Difference between revisions of "B4-Attenuation and Scattering"
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== ⌘Attenuation parameters for 2.4 GHz == | == ⌘Attenuation parameters for 2.4 GHz == | ||
− | | | + | {| class="wikitable" |
− | || Brick wall with window | + | ! Obstacle |
− | || Brick wall next to metal door || 3 | | + | ! Attenuation <math> \alpha_i </math> [dB] || |
− | || Cinder Block wall || 4 | | + | |- |
− | || Office wall || 6 | | + | ||Brick wall with window || 2 |
− | || Metal door in office wall || 6 | | + | |- |
− | || Metall door in brick wall || 12.4 | | + | ||Brick wall next to metal door || 3 |
− | || Floor || 30 | + | |- |
− | + | || 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 | Measurements performed for European building | ||
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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/> |
− | + | <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
Wiki for ITS | ||||||
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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