave at an object, typical edge of a house ("edge diffraction") or the roof-top | ||
− | + | = Scattering = | |
+ | Interaction with object being about the same size as the wavelength, <math> lambda... </math> |
Latest revision as of 10:34, 17 October 2016
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Contents
⌘ B3-Multipath Propagation
⌘Multipath and how to use it
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Multipath propagation can be used through
|
Note: The mobile phone users will typically not have a direct link between the mobile phone and the antennas of the base station in a typical environment. Such a situation, where the mobile communication has to go "around a building" or "around the corner" are called NLOS, non Line-of-Sight connection. As compared to a Line-of-Sight LOS connection the signal is typically reduced by some 20-30 dB.
⌘ Boundary conditions
- What is happening on electrical walls, magnetic walls?
Scattering, reflection and diffraction (explain differences) are the three major components in wave propagation. Ideal reflection environments are characterised through
⌘Comments
⌘ Reflection
Related physics
Free Space impedance as connection of permeability
and permittivity
.
. The unit of
is
.
The unit of is Farad/m:
Diffraction
Diffraction is the transforming of a wave at an object, typical edge of a house ("edge diffraction") or the roof-top
Scattering
Interaction with object being about the same size as the wavelength,