Difference between revisions of "B4-Attenuation and Scattering"
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Hydra pass loss approximation<br/> | Hydra pass loss approximation<br/> | ||
− | <span style="font-size: | + | <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
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. |
⌘Attenuation parameters for 2.4 GHz
Obstacle | Attenuation [dB] | |
---|---|---|
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