Flashcards for NM
1
Q
What is the most detrimental wireless channel impairment in LAN?
WAN?
Hilly region?
Indoor environment?
A
- Interference access points are deployed close to each other
- Path loss, noise
- Shadowing
- Multipath due to many reflection of objects present in indoor environments.
2
Q
Which coding rate is least beneficial
1
1/3
1/2
A
1, as we add no redundancy
3
Q
Which of the following devices the battery lifetime is not a metric of major interest
- Wireless sensors
- Mobile phones
- Cellular BS
A
Cellular BS - generally cabled
4
Q
Which of these access
techniques is the one adopted in
4th generation cellular systems
(LTE/LTE-A)?
❑ TDMA
❑ OFDMA
❑ CDMA
A
OFDMA
TDMA -> 2G
CDMA -> 3G
5
Q
Name the three covered schedulers
A
- Max C/I -> maximises throughput
- Round Robin -> maximises fairness
- PF -> trade off