Chapter 3

1:

RF signals offer relatively short range as compared to light signals. True or false?

A1:

Answer: False.

2:

What type of weather impacts RF signals the most?

A2:

Answer: Heavy rain.

3:

Why does interference cause errors in wireless networks?

A3:

Answer: The interference causes the receiver to misunderstand the signal because two signals are present at the same time.

4:

What are sources of RF interference?

A4:

Answer: General examples include cordless phones, microwave ovens, and Bluetooth devices.

5:

Multipath affects higher data rates more than lower data rates for 2.4 GHz systems. True or false?

A5:

Answer: True. The receiver has difficulties with differentiating one bit from another when demodulating high data rate signals because the bits are close together.

6:

What is meant by a diffused infrared light system?

A6:

Answer: A system that emits light in all directions that reflects off of the ceiling and walls.

7:

Approximately up to what range do direct infrared systems operate?

A7:

Answer: 1 mile.

8:

How does modulation make it possible to transmit information through the air?

A8:

Answer: Modulation superimposes an information signal onto a carrier signal that has a frequency suitable for propagating through the air.

9:

What attributes of a signal does QAM change in order to represent information?

A9:

Answer: Amplitude and phase.

10:

Spread spectrum generally requires user licenses. True or false?

A10:

Answer: False.



     
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