Difference between revisions of "TEK5110/List of Questions"
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<!--- * What is polarisation? What are its types? ---> | <!--- * What is polarisation? What are its types? ---> | ||
* What is the relation between frequency and wavelength? Provide examples of typical wavelength for mobile and wireless communications. | * What is the relation between frequency and wavelength? Provide examples of typical wavelength for mobile and wireless communications. | ||
| − | * What is happening when I double the frequency, e.g. from 900 to 1800 to 2400 to 5100 MHz? | + | * What is happening when I double the frequency, e.g. from 900 to 1800 to 2400 to 5100 MHz (in terms of range and capacity)? |
* What is fading? What are the differences between fast and slow fading, and what causes the effects? | * What is fading? What are the differences between fast and slow fading, and what causes the effects? | ||
* Describe the disturbances of a radio wave due to attenuation, reflection, diffraction, scattering, and fading. What are these effects? Explain using practical examples from mobile communication environments. | * Describe the disturbances of a radio wave due to attenuation, reflection, diffraction, scattering, and fading. What are these effects? Explain using practical examples from mobile communication environments. | ||
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Digital Communication and Communication Systems AA2, A2-A4, B1-C3 | Digital Communication and Communication Systems AA2, A2-A4, B1-C3 | ||
| − | * Looking into range, how do we classify wireless systems? Give examples. How can we extend the | + | * Looking into range, how do we classify wireless systems? Give examples. How can we extend the range (how can we reach longer)? |
* What effect does the signal to noise ratio has on wireless communications? | * What effect does the signal to noise ratio has on wireless communications? | ||
| − | * What are the factors for influencing the capacity of a system? Which factor dominates? | + | * What are the factors for influencing the capacity of a system? Which factor dominates? |
* What are the core characteristics of mobile communication systems (1G-5G)? | * What are the core characteristics of mobile communication systems (1G-5G)? | ||
* What is the relation between dB and dBm? | * What is the relation between dB and dBm? | ||
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* What are the bandwidth of typical mobile and wireless systems? Provide examples. | * What are the bandwidth of typical mobile and wireless systems? Provide examples. | ||
* What is a MIMO system and how does it enhance the capacity of a communication? | * What is a MIMO system and how does it enhance the capacity of a communication? | ||
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= Information = | = Information = | ||
* Compendium [[Building_Mobile_and_Wireless_Networks_Compendium]] | * Compendium [[Building_Mobile_and_Wireless_Networks_Compendium]] | ||
* Slides presented in the [[TEK5110]] lectures | * Slides presented in the [[TEK5110]] lectures | ||
Revision as of 13:08, 23 October 2018
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(back to TEK5110)
Radio communications and antennas (related to A1)
- What two functions are performed by antenna?
- What is an isotropic antenna? What factors determine antenna gain?
- What is meant by radiation pattern?
- What is the relation between frequency and wavelength? Provide examples of typical wavelength for mobile and wireless communications.
- What is happening when I double the frequency, e.g. from 900 to 1800 to 2400 to 5100 MHz (in terms of range and capacity)?
- What is fading? What are the differences between fast and slow fading, and what causes the effects?
- Describe the disturbances of a radio wave due to attenuation, reflection, diffraction, scattering, and fading. What are these effects? Explain using practical examples from mobile communication environments.
- How is diffraction and NLOS used for radio communications?
- What is an impuls response in mobile communications? Which are the two factors describing it?
- What is the difference between rural communications and urban communications?
Digital Communication and Communication Systems AA2, A2-A4, B1-C3
- Looking into range, how do we classify wireless systems? Give examples. How can we extend the range (how can we reach longer)?
- What effect does the signal to noise ratio has on wireless communications?
- What are the factors for influencing the capacity of a system? Which factor dominates?
- What are the core characteristics of mobile communication systems (1G-5G)?
- What is the relation between dB and dBm?
- What is the free space propagation equation? How does real world propagation change the propagation equation?
- What do we mean by indoor, pedestrian and vehicular environments? Where are they used?
- Why do higher modulation schemes need a better signal to noise ratio?
- What are the bandwidth of typical mobile and wireless systems? Provide examples.
- What is a MIMO system and how does it enhance the capacity of a communication?
Information
- Compendium Building_Mobile_and_Wireless_Networks_Compendium
- Slides presented in the TEK5110 lectures
