Flashcards for NM

Question 1

What is the most detrimental wireless channel impairment in LAN?

WAN?

Hilly region?
Indoor environment?

Answer 1

1. Interference access points are deployed close to each other
2. Path loss, noise
3. Shadowing
4. Multipath due to many reflection of objects present in indoor environments.

Question 2

Which coding rate is least beneficial

1
1/3
1/2

Answer 2

1, as we add no redundancy

Question 3

Which of the following devices the battery lifetime is not a metric of major interest

1. Wireless sensors
2. Mobile phones
3. Cellular BS

Answer 3

Cellular BS - generally cabled

Question 4

Which of these access
techniques is the one adopted in
4th generation cellular systems
(LTE/LTE-A)?
❑ TDMA
❑ OFDMA
❑ CDMA

Answer 4

OFDMA

TDMA -> 2G
CDMA -> 3G

Question 5

Name the three covered schedulers

Answer 5

1. Max C/I -> maximises throughput
2. Round Robin -> maximises fairness
3. PF -> trade off