Difference between revisions of "B4-Attenuation and Scattering"
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+ | == ⌘Attenuation parameters for 2.4 GHz == | ||
+ | || Obstacle ||Attenuation <math>\fs3 \alpha_i </math> [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 == | ||
+ | [[File:TableWirelessISM.png|400px|right]] | ||
+ | Hydra pass loss approximation | ||
+ | <math>\fs5 L = 92,4 + 20 \log(d \mathrm{[km]}) + 20 \log(f \mathrm{[GHz]}) + \sum{n_i \alpha_i}</math> | ||
+ | |||
+ | * <span style="color:#000B80">relation between fading margin and receiver sensitivity</span> | ||
+ | |||
+ | |||
+ | [[File:PathLossHydra.png|650px]] |
Revision as of 09:38, 21 September 2014
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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