Podcast
Questions and Answers
Which mechanisms can generally be attributed to electromagnetic wave propagation?
Which mechanisms can generally be attributed to electromagnetic wave propagation?
- Scattering, absorption, and transmission
- Refraction, interference, and diffraction
- Reflection, diffraction, and scattering (correct)
- Refraction, absorption, and transmission
What happens to the strengths of electromagnetic waves as the distance between the transmitter and receiver increases?
What happens to the strengths of electromagnetic waves as the distance between the transmitter and receiver increases?
- Become unpredictable
- Remain constant
- Increase
- Decrease (correct)
In urban areas with high-rise buildings, what causes severe diffraction loss in cellular radio systems?
In urban areas with high-rise buildings, what causes severe diffraction loss in cellular radio systems?
- Presence of high-rise buildings
- Interaction between different waves
- Direct line-of-sight path between the transmitter and receiver
- Multiple reflections from various objects (correct)
What do large-scale propagation models predict for an arbitrary transmitter-receiver separation distance?
What do large-scale propagation models predict for an arbitrary transmitter-receiver separation distance?
What interaction between electromagnetic waves causes multipath fading at a specific location?
What interaction between electromagnetic waves causes multipath fading at a specific location?
Study Notes
Electromagnetic Wave Propagation
- Mechanisms attributed to electromagnetic wave propagation include:
- Reflection
- Refraction
- Diffraction
- Scattering
Attenuation of Electromagnetic Waves
- As the distance between the transmitter and receiver increases, the strengths of electromagnetic waves:
- Decrease
- Experience path loss
Diffraction Loss in Urban Areas
- In urban areas with high-rise buildings, severe diffraction loss in cellular radio systems is caused by:
- Buildings blocking the line-of-sight (LOS) path
- Waves diffracting around obstacles, resulting in signal loss
Large-Scale Propagation Models
- Large-scale propagation models predict that, for an arbitrary transmitter-receiver separation distance:
- Path loss increases with distance
- Signal strength decreases with distance
Multipath Fading
- Multipath fading at a specific location is caused by the interaction between electromagnetic waves, specifically:
- The combination of direct and indirect waves arriving at the receiver
- Interference between these waves, resulting in signal fading
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Description
Learn about the basic mechanisms of signal propagation in mobile radio systems, including path loss, multipath propagation, and the diverse mechanisms behind electromagnetic wave propagation such as reflection, diffraction, and scattering.
