Difference between revisions of "B4-Attenuation and Scattering"
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== ⌘ Path loss calculation == | == ⌘ Path loss calculation == | ||
[[File:TableWirelessISM.png|400px|right]] | [[File:TableWirelessISM.png|400px|right]] | ||
| − | Hydra pass loss approximation | + | Hydra pass loss approximation<br/> |
| − | <math> L = 92,4 + 20 \log(d \mathrm{[km]}) + 20 \log(f \mathrm{[GHz]}) + \sum{n_i \alpha_i}</math> | + | <span style="font-size: 140%;"><math> L = 92,4 + 20 \log(d \mathrm{[km]}) + 20 \log(f \mathrm{[GHz]}) + \sum{n_i \alpha_i}</math></span> |
* <span style="color:#000B80">relation between fading margin and receiver sensitivity</span> | * <span style="color:#000B80">relation between fading margin and receiver sensitivity</span> | ||
Latest revision as of 14:20, 26 September 2017
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Contents
⌘ Interaction of electromagnetic waves with the Environment
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Interaction with a natural target, here: a tree. The tree will interact with the electromagnetic wave both when it comes to thickness of objects and dimension of objects. Thickness typically influences attenuation, while the dimension of the object contributes to the reflection. |
Examples are:
- leaves will mainly interact around 6 Unik/GHz: thickness will attenuate, whereas reflection is due to diameter of leaves
- branches will have main interaction at about 1 Unik/GHz
- the tree trunk will interact with almost all frequencies at 30 Unik/MHz and above.
⌘ Attenuation in walls
| Attenuation in material follows typical an exponential behaviour. | 
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⌘Attenuation parameters for 2.4 GHz
| Obstacle | Attenuation |
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|---|---|---|
| Brick wall with window | 2 | |
| Brick wall next to metal door | 3 | |
| Cinder Block wall | 4 | |
| Office wall | 6 | |
| Metal door in office wall | 6 | |
| Metall door in brick wall | 12.4 | |
| Floor | 30 |
Measurements performed for European building
(Source:Hydra Deliverable D5.4, p 12)
⌘ Path loss calculation
Hydra pass loss approximation
- relation between fading margin and receiver sensitivity
