Flashcards for NM

1
Q

What is the most detrimental wireless channel impairment in LAN?

WAN?

Hilly region?
Indoor environment?

A
  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.
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2
Q

Which coding rate is least beneficial

1
1/3
1/2

A

1, as we add no redundancy

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3
Q

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

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

Cellular BS - generally cabled

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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

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5
Q

Name the three covered schedulers

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