Difference between revisions of "B3-Multipath Propagation"
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* Rake receiver, where each finger of the receiver points to one reflection (typical enhanced GSM, UMTS) | * Rake receiver, where each finger of the receiver points to one reflection (typical enhanced GSM, UMTS) | ||
* MIMO (Multiple input, multiple output) or smart antenna arrays. Here we use spatial filtering, assuming that radiation comes in from different directions (typical 802.11n, smart antennas for UMTS) | * MIMO (Multiple input, multiple output) or smart antenna arrays. Here we use spatial filtering, assuming that radiation comes in from different directions (typical 802.11n, smart antennas for UMTS) | ||
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| + | ==⌘ Reflection == | ||
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| + | |Reflection at a perfectly plane gives a reflection coefficient '' r= -1''. When the surface gets rougher, reflection is still in the main direction, but the reflected power is spread around the main reflection angle. Assuming that no absorption takes place, then the total reflected power is constant. | ||
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| + | When the surface becomes extremely rough, and with roughness ''>> lambda'', then the reflected wave will be scattered into any direction. | ||
| + | |[[File:ReflectionScattering.png|450px]] | ||
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Revision as of 20:54, 20 September 2014
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⌘Multipath and how to use it
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Multipath propagation can be used through
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⌘Comments
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Receiver characteristics for usage of reflections in impulse response
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⌘ Reflection
| Reflection at a perfectly plane gives a reflection coefficient r= -1. When the surface gets rougher, reflection is still in the main direction, but the reflected power is spread around the main reflection angle. Assuming that no absorption takes place, then the total reflected power is constant.
When the surface becomes extremely rough, and with roughness >> lambda, then the reflected wave will be scattered into any direction. |
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